Implementing the IBM Storwize V3700

An IBM Redbook Publication
IBM Redbook Form Number: SG24-8107-01
ISBN: 0738438774
ISBN: 9780738438771
Publication Date: 09-Oct-2013
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Jon Tate - Author [+1] [-1]
Saiprasad Prabhakar Parkar - Author

Abstract

Organizations of all sizes are faced with the challenge of managing massive volumes of increasingly valuable data. But storing this data can be costly, and extracting value from the data is becoming more and more difficult. IT organizations have limited resources but must stay responsive to dynamic environments and act quickly to consolidate, simplify, and optimize their IT infrastructures. The IBM® Storwize® V3700 system provides a smarter solution that is affordable, easy to use, and self-optimizing, which enables organizations to overcome these storage challenges.

Storwize V3700 delivers efficient, entry-level configurations that are specifically designed to meet the needs of small and midsize businesses. Designed to provide organizations with the ability to consolidate and share data at an affordable price, Storwize V3700 offers advanced software capabilities that are usually found in more expensive systems.

Built upon innovative IBM technology, Storwize V3700 addresses the block storage requirements of small and midsize organizations. Providing up to 240 TB of capacity packaged in a compact 2U, Storwize V3700 is designed to accommodate the most common storage network technologies to enable easy implementation and management.

This IBM Redbooks® publication is intended for pre- and post-sales technical support professionals and storage administrators.

The concepts in this book also relate to the IBM Storwize V3500.

This book was written at a software level of Version 7 Release 1.

Language

English

Table of Content

Chapter 1. Overview of the IBM Storwize V3700 system
Chapter 2. Initial configuration
Chapter 3. Graphical user interface overview
Chapter 4. Host configuration
Chapter 5. Basic volume configuration
Chapter 6. Storage migration wizard
Chapter 7. Storage pools
Chapter 8. Advanced host and volume administration
Chapter 9. Easy Tier
Chapter 10. Copy services
Chapter 11. RAS, monitoring, and troubleshooting
Appendix A. Command-line interface setup and SAN Boot
ibm.com/redbooks
Front cover
Implementing the IBM
Storwize V3700
Jon Tate
Saiprasad Prabhakar Parkar
Lee Sirett
Chris Tapsell
Paulo Tomiyoshi Takeda
Easily manage and deploy systems
with embedded GUI
Experience rapid and flexible
provisioning
Protect data with remote
mirroring


International Technical Support Organization
Implementing the IBM Storwize V3700
October 2013
SG24-8107-01

© Copyright International Business Machines Corporation 2013. All rights reserved.
Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule
Contract with IBM Corp.
Second Edition (October 2013)
This edition applies to Version 7 Release 1 of IBM Storwize V3700 machine code.
Note: Before using this information and the product it supports, read the information in “Notices” on
page ix.

© Copyright IBM Corp. 2013. All rights reserved.
iii
Contents
Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .x
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Authors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xii
Now you can become a published author, too! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Comments welcome. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Stay connected to IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Summary of changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xv
October 2013, Second Edition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xv
Chapter 1. Overview of the IBM Storwize V3700 system. . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 IBM Storwize V3700 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 IBM Storwize V3700 terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 IBM Storwize V3700 models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 IBM Storwize V3700 hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4.1 Control enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4.2 Expansion enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.4.3 Host interface cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.4.4 Disk drive types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.5 IBM Storwize V3700 terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.5.1 Hosts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.5.2 Node canister . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.5.3 I/O Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.5.4 Clustered system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.5.5 RAID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.5.6 Managed disks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.5.7 Quorum disks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.5.8 Storage pools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.5.9 Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.5.10 iSCSI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.5.11 SAS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.6 IBM Storwize V3700 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.6.1 Volume mirroring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.6.2 Thin provisioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.6.3 Easy Tier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.6.4 Turbo Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.6.5 Storage Migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.6.6 FlashCopy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.6.7 Remote Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.7 Problem management and support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.7.1 IBM Assist On-site and remote service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.7.2 Event notifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.7.3 SNMP traps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.7.4 Syslog messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.7.5 Call Home email . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.7.6 Useful IBM Storwize V3700 websites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

iv
Implementing the IBM Storwize V3700
Chapter 2. Initial configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.1 Hardware installation planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.2 SAN configuration planning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.3 SAS direct attach planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.4 LAN configuration planning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.4.1 Management IP address considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.4.2 Service IP address considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.5 Host configuration planning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.6 Miscellaneous configuration planning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.7 System management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2.7.1 Graphical user interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2.7.2 Command-line interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.8 First-time setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
2.9 Initial configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
2.9.1 Adding enclosures after initial configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
2.9.2 Configure Call Home, email alert, and inventory. . . . . . . . . . . . . . . . . . . . . . . . . . 66
2.9.3 Service Assistant tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Chapter 3. Graphical user interface overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3.1 Getting started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.1.1 Supported browsers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.1.2 Access the management GUI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.1.3 Overview panel layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
3.2 Navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
3.2.1 Function icons navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3.2.2 Extended help navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
3.2.3 Breadcrumb navigation aid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
3.2.4 Suggested Tasks aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
3.2.5 Presets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
3.2.6 Access actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
3.2.7 Task progress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
3.2.8 Navigating panels with tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
3.3 Status Indicators menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
3.3.1 Horizontal bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
3.3.2 Allocated status bar menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
3.3.3 Running tasks bar menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
3.3.4 Health status bar menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
3.4 Function Icon menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
3.4.1 Home menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
3.4.2 Monitoring menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
3.4.3 Pools menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
3.4.4 Volumes menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
3.4.5 Hosts menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
3.4.6 Copy Services menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
3.4.7 Access menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
3.4.8 Settings menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
3.5 Management GUI help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
3.5.1 IBM Storwize V3700 Information Center. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
3.5.2 Watching an e-Learning videos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
3.5.3 Learning more. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
3.5.4 Embedded panel help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
3.5.5 Hidden question mark help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
3.5.6 Hover help. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Contents
v
3.5.7 IBM endorsed YouTube videos. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Chapter 4. Host configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
4.1 Host attachment overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
4.2 Preparing the host operating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
4.2.1 Windows 2008 R2: Preparing for Fibre Channel attachment . . . . . . . . . . . . . . . 153
4.2.2 Windows 2008 R2: Preparing for iSCSI attachment. . . . . . . . . . . . . . . . . . . . . . 156
4.2.3 Windows 2008 R2: Preparing for SAS attachment. . . . . . . . . . . . . . . . . . . . . . . 161
4.2.4 VMware ESX: Preparing for Fibre Channel attachment . . . . . . . . . . . . . . . . . . . 164
4.2.5 VMware ESX: Preparing for iSCSI attachment. . . . . . . . . . . . . . . . . . . . . . . . . . 166
4.2.6 VMware ESX: Preparing for SAS attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . 174
4.3 Configuring hosts on IBM Storwize V3700 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
4.3.1 Considerations when creating hosts on IBM Storwize V3700. . . . . . . . . . . . . . . 175
4.3.2 Creating Fibre Channel hosts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
4.3.3 Creating iSCSI hosts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
4.3.4 Configuring IBM Storwize V3700 for iSCSI host connectivity. . . . . . . . . . . . . . . 183
4.3.5 Creating SAS hosts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Chapter 5. Basic volume configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
5.1 Provisioning storage from IBM Storwize V3700 and making it available to the host. . 190
5.1.1 Creating a generic volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
5.1.2 Creating a thin-provisioned volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
5.1.3 Creating a mirrored volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
5.1.4 Creating a thin-mirror volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
5.2 Mapping a volume to the host. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
5.2.1 Mapping newly created volumes to the host by using the wizard. . . . . . . . . . . . 207
5.2.2 Manually mapping a volume to the host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
5.3 Discovering the volumes from the host and specifying multipath settings . . . . . . . . . 213
5.3.1 Windows 2008 Fibre Channel volume attachment . . . . . . . . . . . . . . . . . . . . . . . 215
5.3.2 Windows 2008 iSCSI volume attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
5.3.3 Windows 2008 Direct SAS volume attachment. . . . . . . . . . . . . . . . . . . . . . . . . . 228
5.3.4 VMware ESX Fibre Channel volume attachment . . . . . . . . . . . . . . . . . . . . . . . . 232
5.3.5 VMware ESX iSCSI volume attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
5.3.6 VMware ESX Direct SAS volume attachment. . . . . . . . . . . . . . . . . . . . . . . . . . . 252
Chapter 6. Storage migration wizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
6.1 Interoperability and compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
6.2 Storage migration wizard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
6.2.1 External virtualization capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
6.2.2 Overview of the storage migration wizard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262
6.2.3 Storage migration wizard tasks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
6.3 Storage migration wizard example scenario. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
6.3.1 Storage migration wizard example scenario description. . . . . . . . . . . . . . . . . . . 276
6.3.2 Using the storage migration wizard for example scenario . . . . . . . . . . . . . . . . . 278
Chapter 7. Storage pools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
7.1 Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314
7.2 Working with internal drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
7.2.1 Internal storage window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
7.2.2 Actions on internal drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
7.3 Configuring internal storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
7.3.1 RAID configuration presets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
7.3.2 Customize initial storage configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328
7.3.3 Create new MDisk and pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

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7.3.4 Using the recommended configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330
7.3.5 Selecting a different configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
7.4 Working with MDisks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338
7.4.1 MDisk by Pools panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
7.4.2 RAID action for MDisks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
7.4.3 Other actions on MDisks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
7.5 Working with Storage Pools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348
7.5.1 Create Pool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
7.5.2 Actions on storage pools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Chapter 8. Advanced host and volume administration. . . . . . . . . . . . . . . . . . . . . . . . 353
8.1 Advanced host administration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
8.1.1 Modifying Mappings menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
8.1.2 Unmapping volumes from a host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
8.1.3 Duplicate Mappings option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363
8.1.4 Renaming a host. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
8.1.5 Deleting a host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
8.1.6 Host properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
8.2 Adding and deleting host ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
8.2.1 Adding a host port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
8.2.2 Adding a Fibre Channel port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
8.2.3 Adding a SAS host port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
8.2.4 Adding an iSCSI host port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375
8.2.5 Deleting a host port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
8.3 Host mappings overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377
8.3.1 Unmap Volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
8.3.2 Properties (Host) option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
8.3.3 Properties (Volume) option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
8.4 Advanced volume administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
8.4.1 Advanced volume functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380
8.4.2 Mapping a volume to a host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383
8.4.3 Unmapping volumes from all hosts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384
8.4.4 Viewing a host that is mapped to a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384
8.4.5 Duplicate Volume option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385
8.4.6 Renaming a volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
8.4.7 Shrinking a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
8.4.8 Expanding a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
8.4.9 Migrating a volume to another storage pool . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
8.4.10 Deleting a volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390
8.5 Volume properties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
8.5.1 Overview tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
8.5.2 Host Maps tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
8.5.3 Member MDisk tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
8.5.4 Adding a mirrored volume copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396
8.5.5 Editing Thin-Provisioned volume properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . 398
8.6 Advanced volume copy functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400
8.6.1 Thin-provisioned. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402
8.6.2 Splitting into a new volume. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402
8.6.3 Validate Volume Copies option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404
8.6.4 Delete Volume Copy option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405
8.6.5 Migrating volumes by using the volume copy features. . . . . . . . . . . . . . . . . . . . 406
8.7 Volumes by Pool feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 407
8.8 Volumes by Host feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410

Contents
vii
Chapter 9. Easy Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411
9.1 Easy Tier overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412
9.2 Easy Tier for IBM Storwize V3700 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
9.2.1 Tiered storage pools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413
9.3 Easy Tier process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414
9.3.1 I/O Monitoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
9.3.2 Data Placement Advisor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
9.3.3 Data Migration Planner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
9.3.4 Data Migrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415
9.3.5 Easy Tier operating modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416
9.3.6 Easy Tier rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417
9.4 Easy Tier configuration using the GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419
9.4.1 Creating multitiered pools: Enable Easy Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . 419
9.4.2 Downloading Easy Tier I/O measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
9.5 Easy Tier configuration using the CLI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427
9.5.1 Enabling Easy Tier evaluation mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428
9.5.2 Enabling or disabling Easy Tier on single volumes. . . . . . . . . . . . . . . . . . . . . . . 431
9.6 IBM Storage Tier Advisor Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
9.6.1 Creating graphical reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
9.6.2 STAT reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
9.7 Tivoli Storage Productivity Center. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436
9.7.1 Features of Tivoli Storage Productivity Center . . . . . . . . . . . . . . . . . . . . . . . . . . 436
9.7.2 Adding IBM Storwize V3700 in Tivoli Storage Productivity Center. . . . . . . . . . . 436
9.8 Administering and reporting an IBM Storwize V3700 system through Tivoli Storage
Productivity Center. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
9.8.1 Basic configuration and administration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439
9.8.2 Report Generation by using the GUI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
9.8.3 Report Generation using Tivoli Storage Productivity Center web page . . . . . . . 443
Chapter 10. Copy services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
10.1 FlashCopy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450
10.1.1 Business requirements for FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450
10.1.2 FlashCopy functional overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451
10.1.3 Planning for FlashCopy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459
10.1.4 Managing FlashCopy by using the GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460
10.1.5 Managing FlashCopy mappings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467
10.1.6 Managing a FlashCopy consistency group. . . . . . . . . . . . . . . . . . . . . . . . . . . . 489
10.2 Remote Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 498
10.2.1 Remote Copy license consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 498
10.2.2 Remote Copy concepts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499
10.2.3 Global Mirror with Change Volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505
10.2.4 Remote Copy planning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510
10.3 Troubleshooting Remote Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513
10.3.1 1920 error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513
10.3.2 1720 error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515
10.4 Managing Remote Copy using the GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515
10.4.1 Managing cluster partnerships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515
10.4.2 Managing stand-alone Remote Copy relationships . . . . . . . . . . . . . . . . . . . . . 520
10.4.3 Managing a Remote Copy consistency group . . . . . . . . . . . . . . . . . . . . . . . . . 531
Chapter 11. RAS, monitoring, and troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . 543
11.1 Reliability, availability, and serviceability on the IBM Storwize V3700 . . . . . . . . . . . 544
11.2 IBM Storwize V3700 components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545
11.2.1 Enclosure midplane assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 545

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11.2.2 Node canisters: Ports and LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546
11.2.3 Node canister replaceable hardware components . . . . . . . . . . . . . . . . . . . . . . 550
11.2.4 Expansion canister: Ports and LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 554
11.2.5 Disk subsystem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 555
11.2.6 Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558
11.3 Configuration backup procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 560
11.3.1 Generating a configuration backup using the CLI . . . . . . . . . . . . . . . . . . . . . . 560
11.3.2 Downloading a configuration backup using the GUI . . . . . . . . . . . . . . . . . . . . 561
11.4 Software upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 564
11.4.1 Upgrading software automatically . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 564
11.4.2 GUI upgrade process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 565
11.4.3 Upgrading software manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568
11.5 Event log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 573
11.5.1 Managing the event log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 574
11.5.2 Alert handling and recommended actions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 577
11.6 Collecting support information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585
11.6.1 Support data via GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585
11.6.2 Support information via Service Assistant . . . . . . . . . . . . . . . . . . . . . . . . . . . . 586
11.6.3 Support Information onto USB stick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 587
11.7 Powering on and shutting down IBM Storwize V3700 . . . . . . . . . . . . . . . . . . . . . . . 588
11.7.1 Shutting down the system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 588
11.7.2 Powering on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 591
Appendix A. Command-line interface setup and SAN Boot . . . . . . . . . . . . . . . . . . . . 593
Command-line interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594
Basic setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594
Example commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603
SAN Boot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 606
Enabling SAN Boot for Windows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 606
Enabling SAN Boot for VMware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 606
Windows SAN Boot migration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 607
Related publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609
IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609
IBM Storwize V3700 publications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609
IBM Storwize V3700 support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609
Help from IBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 609
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 611

© Copyright IBM Corp. 2013. All rights reserved.
ix
Notices
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x
Implementing the IBM Storwize V3700
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© Copyright IBM Corp. 2013. All rights reserved.
xi
Preface
Organizations of all sizes are faced with the challenge of managing massive volumes of
increasingly valuable data. But storing this data can be costly, and extracting value from the
data is becoming more and more difficult. IT organizations have limited resources but must
stay responsive to dynamic environments and act quickly to consolidate, simplify, and
optimize their IT infrastructures. The IBM® Storwize® V3700 system provides a smarter
solution that is affordable, easy to use, and self-optimizing, which enables organizations to
overcome these storage challenges.
Storwize V3700 delivers efficient, entry-level configurations that are specifically designed to
meet the needs of small and midsize businesses. Designed to provide organizations with the
ability to consolidate and share data at an affordable price, Storwize V3700 offers advanced
software capabilities that are usually found in more expensive systems.
Built upon innovative IBM technology, Storwize V3700 addresses the block storage
requirements of small and midsize organizations. Providing up to 240 TB of capacity
packaged in a compact 2U, Storwize V3700 is designed to accommodate the most common
storage network technologies to enable easy implementation and management.
Storwize V3700 includes the following features:
Web-based GUI provides point-and-click management capabilities.
Internal disk storage virtualization enables rapid, flexible provisioning and simple
configuration changes.
Thin provisioning enables applications to grow dynamically but only use space they
actually need.
Enables simple data migration from external storage to Storwize V3700 storage (one way
from another storage device).
Remote Mirror to create copies of data at remote locations for disaster recovery.
IBM FlashCopy® creates instant application copies for backup or application testing.
This IBM Redbooks® publication is intended for pre- and post-sales technical support
professionals and storage administrators.
The concepts in this book also relate to the IBM Storwize V3500.
This book was written at a software level of Version 7 Release 1.

xii
Implementing the IBM Storwize V3700
Authors
This book was produced by a team of specialists from around the world working at the IBM
Manchester Lab, UK.
Jon Tate is a Project Manager for IBM System Storage® SAN
Solutions at the International Technical Support Organization,
San Jose Center. Before joining the ITSO in 1999, he worked in
the IBM Technical Support Center, providing Level 2/3 support
for IBM storage products. Jon has over 27 years of experience
in storage software and management, services, and support,
and is an IBM Certified Consulting IT Specialist and an IBM
SAN Certified Specialist. He is also the UK Chairman of the
Storage Networking Industry Association.
Saiprasad Prabhakar Parkar is a senior IT Specialist for IBM
at the ISTL Pune, India. He has worked for IBM for five years
and provides Level 3 support for UNIX, IBM Power Systems,
and storage products. Sai has 10 years of experience in UNIX
and Power System and Storage. He is IBM Certified Solution
Specialist.
Lee Sirett is a Storage Technical Advisor for the European
Storage Competency Centre in Mainz, Germany. Before joining
the ESCC, he worked in IBM Technical Support Services for 10
years providing support on a range of IBM Products including
Power Systems™. Lee has 24 years experience in the IT
Industry. He is IBM Storage Certified and an IBM Certified
XIV® Administrator and Certified XIV Specialist.
Chris Tapsell is a Presales Storage Technical Specialist for
IBM Systems & Technology Group. Before his current role, in
his 25+ years at IBM, he has worked as a CE covering
products such as Golf Ball typewriters up to AS400 (System
i®), as a Support Specialist for all of the IBM Intel server
products (PC Server, Netfinity®, xSeries® & System x), PCs
and notebooks, and as a Presales Technical Specialist for
System x.
Chris holds a number of IBM Certifications covering System x
and storage products.

Preface
xiii
Thanks to the following people for their contributions to this project:
Martyn Spink
Djihed Afifi
Karl Martin
Imran Imtiaz
Doug Neil
David Turnbull
Stephen Bailey
IBM Manchester Lab
John Fairhurst
Paul Marris
Paul Merrison
IBM Hursley
Mary Connell
IBM STG
Thanks to the following authors of the previous edition of this book:
Uwe Dubberke
Justin Heather
Andrew Hickey
Imran Imtiaz
Nancy Kinney
Dieter Utesch
Now you can become a published author, too!
Here’s an opportunity to spotlight your skills, grow your career, and become a published
author—all at the same time! Join an ITSO residency project and help write a book in your
area of expertise, while honing your experience using leading-edge technologies. Your efforts
will help to increase product acceptance and customer satisfaction, as you expand your
network of technical contacts and relationships. Residencies run from two to six weeks in
length, and you can participate either in person or as a remote resident working from your
home base.
Find out more about the residency program, browse the residency index, and apply online at
this website:
http://www.ibm.com/redbooks/residencies.html
Paulo Tomiyoshi Takeda is a SAN and Storage Disk specialist
at IBM Brazil. He has over eight years of experience in the IT
arena. He holds a bachelors degree in Information Systems
from UNIFEB (Universidade da Fundação Educacional de
Barretos) and is IBM Certified for IBM DS8000® and IBM
Storwize V7000. His areas of expertise include planning,
configuring and troubleshooting DS8000, SAN Volume
Controller and IBM Storwize V7000. He is involved in
storage-related projects such as capacity growth planning,
SAN consolidation, storage microcode upgrades, and copy
services in the Open Systems environment.

xiv
Implementing the IBM Storwize V3700
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© Copyright IBM Corp. 2013. All rights reserved.
xv
Summary of changes
This section describes the technical changes made in this edition of the book and in previous
editions. This edition might also include minor corrections and editorial changes that are not
identified.
Summary of Changes
for SG24-8107-01
for Implementing the IBM Storwize V3700
as created or updated on October 9, 2013.
October 2013, Second Edition
This revision reflects the addition, deletion, or modification of new and changed information
described below.
New information
FlashCopy
Remote Mirror
Easy Tier
Changed information
Screen shots updated to 7.1
CLI command issuance and output

xvi
Implementing the IBM Storwize V3700

© Copyright IBM Corp. 2013. All rights reserved.
1
Chapter 1.
Overview of the IBM Storwize
V3700 system
This chapter provides an overview of the IBM Storwize V3700 architecture and includes a
brief explanation of storage virtualization.
This chapter includes the following topics:
IBM Storwize V3700 overview
IBM Storwize V3700 terminology
IBM Storwize V3700 models
IBM Storwize V3700 hardware
IBM Storwize V3700 terms
IBM Storwize V3700 features
Problem management and support
1

2
Implementing the IBM Storwize V3700
1.1 IBM Storwize V3700 overview
The IBM Storwize V3700 solution provides a modular storage system that includes the
capability to virtualize its own internal storage. The IBM Storwize V3700 system is a
virtualizing RAID entry storage system.
IBM Storwize V3700 features the following benefits:
Brings enterprise technology to entry storage
Speciality administrators are not required
Easy client setup and service
Ability to grow the system incrementally as storage capacity and performance needs
change
Simple integration into the server environment
The IBM Storwize V3700 addresses the block storage requirements of small and midsize
organizations and consists of one 2U control enclosure and, optionally, up to four 2U
expansion enclosures that are connected via SAS cables, which make up one system that is
called an I/O Group.
The control and expansion enclosures are available in the following factors and can be
intermixed within an I/O group:
12x 3.5" drives in a 2U unit
24x 2.5" drives in a 2U unit
Within each enclosure are two canisters. Control enclosures contain two node canisters, and
expansion enclosures contain two expansion canisters.
The IBM Storwize V3700 scales up to 60 x 3.5-inch or 120 x 2.5-inch or a combination of both
drive form factors.
Drive types supported are: The SAS, NL-SAS and solid-state drives (SSDs) are the
supported drive types.
IBM Storwize V3700 provides host attachment through 6 Gb SAS and 1 Gb iSCSI host
interfaces with optional 8 Gb Fibre Channel, 10 Gb iSCSI/Fibre Channel over Ethernet host
ports or 6 Gb SAS 4-port host interface card (HIC).
Important: IBM Storwize V3700 can be direct attached to a host. For more information
about restrictions, see the IBM System Storage Interoperation Center (SSIC) at this
website:
http://www.ibm.com/systems/support/storage/ssic/interoperability.wss
Host attachment information also is available at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/topic/com.ibm.storwize.v370
0.710.doc/svc_hostattachmentmain.html

Chapter 1. Overview of the IBM Storwize V3700 system
3
The IBM Storwize V3700 is a virtualized storage solution that groups its internal drives into
RAID arrays, which are called
Managed Disks
(MDisks). These MDisks are then grouped into
Storage Pools. Volumes are then created from these Storage Pools and provisioned out to
hosts. Storage Pools are normally created with MDisks of the same type and capacity of
drive. Volumes can be moved non-disruptively between Storage Pools with differing
performance characteristics. For example, a volume can be moved between a Storage Pool
made up of NL-SAS drives to a Storage Pool made up of SAS drives.
The IBM Storwize V3700 system also provides several configuration options that are aimed at
simplifying the implementation process. It also provides configuration presets and automated
wizards, called
Directed Maintenance Procedures
(DMP) to help resolve any events that
might occur.
IBM Storwize V3700 system provides a simple and easy to use graphical user interface (GUI)
that is designed to allow storage to be deployed quickly and efficiently. The GUI runs on any
supported browser. The management GUI contains a series of preestablished configuration
options called
presets
that use commonly used settings to quickly configure objects on the
system. Presets are available for creating volumes and IBM FlashCopy mappings and for
setting up a RAID configuration.
You can also use the command-line interface (CLI) to set up or control the system.
1.2 IBM Storwize V3700 terminology
The IBM Storwize V3700 system introduced some terminology, which is consistent with the
entire IBM Storwize family and SAN Volume Controller, as shown in Table 1-1.
Table 1-1 IBM Storwize V3700 terminology
IBM Storwize V3700 term Definition
Battery Each control enclosure node canister in a IBM Storwize V3700
contains a battery.
Canister Canisters are hardware units that are subcomponents of a IBM
Storwize V3700 enclosures. Each enclosure contains two
canisters.
Chain A set of enclosures that is attached to provide redundant
access to the drives that are inside the enclosures. Each control
enclosure has two chains.
Clone A copy of a volume on a server at a particular point. The
contents of the copy can be customized while the contents of
the original volume are preserved.
Control enclosure A hardware unit that includes the chassis, node canisters,
drives, and power sources.
Data migration By using IBM Storwize V3700, you can migrate data from
existing external storage to its internal volumes.
Drive IBM Storwize V3700 supports a range of hard disk drives
(HDDs) and solid-state drives (SSDs).
Enclosure An enclosure is the basic housing unit for the IBM Storwize
V3700. It is the rack-mounted hardware that contains all the
main components of the system: canisters, drives, and power
supplies.

4
Implementing the IBM Storwize V3700
Event An occurrence that is significant to a task or system. Events can
include completion or failure of an operation, a user action, or
the change in the state of a process.
Expansion canister A hardware unit that includes the serial-attached SCSI (SAS)
interface hardware that enables the node hardware to use the
drives of the expansion enclosure.
Expansion enclosure A hardware unit that includes expansion canisters, drives, and
power supply units.
Fibre Channel port Fibre Channel ports are connections for the hosts to get access
to the IBM Storwize V3700.
Host mapping The process of controlling which hosts can access specific
volumes within a IBM Storwize V3700.
iSCSI (Internet Small Computer
System Interface)
Internet Protocol (IP)-based storage networking standard for
linking data storage facilities.
Internal storage Array MDisks and drives that are held in enclosures and nodes
that are part of the IBM Storwize V3700.
Managed disk (MDisk) A component of a storage pool that is managed by a clustered
system. An MDisk is part of a RAID array of internal storage. An
MDisk is not visible to a host system on the storage area
network.
Node canister A hardware unit that includes the node hardware, fabric, and
service interfaces, serial-attached SCSI (SAS), expansion
ports, and battery.
PHY A single SAS lane. There are four PHYs in each SAS cable.
Power Supply Unit Each enclosure has two power supply units (PSU).
Quorum disk A disk that contains a reserved area that is used exclusively for
cluster management. The quorum disk is accessed when it is
necessary to determine which half of the cluster continues to
read and write data.
Serial-Attached SCSI (SAS) ports SAS ports are connections for the host to get direct attached
access to the IBM Storwize V3700 and expansion enclosure.
Snapshot An image backup type that consists of a point-in-time view of a
volume.
Storage pool A collection of storage capacity that provides the capacity
requirements for a volume.
Strand The SAS connectivity of a set of drives within multiple
enclosures. The enclosures can be control enclosures or
expansion enclosures.
Thin provisioning or thin
provisioned
The ability to define a storage unit (full system, storage pool, or
volume) with a logical capacity size that is larger than the
physical capacity that us assigned to that storage unit.
Turbo Performance Increases system maximum IOPS and maximum throughput.
Volume A discrete unit of storage on disk, tape, or other data recording
medium that supports some form of identifier and parameter
list, such as a volume label or input/output control.
IBM Storwize V3700 term Definition

Chapter 1. Overview of the IBM Storwize V3700 system
5
1.3 IBM Storwize V3700 models
The IBM Storwize V3700 platform consists of several different models.
The IBM Storwize V3700 models are described in Table 1-2. All models have two node
canisters. C models are control enclosures and E models are expansion enclosures.
Table 1-2 IBM Storwize V3700 models
Figure 1-1 shows the front view of the 2072-12C and 12E enclosures.
Figure 1-1 IBM Storwize V3700 front view for 2072-12C and 12E enclosures
The drives are positioned in four columns of three horizontal-mounted drive assemblies. The
drive slots are numbered 1 - 12, starting at upper left and going left to right, top to bottom.
Worldwide port names Each Fibre Channel or SAS port is identified by their physical
port number and worldwide port name (WWPN).
IBM Storwize V3700 term Definition
More information: For more information about the features, benefits, and specifications of
IBM Storwize V3700 models, see this website:
http://www.ibm.com/systems/storage/disk/storwize_v3700/overview.html
The information in this book is accurate at the time of writing. However, as the IBM
Storwize V3700 matures, expect to see new features and enhanced specifications.
Model Total System Cache Drive slots
2072-12C (with two node
canister)
8 GB upgradeable to 16 GB 12 x 3.5-inch per enclosure
2072-24C (with two node
canister)
8 GB upgradeable to 16 GB 24 x 2.5-inch per enclosure
2072-12E (one expansion
enclosure)
N/A 12 x 3.5-inch
2072-24E (one expansion
enclosure)
N/A 24 x 2.5-inch

6
Implementing the IBM Storwize V3700
Figure 1-2 shows the front view of the 2072-24C and 24E enclosures.
Figure 1-2 IBM Storwize V3700 front view for 2072-24C and 24E enclosure
The drives are positioned in one row of 24 vertically mounted drive assemblies. The drive
slots are numbered 1 - 24, starting from the left. There is a vertical center drive bay molding
between slots 12 and 13.

Chapter 1. Overview of the IBM Storwize V3700 system
7
1.4 IBM Storwize V3700 hardware
The IBM Storwize V3700 solution is a modular storage system that is built on a common
enclosure (control enclosure and expansion enclosure).
Figure 1-3 shows an overview of the hardware components of the IBM Storwize V3700
solution.
Figure 1-3 IBM Storwize V3700 hardware components

8
Implementing the IBM Storwize V3700
Figure 1-4 shows the controller rear view of IBM Storwize V3700 models 12C and 24C.
Figure 1-4 IBM Storwize V3700 controller rear view - models 12C and 24C
In Figure 1-4, you can see that there are two power supply slots at the bottom of the
enclosure. The Power Supply units are identical and exchangeable. There are two canister
slots at the top of the chassis.
In Figure 1-5, you can see the rear view of an IBM Storwize V3700 expansion enclosure.
Figure 1-5 IBM Storwize V3700 expansion enclosure rear view - models 12E and 24E
You can see that the only difference between the control enclosure and the expansion
enclosure are the canisters. The canisters of the expansion have only the two SAS ports.
For more information about the expansion enclosure, see “Expansion enclosure” on page 10.
1.4.1 Control enclosure
Each IBM Storwize V3700 system has one control enclosure that contains two node
canisters, disk drives, and two power supplies.
Figure 1-6 shows a single node canister.
Figure 1-6 IBM Storwize V3700 node canister

Chapter 1. Overview of the IBM Storwize V3700 system
9
Each node canister contains the following hardware:
Battery
Memory: 4 GB memory (upgradeable to 8 GB)
Host Interface Card slot (different options are possible)
Four 6 Gbps SAS ports
Two 10/100/1000 Mbps Ethernet ports
Two USB 2.0 ports (one port is used during installation)
System flash
The battery is used in case of power loss. The IBM Storwize V3700 system uses this battery
to power the canister while the cache data is written to the internal system flash. This memory
dump is called a fire hose memory dump. After the system is up again, this data is loaded
back to the cache for destage to the disks.
Figure 1-6 on page 8 also shows the following ports, which are provided by the IBM Storwize
V3700 node canister:
Two 10/100/1000 Mbps Ethernet ports
Port 1 (left port) must be configured. The second port is optional and is used for
management. Both ports can be used for iSCSI traffic. For more information, see
Chapter 4, “Host configuration” on page 151.
Two USB ports.
One port is used during the initial configuration or when there is a problem. They are
numbered 1 on the left and 2 on the right. For more information about usage, see
Chapter 2, “Initial configuration” on page 27.
Four serial attached SCSI (SAS) ports.
These ports are numbered 1 on the left to 4 on the right. The IBM Storwize V3700 uses
ports 1, 2 and 3 for host connectivity and port 4 to connect to the optional expansion
enclosures. The IBM Storwize V3700 incorporates one SAS chains and four expansion
enclosures can be connected to each chain.
The two nodes act as a single processing unit and form an I/O Group that is attached to the
SAN fabric, an iSCSI infrastructure or directly attached to hosts via FC or SAS. The pair of
node is responsible for serving I/O to a volume. The two nodes provide a highly available
fault-tolerant controller so that if one node fails, the surviving node automatically takes over.
Nodes are deployed in a pair that is called an
I/O Group
.
One node is designated as the configuration node, but each node in the control enclosures
holds a copy of the control enclosure state information.
The IBM Storwize V3700 only supports one I/O group in a clustered system.
The terms
node canister
and
node
are used interchangeably throughout this book.
Service port: Do not use the port that is marked with a wrench. This port is a service port
only.

10
Implementing the IBM Storwize V3700
1.4.2 Expansion enclosure
The optional IBM Storwize V3700 expansion enclosure contains two expansion canisters,
disk drives, and two power supplies.
Figure 1-7 shows an overview of the expansion enclosure.
Figure 1-7 Expansion enclosure of the IBM Storwize V3700
The expansion enclosure power supplies are the same as the control enclosure
.
There is a
single power lead connector on each power supply unit.
Figure 1-8 shows the expansion canister ports.
Figure 1-8 Expansion canister ports
Each expansion canister that is shown in Figure 1-8 provides two SAS interfaces that are
used to connect to the control enclosure and any optional expansion enclosures. The ports
are numbered 1 on the left and 2 on the right. SAS port 1 is the IN port and SAS port 2 is the
OUT port.
The use of the SAS connector 1 is mandatory because the expansion enclosure must be
attached to a control enclosure or another expansion enclosure. SAS connector 2 is optional
because it is used to attach to more expansion enclosures.
Each port includes two LEDs to show the status. The first LED indicates the link status and
the second LED indicates the fault status.
For more information about LED or ports, see this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/topic/com.ibm.storwize.v3700.7
10.doc/tbrd4_expcanindi.html

Chapter 1. Overview of the IBM Storwize V3700 system
11
1.4.3 Host interface cards
In addition to 1Gb iSCSI, 6Gb SAS, there are options to purchase host interface cards for
your control enclosure. Table 1-3 lists the IBM Storwize V3700 configurations available.
Table 1-3 IBM Storwize V3700 configurations available
1.4.4 Disk drive types
IBM Storwize V3700 enclosures support SSD, SAS, and Nearline SAS drive types. Each
drive has two ports (two PHYs) and I/O can be issued down both paths simultaneously.
Table 1-4 shows the IBM Storwize V3700 Disk Drive types that are available at the time of
writing.
Table 1-4 IBM Storwize V3700 Disk Drive types
(1) 2.5” drive in a 3.5” drive carrier.
Standard Optional
1Gb iSCSI 6Gb SAS 1Gb iSCSI 6Gb SAS 8Gb FC 10Gb
iSCSI/FCoE
4 ports 6 ports - - - -
4 ports 6 ports 8 ports - - -
4 ports 6 ports - 8 ports - -
4 ports 6 ports - - 8 ports -
4 ports 6 ports - - - 4 ports
Drive type Speed Size
2.5-inch form factor Solid-state disk N/A 200 and 400 GB
2.5-inch form factor SAS 10,000 rpm 600 GB, 900 GB and 1.2
TB
2.5-inch form factor SAS 15,000 rpm 146 and 300 GB
2.5-inch form factor Nearline SAS 7,200 rpm 500 GB and 1 TB
3.5-inch form factor SAS 10,000 rpm 900 GB and 1.2 TB
(1)
3.5-inch form factor SAS 15,000 rpm 300 GB
(1)
3.5-inch form factor Nearline SAS 7,200 rpm 2, 3 and 4TB

12
Implementing the IBM Storwize V3700
1.5 IBM Storwize V3700 terms
In this section, we introduce the terms that are used for the IBM Storwize V3700 throughout
this book.
1.5.1 Hosts
A host system is a server that is connected to IBM Storwize V3700 through a Fibre Channel
connection, an iSCSI connection, or through a SAS connection.
Hosts are defined on IBM Storwize V3700 by identifying their worldwide port names
(WWPNs) for Fibre Channel and SAS hosts. iSCSI hosts are identified by using their iSCSI
names. The iSCSI names can be iSCSI qualified names (IQNs) or extended unique identifiers
(EUIs). For more information, see Chapter 4, “Host configuration” on page 151.
Hosts can be Fibre Channel attached via an existing Fibre Channel network infrastructure or
direct attached, iSCSI/FCoE attached via an existing IP network, or directly attached via SAS.
A significant benefit of having direct attachment is that you can attach the host directly to the
IBM Storwize V3700 without the need for an FC or IP network.
1.5.2 Node canister
Each single processing unit is a node canister, which is also called a
node
. A node canister
provides host interfaces, management interfaces, and SAS interfaces to the control
enclosure. A node canister has the cache memory, the internal storage to store software and
logs, and the processing power to run the IBM Storwize V3700 virtualizing and management
software. A clustered system consists of a one node pairs.
One of the nodes within the system is known as the
configuration node
that manages
configuration activity for the clustered system. If this node fails, the system nominates the
other node to become the configuration node.
1.5.3 I/O Group
Within IBM Storwize V3700, there is one pair of node canisters known as an
I/O group
. The
IBM Storwize V3700 supports maximum of the two node canisters in the clustered system,
which provides a single I/O Group.
When a host server performs I/O to one of its volumes, all the I/Os for a specific volume are
directed to the I/O Group. Also, under normal conditions, the I/Os for that specific volume are
always processed by the same node within the I/O Group.
Both nodes of the I/O Group act as preferred nodes for their own specific subset of the total
number of volumes that the I/O Group presents to the host servers (a maximum of 2048
volumes per system). However, both nodes also act as a failover node for its partner node.
Therefore, a node takes over the I/O workload from its partner node (if required) without
affecting the server’s application.
In a IBM Storwize V3700 environment that uses active-active architecture, the I/O handling for
a volume can be managed by both nodes. Therefore, servers that are connected through
Fibre Channel connectors must use multipath device drivers to handle this capability.

Chapter 1. Overview of the IBM Storwize V3700 system
13
The IBM Storwize V3700 I/O Group can be connected to the SAN so that all application
servers can access the volumes from the I/O Group. Up to 256 host server objects can be
defined to the IBM Storwize V3700.
1.5.4 Clustered system
A clustered system consists of two node canisters or a single I/O Group. All configuration,
monitoring, and service tasks are performed at the system level. The configuration settings
are replicated across the node canisters in the clustered system. To facilitate these tasks, one
or two management IP addresses are set for the clustered system. By using this
configuration, you can manage the clustered system as a single entity.
There is a process to back up the system configuration data on to disk so that the clustered
system can be restored in the event of a disaster. This method does not back up application
data; only IBM Storwize V3700 system configuration information is backed up.
The system can be configured by using the IBM Storwize V3700 management software
(GUI), the CLI, or the USB key.
1.5.5 RAID
The IBM Storwize V3700 contains a number of internal drives, but these drives cannot be
directly added to Storage Pools. The drives must be included in a Redundant Array of
Independent Disks (RAID) array to provide protection against the failure of individual drives.
These drives are referred to as members of the array. Each array has a RAID level. RAID
levels provide different degrees of redundancy and performance, and have different
restrictions regarding the number of members in the array.
The IBM Storwize V3700 supports hot spare drives. When an array member drive fails, the
system automatically replaces the failed member with a hot spare drive and rebuilds the array
to restore its redundancy. Candidate and spare drives can be manually exchanged with array
members.
Each array has a set of goals that describe the required location and performance of each
array. A sequence of drive failures and hot spare takeovers can leave an array unbalanced,
that is, with members that do not match these goals. The system automatically rebalances
such arrays when the appropriate drives are available.
The following RAID levels are available:
RAID 0 (striping, no redundancy)
RAID 1 (mirroring between two drives, implemented as RAID 10 with 2 drives)
Important: The active/active architecture provides availability to process I/Os for both
control nodes and allows the application to continue running smoothly, even if the server
has only one access route or path to the storage controller. This type of architecture
eliminates the path/LUN thrashing typical of an active/passive architecture.
System configuration backup: After the system configuration is backed up, save the
backup data on your hard disk (or at the least outside of the SAN). If you are unable to
access the IBM Storwize V3700, you do not have access to the backup data if it is on the
SAN. Perform this configuration backup after each configuration change to be on the safe
side.

14
Implementing the IBM Storwize V3700
RAID 5 (striping, can survive one drive fault, with parity)
RAID 6 (striping, can survive two drive faults, with parity)
RAID 10 (RAID 0 on top of RAID 1)
RAID 0 arrays stripe data across the drives. The system supports RAID 0 arrays with one
member, which is similar to traditional JBOD attach. RAID 0 arrays have no redundancy, so
they do not support hot spare takeover or immediate exchange. A RAID 0 array can be
formed by one to eight drives.
RAID 1 arrays stripe data over mirrored pairs of drives. A RAID 1 array mirrored pair is rebuilt
independently. A RAID 1 array can be formed by two drives only.
RAID 5 arrays stripe data over the member drives with one parity strip on every stripe. RAID 5
arrays have single redundancy. The parity algorithm means that an array can tolerate no more
than one member drive failure. A RAID 5 array can be formed by 3 - 16 drives.
RAID 6 arrays stripe data over the member drives with two parity stripes (which is known as
the P-parity and the Q-parity) on every stripe. The two parity strips are calculated by using
different algorithms, which give the array double redundancy. A RAID 6 array can be formed
by 5 - 16 drives.
RAID 10 arrays have single redundancy. Although they can tolerate one failure from every
mirrored pair, they cannot tolerate two-disk failures. One member out of every pair can be
rebuilding or missing at the same time. A RAID 10 array can be formed by 2 - 16 drives.
1.5.6 Managed disks
A managed disk (MDisk) refers to the unit of storage that IBM Storwize V3700 virtualizes.
This unit is a RAID array consisting of internal drives. The IBM Storwize V3700 then can
allocate these MDisks into storage pools.
An MDisk is not visible to a host system on the storage area network because it is internal in
the IBM Storwize V3700 system.
An MDisk features the following modes:
Array
Array mode MDisks are constructed from internal drives by using the RAID functionality.
Array MDisks are always associated with storage pools.
Image
Image MDisks are LUNs presented by external storage systems to an IBM Storwize
V3700 and assigned directly to a volume with a one-to-one mapping of extents between
the MDisk and the volume. For more information, see Chapter 6, “Storage migration
wizard” on page 261.
1.5.7 Quorum disks
A quorum disk is an MDisk that contains a reserved area for use exclusively by the system. In
the IBM Storwize V3700, internal drives can be considered as quorum candidates. The
clustered system uses quorum disks to break a tie when exactly half the nodes in the system
remain after a SAN failure.
The clustered system automatically forms the quorum disk by taking a small amount of space
from an MDisk. It allocates space from up to three different MDisks for redundancy, although
only one quorum disk is active.

Chapter 1. Overview of the IBM Storwize V3700 system
15
If the environment has multiple storage systems, you should allocate the quorum disk on
different storage systems to avoid the possibility of losing all of the quorum disks because of a
failure of a single storage system. It is possible to manage the quorum disks by using the CLI.
1.5.8 Storage pools
A storage pool is a collection of MDisks (up to 128) that are grouped to provide capacity for
volumes. All MDisks in the pool are split into extents with the same size. Volumes are then
allocated out of the storage pool and are mapped to a host system.
MDisks can be added to a Storage Pool at any time to increase the capacity of the pool.
MDisks can belong in only one storage pool. For more information, see Chapter 7, “Storage
pools” on page 313.
Each MDisk in the storage pool is divided into a number of extents. The size of the extent
ranges from 16 MB - 8 GB.
The extent size directly affects the maximum volume size and storage capacity of the
clustered system.
A system can manage 2^22 (4,194,304) extents. For example, with a 16 MB extent size, the
system can manage up to 16 MB x 4,194,304 = 64 TB of storage
Default extent size: The GUI of IBM Storwize V3700 has a default extent size value of
1 GB when you define a new Storage Pool. This is a change in the IBM Storwize code
v7.1. The GUI does not have the option to change the extent size. Therefore, if you want to
create Storage Pools with a different extent size, this must be done via the CLI by using the
mkmdiskgrp commands.

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Implementing the IBM Storwize V3700
The effect of extent size on the maximum volume and cluster size is shown in Table 1-5.
Table 1-5 Maximum volume and cluster capacity by extent size
Use the same extent size for all storage pools in a clustered system, which is a prerequisite if
you want to migrate a volume between two storage pools. If the storage pool extent sizes are
not the same, you must use volume mirroring to copy volumes between storage pools, as
described in Chapter 8, “Advanced host and volume administration” on page 353.
A storage pool can have a threshold warning set that automatically issues a warning alert
when the used capacity of the storage pool exceeds the set limit.
Single-tiered Storage Pool
MDisks that are used in a single-tiered Storage Pool should have the following characteristics
to prevent performance and other problems:
They should have the same hardware characteristics, for example, the same RAID type,
RAID array size, disk type, and disk revolutions per minute (rpms).
The disk subsystems providing the MDisks must have similar characteristics, for example,
maximum input/output operations per second (IOPS), response time, cache, and
throughput.
Use MDisks of the same size, and ensure that the MDisks provide the same number of
extents. If this configuration is not feasible, you must check the distribution of the volumes’
extents in that storage pool.
Multitiered Storage Pool
A multitiered Storage Pool has a mix of MDisks with more than one type of disk tier attribute;
for example, a storage pool that contains a mix of generic_hdd AND generic_ssd MDisks.
A multitiered Storage Pool contains MDisks with different characteristics as opposed to the
single-tiered Storage Pool. However, each tier should have MDisks of the same size and
MDisks that provide the same number of extents.
A multitiered Storage Pool is used to enable automatic migration of extents between disk tiers
using the IBM Storwize V3700 Easy Tier® function, as described in Chapter 9, “Easy Tier” on
page 411.
Extent size
(MB)
Maximum volume capacity for
normal volumes (GB)
Maximum storage capacity of
cluster
16 2048 (2 TB) 64 TB
32 4096 (4 TB) 128 TB
64 8192 (8 TB) 256 TB
128 16384 (16 TB) 512 TB
256 32768 (32 TB) 1 PB
512 65536 (64 TB) 2 PB
1024 131072 (128 TB) 4 PB
2048 262144 (256 TB) 8 PB
4096 262144 (256 TB) 16 PB
8192 262144 (256 TB) 32 PB

Chapter 1. Overview of the IBM Storwize V3700 system
17
1.5.9 Volumes
A volume is a logical disk that is presented to a host system by the clustered system. In our
virtualized environment, the host system has a volume that is mapped to it by IBM Storwize
V3700. The IBM Storwize V3700 translates this volume into a number of extents, which are
allocated across MDisks. The advantage with storage virtualization is that the host is
decoupled from the underlying storage, so the virtualization appliance can move around the
extents without impacting the host system.
The host system cannot directly access the underlying MDisks in the same manner as it can
access RAID arrays in a traditional storage environment.
The following types of volumes are available:
Striped
A striped volume is allocated one extent in turn from each MDisk in the storage pool. This
process continues until the space that is required for the volume is satisfied.
It also is possible to supply a list of MDisks to use.
Figure 1-9 shows how a striped volume is allocated, assuming 10 extents are required.
Figure 1-9 IBM Storwize V3700 Striped volume

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Implementing the IBM Storwize V3700
Sequential
A sequential volume is a volume in which the extents are allocated one after the other from
one MDisk to the next MDisk, as shown in Figure 1-10.
Figure 1-10 Sequential volume
Image mode
Image mode volumes are special volumes that have a direct relationship with one MDisk.
They are used to migrate existing data into and out of the clustered system to or from
external FC SAN-attached storage.
When the image mode volume is created, a direct mapping is made between extents that
are on the MDisk and the extents that are on the volume. The logical block address (LBA)
x
on the MDisk is the same as the LBA
x
on the volume, which ensures that the data on
the MDisk is preserved as it is brought into the clustered system, as shown in Figure 1-11
on page 19.

Chapter 1. Overview of the IBM Storwize V3700 system
19
Figure 1-11 Image mode volume
Some virtualization functions are not available for image mode volumes, so it is often useful to
migrate the volume into a new storage pool. After it is migrated, the MDisk becomes a
managed MDisk.
If you want to migrate data from an existing storage subsystem, use the Storage Migration
wizard, which guides you through the process.
For more information, see Chapter 6, “Storage migration wizard” on page 261.
If you add an MDisk containing data to a storage pool, any data on the MDisk is lost. If you
are presenting externally virtualized LUNs that contain data to an IBM Storwize V3700, import
them as image mode volumes to ensure data integrity or use the migration wizard.
1.5.10 iSCSI
iSCSI is an alternative method of attaching hosts to the IBM Storwize V3700. The iSCSI
function is a software function that is provided by the IBM Storwize V3700 code, not
hardware.
In the simplest terms, iSCSI allows the transport of SCSI commands and data over an
Internet Protocol network that is based on IP routers and Ethernet switches. iSCSI is a
block-level protocol that encapsulates SCSI commands into TCP/IP packets and uses an
existing IP network, instead of requiring FC HBAs and a SAN fabric infrastructure.
The following concepts of names and addresses are carefully separated in iSCSI:
An
iSCSI name
is a location-independent, permanent identifier for an iSCSI node. An
iSCSI node has one iSCSI name, which stays constant for the life of the node. The terms
initiator name
and
target name
also refer to an iSCSI name.

20
Implementing the IBM Storwize V3700
An
iSCSI address
specifies the iSCSI name of an iSCSI node and a location of that node.
The address consists of a host name or IP address, a TCP port number (for the target),
and the iSCSI name of the node. An iSCSI node can have any number of addresses,
which can change at any time, particularly if they are assigned by way of Dynamic Host
Configuration Protocol (DHCP). An IBM Storwize V3700 node represents an iSCSI node
and provides statically allocated IP addresses.
Each iSCSI node, that is, an initiator or target, has a unique iSCSI Qualified Name (IQN),
which can have a size of up to 255 bytes. The IQN is formed according to the rules that were
adopted for Internet nodes. The IQNs can be abbreviated by using a descriptive name, which
is known as an
alias
. An alias can be assigned to an initiator or a target.
The IBM Storwize V3700 also supports the use of the FCoE protocol, which encapsulates the
native Fibre Channel frames into Ethernet frames.
1.5.11 SAS
SAS standard is an alternative method of attaching hosts to the IBM Storwize V3700. The
IBM Storwize V3700 supports direct SAS host attachment that provides easy-to-use,
affordable storage needs. Each SAS port device has a worldwide unique 64-bit SAS address.
1.6 IBM Storwize V3700 features
The features that are available with the IBM Storwize V3700 are described in this section.
1.6.1 Volume mirroring
IBM Storwize V3700 provides a function that is called
storage volume mirroring
, which
enables a volume to have two physical copies. Each volume copy can belong to a different
storage pool and can be generic or thin-provisioned which provides a high-availability
solution.
When a host system issues a write to a mirrored volume, IBM Storwize V3700 writes the data
to both copies. When a host system issues a read to a mirrored volume, IBM Storwize V3700
requests it from the primary copy. If one of the mirrored volume copies is temporarily
unavailable, the IBM Storwize V3700 automatically uses the alternative copy without any
outage for the host system. When the mirrored volume copy is repaired, IBM Storwize V3700
resynchronizes the data.
A mirrored volume can be converted into a non-mirrored volume by deleting one copy or by
splitting away one copy to create a non-mirrored volume.
The use of mirrored volumes also can assist with migrating volumes between storage pools
that have different extent sizes. Mirrored volumes also can provide a mechanism to migrate
fully allocated volumes to thin-provisioned volumes without any host outages.
The Volume Mirroring feature is included as part of the base machine code and no license is
required.

Chapter 1. Overview of the IBM Storwize V3700 system
21
1.6.2 Thin provisioning
Volumes can be configured to be
thin-provisioned
or
fully allocated
. Concerning application
reads and writes, a thin-provisioned volume behaves as though they were fully allocated.
When a volume is created, the user specifies two capacities: the real capacity of the volume
and its virtual capacity.
The real capacity determines the quantity of MDisk extents that are allocated for the volume.
The virtual capacity is the capacity of the volume that is reported to IBM Storwize V3700 and
to the host servers.
The real capacity is used to store the user data and the metadata for the thin-provisioned
volume. The real capacity can be specified as an absolute value or a percentage of the virtual
capacity.
The thin provisioning feature can be used on its own to create over-allocated volumes, or it
can be used with FlashCopy. Thin-provisioned volumes can be used with the mirrored volume
feature as well.
A thin-provisioned volume can be configured to
autoexpand
, which causes IBM Storwize
V3700 to automatically expand the real capacity of a thin-provisioned volume as its real
capacity is used. This parameter prevents the volume from going offline. Autoexpand
attempts to maintain a fixed amount of unused real capacity on the volume. This amount is
known as the
contingency capacity
. The default setting is 2%.
The contingency capacity is initially set to the real capacity that is assigned when the volume
is created. If the user modifies the real capacity, the contingency capacity is reset to be the
difference between the used capacity and real capacity.
A volume that is created with a zero contingency capacity goes offline as soon as it needs
expand. A volume with a non-zero contingency capacity stays online until it is used up.
Autoexpand does not cause the real capacity to grow much beyond the virtual capacity. The
real capacity can be manually expanded to more than the maximum that is required by the
current virtual capacity, and the contingency capacity is recalculated.
To support the autoexpansion of thin-provisioned volumes, the storage pools from which they
are allocated have a configurable warning capacity. When the used free capacity of the group
exceeds the warning capacity, a warning is logged. For example, if a warning of 80% is
specified, the warning is logged when 20% of the free capacity remains.
A thin-provisioned volume can be converted to a fully allocated volume by using volume
mirroring (and vice versa).
The thin provisioning feature is included as part of the base machine code and no license is
required.
1.6.3 Easy Tier
IBM Easy Tier provides a mechanism to seamlessly migrate hot spots to the most appropriate
tier within the IBM Storwize V3700 solution. This migration might be to different tiers of
internal drive within IBM Storwize V3700.
The Easy Tier function can be turned on or off at the storage pool and volume level.

22
Implementing the IBM Storwize V3700
It is possible to demonstrate the potential benefit of Easy Tier in your environment before
installing SSDs by using the IBM Storage Advisor Tool.
The Easy Tier is described in more detail in Chapter 10, “Copy services” on page 449.
The IBM Easy Tier feature is licensed per Storwize V3700 Storage system.
1.6.4 Turbo Performance
Turbo Performance is a licensed function that provides enhanced performance for the system.
A 90-day trial version of this function is available. If a license is not purchased and activated
before the trial period expires, the system reverts to non-turbo performance.
The Turbo Performance feature does not require hardware changes and is nondisruptive
upgrade.
The Turbo Performance feature is licensed per IBM V3700 Storage system.
1.6.5 Storage Migration
The IBM Storwize V3700 Storage Migration feature allows you to easily move data from other
Fibre Channel attached external storage to the internal capacity of the IBM Storwize V3700.
Migrating data from other storage to the IBM Storwize V3700 storage system provides benefit
from more functionality, such as the easy-to-use GUI, internal virtualization, thin provisioning,
and Copy Services.
The Storage Migration feature is included as part of the base machine code and no license is
required.
1.6.6 FlashCopy
FlashCopy copies a source volume on to a target volume. The original contents of the target
volume are lost. After the copy operation starts, the target volume has the contents of the
source volume as it existed at a single point. Although the copy operation takes time, the
resulting data at the target appears as though the copy was made instantaneously.
FlashCopy is sometimes described as an instance of a time-zero (T0) copy or a point-in-time
(PiT) copy technology.
FlashCopy can be performed on multiple source and target volumes. FlashCopy permits the
management operations to be coordinated so that a common single point-in-time is chosen
for copying target volumes from their respective source volumes.
IBM Storwize V3700 also permits multiple target volumes to be FlashCopied from the same
source volume. This capability can be used to create images from separate points in time for
the source volume, and to create multiple images from a source volume at a common point in
time. Source and target volumes can be thin-provisioned volumes.
Reverse FlashCopy enables target volumes to become restore points for the source volume
without breaking the FlashCopy relationship and without waiting for the original copy
operation to complete. IBM Storwize V3700 supports multiple targets and thus multiple
rollback points.
The base FlashCopy feature, which requires no license, provides up to 64 mappings. An
optional license is available to upgrade FlashCopy mappings up to 2,040 mappings.

Chapter 1. Overview of the IBM Storwize V3700 system
23
1.6.7 Remote Copy
Remote Copy can be maintained in one of two modes: synchronous or asynchronous.
With the IBM Storwize V3700, Metro Mirror and Global Mirror are the IBM branded terms for
the functions that are synchronous Remote Copy and asynchronous Remote Copy.
The Metro Mirror and Global Mirror Copy Services features enable you to set up a
relationship between two volumes so that updates that are made by an application to one
volume are mirrored on the other volume. The volumes can be in the same system or on two
different systems.
For Metro Mirror and Global Mirror copy types, one volume is designated as the primary and
the other volume is designated as the secondary. Host applications write data to the primary
volume and updates to the primary volume are copied to the secondary volume. Normally,
host applications do not perform I/O operations to the secondary volume.
The Metro Mirror feature provides a synchronous-copy process. When a host writes to the
primary volume, it does not receive confirmation of I/O completion until the write operation
has completed for the copy on both the primary volume and the secondary volume. This
ensures that the secondary volume is always up-to-date with the primary volume in the event
that a failover operation must be performed.
The Global Mirror feature provides an asynchronous-copy process. When a host writes to the
primary volume, confirmation of I/O completion is received before the write operation has
completed for the copy on the secondary volume. If a failover operation is performed, the
application must recover and apply any updates that were not committed to the secondary
volume. If I/O operations on the primary volume are paused for a small length of time, the
secondary volume can become an exact match of the primary volume.
Global Mirror can operate with or without cycling. When operating without cycling, write
operations are applied to the secondary volume as soon as possible after they are applied to
the primary volume. The secondary volume is generally less than 1 second behind the
primary volume, which minimizes the amount of data that must be recovered in the event of a
failover. However, this requires that a high-bandwidth link be provisioned between the two
sites.
When Global Mirror operates with cycling mode, changes are tracked and where needed
copied to intermediate change volumes. Changes are transmitted to the secondary site
periodically. The secondary volumes are much further behind the primary volume, and more
data must be recovered in the event of a failover. Because the data transfer can be smoothed
over a longer time period, however, lower bandwidth is required to provide an effective
solution.
For more information about the IBM Storwize V3700 Copy Services, see Chapter 10, “Copy
services” on page 449.
IBM Remote Copy is licensed per IBM Storwize V3700 Storage system.
Copy Services configuration limits
For the most up-to-date list of these limits, see this website:
http://www-01.ibm.com/support/docview.wss?rs=591&uid=ssg1S1004380

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Implementing the IBM Storwize V3700
1.7 Problem management and support
In this section, we introduce problem management and support topics.
1.7.1 IBM Assist On-site and remote service
The IBM Assist On-site tool is a remote desktop-sharing solution that is offered through the
IBM website. With it, the IBM service representative can remotely view your system to
troubleshoot a problem.
You can maintain a chat session with the IBM service representative so that you can monitor
this activity and understand how to fix the problem yourself or allow the representative to fix it
for you.
To use the IBM Assist On-site tool, the management PC that is used to manage the IBM
Storwize V3700 must be able to access the Internet. For more information about this tool, see
this website:
http://www.ibm.com/support/assistonsite/
When you access the website, you sign in and enter a code that the IBM service
representative provides to you. This code is unique to each IBM Assist On-site session. A
plug-in is downloaded on to your PC to connect you and your IBM service representative to
the remote service session. The IBM Assist On-site contains several layers of security to
protect your applications and your computers.
You also can use security features to restrict access by the IBM service representative.
1.7.2 Event notifications
IBM Storwize V3700 can use Simple Network Management Protocol (SNMP) traps, syslog
messages, and a Call Home email to notify you and the IBM Support Center when significant
events are detected. Any combination of these notification methods can be used
simultaneously.
Each event that IBM Storwize V3700 detects is sent to a different recipient. You can configure
IBM Storwize V3700 to send each type of notification to specific recipients or only the alerts
that are important to the system.
1.7.3 SNMP traps
SNMP is a standard protocol for managing networks and exchanging messages. IBM
Storwize V3700 can send SNMP messages that notify personnel about an event. You can use
an SNMP manager to view the SNMP messages that IBM Storwize V3700 sends. You can
use the management GUI or the IBM Storwize V3700 CLI to configure and modify your
SNMP settings.
You can use the Management Information Base (MIB) file for SNMP to configure a network
management program to receive SNMP messages that are sent by the IBM Storwize V3700.
This file can be used with SNMP messages from all versions of IBM Storwize V3700
software.

Chapter 1. Overview of the IBM Storwize V3700 system
25
1.7.4 Syslog messages
The syslog protocol is a standard protocol for forwarding log messages from a sender to a
receiver on an IP network. The IBM Storwize V3700 can send syslog messages that notify
personnel about an event. IBM Storwize V3700 can also transmit syslog messages in
expanded or concise format. You can use a syslog manager to view the syslog messages that
IBM Storwize V3700 sends. IBM Storwize V3700 uses the User Datagram Protocol (UDP) to
transmit the syslog message. You can use the management GUI or the CLI to configure and
modify your syslog settings.
1.7.5 Call Home email
The Call Home feature transmits operational and error-related data to you and IBM through a
Simple Mail Transfer Protocol (SMTP) server connection in the form of an event notification
email. When it is configured, this function alerts IBM service personnel about hardware
failures and potentially serious configuration or environmental issues. You can use the call
home function if you have a maintenance contract with IBM or if the IBM Storwize V3700 is
within the warranty period.
To send email, you must configure at least one SMTP server. You can specify as many as five
other SMTP servers for backup purposes. The SMTP server must accept the relaying of email
from the IBM Storwize V3700 clustered system IP address. You can then use the
management GUI or CLI to configure the email settings, including contact information and
email recipients. Set the reply address to a valid email address. Send a test email to check
that all connections and infrastructure are set up correctly. You can disable the Call Home
function at any time by using the management GUI or CLI.
1.7.6 Useful IBM Storwize V3700 websites
For more information about the IBM Storwize V3700, see the following websites:
The IBM Storwize V3700 home page:
http://www.ibm.com/systems/storage/disk/storwize_v3700/index.html
IBM Storwize V3700 Configuration Limit and Restrictions:
http://www.ibm.com/support/docview.wss?rs=591&uid=ssg1S1004380
IBM Storwize V3700 Online Information Center:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp
lBM Redbooks publications about IBM Storwize V3700:
http://www.redbooks.ibm.com/cgi-bin/searchsite.cgi?query=V3700&SearchOrder=1&Se
archFuzzy=

26
Implementing the IBM Storwize V3700
IBM Storwize V3700 learning videos on YouTube
Videos are available on YouTube that describe the Storwize GUI and are available at the
URLs that are shown in Table 1-6.
Table 1-6 Videos available on YouTube
These videos are applicable not only to IBM Storwize V3700 but also to the IBM Storwize
V7000 because the GUI interface, functions, and features are similar to both products.
Video description URL
Introducing IBM Storwize V3700 http://www.youtube.com/watch?v=AePPKiXE4xM
IBM Storwize V3700 what’s new http://www.youtube.com/watch?v=IdxnH9YWF9s
IBM Storwize V7000 Volume management http://www.youtube.com/watch?v=YXeKqH8Sd9o
IBM Storwize V7000 Migration http://www.youtube.com/watch?v=dXxnUN6dk74
IBM Storwize V7000 Introduction to FlashCopy http://www.youtube.com/watch?v=MXWgGWjBzG4
IBM SAN Volume Controller and Storwize V7000
Performance Panel Sped-up! (HD)
http://www.youtube.com/watch?v=7noC71tLkWs
IBM Storwize V3700 Hardware Installation http://www.youtube.com/watch?v=VuEfmfXihrs
IBM Storwize V3700 - Effortless Management http://www.youtube.com/watch?v=BfGbKWcCsR4
IBM Storwize V3700 Initial Setup http://www.youtube.com/watch?v=oj9uhTYe6gg
IBM Storwize V7000 Installation http://www.youtube.com/watch?v=kCCFxM5ZMV4

© Copyright IBM Corp. 2013. All rights reserved.
27
Chapter 2.
Initial configuration
This chapter provides a description of the initial configuration steps for the IBM Storwize
V3700.
This chapter includes the following topics:
Planning for IBM Storwize V3700 installation
First time setup
Initial configuration steps
Call Home, email event alert, and inventory settings
2

28
Implementing the IBM Storwize V3700
2.1 Hardware installation planning
Proper planning before the actual physical installation of the hardware is required. The
following checklist of requirements can be used to plan your installation:
 Install the hardware as described in IBM Storwize V3700 Quick Installation Guide,
GC27-4219
 For more information about planning the IBM Storwize V3700 environment, see this
website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.
storwize.v3700.710.doc%2Fsvc_webplanning_21pb8b.html
 An appropriate 19-inch rack with 2 - 10 U of space should be available, depending on the
number of enclosures to install. Each enclosure measures 2 U and a single control
enclosure with up to four expansion enclosures constitutes an IBM Storwize V3700
system.
 There should be redundant power outlets in the rack for each of the two power cords that
are included per enclosure. In all, 2 - 10 outlets are required, depending on the number of
enclosures to install. The power cords conform to the IEC320 C13/C14 standards.
 A minimum of four Fibre Channel ports that are attached to the fabric are required.
However, it is a best practice to use eight 2-, 4-, or 8-Gbps Fibre Channel ports.
 You should have eight 2-, 4-, or 8-Gbps compatible Fibre Channel cable drops.
 Up to six hosts can be directly connected by using SAS ports 1, 2, and 3 on each node
canister, with SFF-8644 mini SAS HD cabling.
 You should have a minimum of two Ethernet ports on the LAN, with four preferred for more
configuration access redundancy or iSCSI host access.
 You should have a minimum of two Ethernet cable drops, with four preferred for more
configuration access redundancy or iSCSI host access. Ethernet port one on each node
canister must be connected to the LAN, with port two as optional.
 Verify that the default IP addresses that are configured on Ethernet port 1 on each of the
node canisters (192.168.70.121 on node one and 192.168.70.122 on node 2) do not
conflict with existing IP addresses on the LAN. The default mask that is used with these IP
addresses is 255.255.255.0 and the default gateway address that is used is 192.168.70.1.
 You should have a minimum of three IPv4 or IPv6 IP addresses for system configuration.
One is for the clustered system and is what the administrator uses for management, and
one for each node canister for service access as needed.
Fibre Channel ports: Fibre Channel ports are required only if you are using FC hosts.
You can use the IBM Storwize V3700 with Ethernet-only cabling for iSCSI hosts or use
SAS cabling for direct attach hosts.
Ports: Port 1 on each node canister must be connected to the same physical LAN or be
configured in the same VLAN and be on the same subnet or set of subnets.

Chapter 2. Initial configuration
29
 A minimum of one and up to four IPv4 or IPv6 addresses are needed if iSCSI-attached
hosts access volumes from the IBM Storwize V3700.
 A single 1, 3, or 6 meter SAS cable per expansion enclosure is required. The length of the
cables depends on the physical rack location of the expansion relative to the control
enclosure or other expansion enclosures. Locate the control enclosure so that up to four
enclosures can be located, as shown in Figure 2-1. The IBM Storwize V3700 supports one
external SAS chain using SAS port 4 on the control enclosure node canisters.
Figure 2-1 Connecting the SAS expansion cables example
The following connections must be made:
– Connect SAS port 4 of the left node canister in the control enclosure to SAS port 1 of
the left expansion canisters in the first expansion enclosure.
IP addresses: A fourth IP address should be used for backup configuration access.
This other IP address allows a second system IP address to be configured on port 2 of
either node canister, which the storage administrator can also use for management of
the IBM Storwize V3700 system.

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Implementing the IBM Storwize V3700
– Connect SAS port 4 of the right node canister in the control enclosure to SAS port 1 of
the right expansion canisters in the first expansion enclosure.
– Connect SAS port 2 of the left node canister in the first expansion enclosure to SAS
port 1 of the left expansion canister in the second expansion enclosure.
– Connect SAS port 2 of the right node canister in the first expansion enclosure to SAS
port 1 of the right expansion canister in the second expansion enclosure
Continue in this fashion, adding expansion controllers on the SAS chains originating at port 4
on the control enclosure node canisters.
2.2 SAN configuration planning
The recommended SAN configuration is composed of a minimum of two fabrics that
encompass all host ports, and any ports on external storage systems that are to be virtualized
by IBM Storwize V3700. The IBM Storwize V3700 ports are evenly split between the two
fabrics to provide redundancy in the event one of the fabrics goes offline (planned or
unplanned).
Zoning must be implemented after the IBM Storwize V3700, hosts, and optional external
storage systems are connected to the SAN fabrics.
To enable the node canisters to communicate with each other in band, create a zone with only
the IBM Storwize V3700 WWPNs (two from each node canister) on each of the two fabrics. If
there is an external storage system that is to be virtualized, create a zone in each fabric with
the IBM Storwize V3700 WWPNs (two from each node canister) with up to a maximum of
eight WWPNs from the external storage system. Assuming every host has a Fibre Channel
connection to each fabric, then in each fabric, create a zone with the host WWPN and one
WWPN from each node canister in the IBM Storwize V3700 system. The critical point is that
there should only ever be one initiator (host HBA) in any zone. For load balancing between
the node ports on the IBM Storwize V3700, alternate the host Fibre Channel ports between
the ports of the IBM Storwize V3700.
There should be a maximum of eight paths through the SAN from each host to the IBM
Storwize V3700. Hosts where this number is exceeded are not supported. The restriction is
there to limit the number of paths that the multi-pathing driver must resolve. A host with only
two host bus adapters (HBAs) should not exceed this limit with proper zoning in a dual fabric
SAN.
Disk drives: The disk drives that are included with the control enclosure (model 2072-12C
or 2072-24C) are part of the single SAS chain. The expansion enclosures should be
connected to the SAS chain as shown in Figure 2-1 on page 29 so that they can use the
full bandwidth of the system.
Virtualized Storage: External storage systems that are to be virtualized are used for
migration purposes only.
Maximum ports or WWPNs: IBM Storwize V3700 supports a maximum of 16 ports or
WWPNs from a virtualized external storage system.

Chapter 2. Initial configuration
31
Figure 2-2 shows how to cable devices to the SAN. Refer to this example as we describe the
zoning.
Figure 2-2 SAN cabling and zoning diagram
Create a host/IBM Storwize V3700 zone for each server to which volumes are mapped to and
from the clustered system, as shown in the following examples in Figure 2-2:
Zone Host 1 port 1 (HBA 1) with both node canister ports 1
Zone Host 1 port 2 (HBA 2) with both node canister ports 2
Zone Host 2 port 1 (HBA 1) with both node canister ports 3
Zone Host 2 port 2 (HBA 2) with both node canister ports 4
Similar zones should be created for all other hosts with volumes that are on the IBM Storwize
V3700.
Verify interoperability with which the IBM Storwize V3700 connects to SAN switches or
directors by starting at this website:
http://www.ibm.com/support/docview.wss?uid=ssg1S1004388
Switches or directors are at the firmware levels that are supported by the IBM Storwize
V3700.
Important: IBM Storwize V3700 port login maximum that is listed in the restriction
document must not be exceeded. The document is available at this website:
http://www-01.ibm.com/support/docview.wss?rs=591&uid=ssg1S1004380
Connectivity issues: If you have any connectivity issues between IBM Storwize V3700
ports and Brocade SAN Switches or Directors at 8 Gbps, see this website for the correct
setting of the fillword port config parameter in the Brocade operating system:
http://www-01.ibm.com/support/docview.wss?rs=591&uid=ssg1S1003699

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Implementing the IBM Storwize V3700
IBM Storwize V3700 can be used with a direct attach Fibre Channel host configuration. The
recommended configuration for direct attachment is to have at least one Fibre Channel cable
from the host connected to each node of the IBM Storwize V3700 to provide redundancy in
the event one of the nodes goes offline, as shown in Figure 2-3.
Figure 2-3 FC direct-attach host configuration
Verify direct attach interoperability with the IBM Storwize V3700 and the supported server
operating systems by following the requirements that are provided at this website:
http://www.ibm.com/systems/support/storage/ssic/interoperability.wss
2.3 SAS direct attach planning
There are three SAS ports (ports 1,2 and 3) per node canister that are available for direct host
attach on an IBM Storwize V3700. Do not use port 4 because it is reserved for expansion
enclosure connectivity only. See Figure 2-4 on page 33 to correctly identify ports 1,2 and 3.
Also, note the keyway in the top of the SAS connector.
Important: It is possible to insert the cables upside down despite the keyway. Ensure the
blue tag on the SAS connector is underneath when inserting the cable.

Chapter 2. Initial configuration
33
Figure 2-4 SAS port identification
Although it is possible to attach six hosts, one to each of the three available SAS ports on the
two node canisters, the recommended configuration for direct attachment is to have at least
one SAS cable from the host connected to each node of the IBM Storwize V3700. This
configuration provides redundancy in the event one of the nodes goes offline, as shown in
Figure 2-5.
Figure 2-5 SAS host direct attach

34
Implementing the IBM Storwize V3700
2.4 LAN configuration planning
There are two Ethernet ports per node canister that are available for connection to the LAN
on an IBM Storwize V3700 system.
Ethernet port 1 is for accessing the management GUI, the service assistant GUI for the node
canister, and iSCSI host attachment. Port 2 can be used for the management GUI and iSCSI
host attachment.
Each node canister in a control enclosure connects over an Ethernet cable from Ethernet port
1 of the canister to an enabled port on your Ethernet switch or router. Optionally, you can
attach an Ethernet cable from Ethernet port 2 on the canister to your Ethernet network.
Table 2-1 shows possible IP configuration of the Ethernet ports on the IBM Storwize V3700
system.
Table 2-1 IBM Storwize V3700 IP address configuration options per node canister
2.4.1 Management IP address considerations
Because Ethernet port 1 from each node canister must be connected to the LAN, a single
management IP address for the clustered system is configured as part of the initial setup of
the IBM Storwize V3700 system.
The management IP address is associated with one of the node canisters in the clustered
system and that node then becomes the configuration node. Should this node go offline
(planned or unplanned), the management IP address fails over to the other node’s Ethernet
port 1.
For more clustered system management redundancy, you should connect Ethernet port 2 on
each of the node canisters to the LAN, which allows for a backup management IP address to
be configured for access, if necessary.
Configuring IP addresses: There is no issue with configuring multiple IPv4 or IPv6
addresses on an Ethernet port or the use of the same Ethernet port for management and
iSCSI access. However, you cannot use the same IP address for management and iSCSI
host use.
Storwize V3700 Management Node Canister 1 Storwize V3700 Partner Node Canister 2
IPv4/6 management address ETH PORT 1 IPv4/6 service address ETH PORT 1
IPv4/6 service address IPv4/6 iSCSI address
IPv4/6 iSCSI address
IPv4/6 management address ETH PORT 2 IPv4/6iSCSI address ETH PORT 2
IPv4/6 iSCSI address
IP management addresses: The IP management address that is shown on Node
Canister 1 in Table 2-1 on page 34 is an address on the configuration node; in case of
failover, this address transfers to Node Canister 2 and this node canister becomes the new
configuration node. The management addresses are managed by the configuration node
canister only (1 or 2; in this case by Node Canister 1).

Chapter 2. Initial configuration
35
Figure 2-6 shows a logical view of the Ethernet ports that are available for configuration of the
one or two management IP addresses. These IP addresses are for the clustered system and
therefore are associated with only one node, which is then considered the configuration node.
Figure 2-6 Ethernet ports available for configuration
2.4.2 Service IP address considerations
Ethernet port 1 on each node canister is used for system management and for service access
when required. In normal operation, the service IP addresses are not needed. However, in the
event of a node canister problem, it might be necessary for service personnel to log on to the
node to perform service actions.
Figure 2-7 on page 36 shows a logical view of the Ethernet ports that are available for
configuration of the service IP addresses. Only port one on each node can be configured with
a service IP address.

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Implementing the IBM Storwize V3700
Figure 2-7 Service IP addresses available for configuration
2.5 Host configuration planning
Hosts should have two Fibre Channel connections for redundancy, but the IBM Storwize
V3700 also supports hosts with a single HBA port connection. However, if that HBA, its link to
the SAN fabric, or the fabric fails, the host loses access to its volumes. Even with a single
connection to the SAN, the host has multiple paths to the IBM Storwize V3700 volumes
because that single connection must be zoned with at least one Fibre Channel port per node.
Therefore, a multipath driver is required. This is also true for direct attach SAS hosts. They
can be connected by using a single host port that allows up to six hosts to be configured.
However, two SAS connections per host are recommended for redundancy. If two
connections per host are used, then a multipath driver also is required on the host. If iSCSI
host is to be used, they also require an MPIO driver. Both node canisters should be
configured and connected to the network so any iSCSI hosts see at least two paths to
volumes and an MPIO driver is required to resolve these.
SAN Boot is supported by IBM Storwize V3700. The requirements are listed on the IBM
Storwize V3700 support matrix and configuration instructions are provided in the IBM
Storwize V3700 Host Attachment Guide, which can be found at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Fsvc_hostattachmentmain.html

Chapter 2. Initial configuration
37
Verify that the hosts that access volumes from the IBM Storwize V3700 meet the
requirements that are found at this website:
http://www-947.ibm.com/support/entry/portal/overview/hardware/system_storage/disk_
systems/entry-level_disk_systems/ibm_storwize_v3700
Multiple OSs are supported by IBM Storwize V3700. For more information about
HBA/Driver/multipath combinations, see this website:
http://www-03.ibm.com/systems/support/storage/ssic/interoperability.wss
As per the IBM System Storage Interoperation Center (SSIC), keep the following items under
consideration:
Host operating systems are at the levels that are supported by the IBM Storwize V3700.
HBA BIOS, device drivers, firmware, and multipathing drivers are at the levels that are
supported by IBM Storwize V3700.
If boot from SAN is required, ensure that it is supported for the operating systems that are
deployed.
If host clustering is required, ensure that it is supported for the operating systems that are
deployed.
All direct connect hosts should have the HBA set to point-to-point.
For more information about host configuration, see Chapter 4, “Host configuration” on
page 151.
2.6 Miscellaneous configuration planning
During the initial setup of the IBM Storwize V3700 system, the installation wizard asks for
various information that you should have available during the installation process. Several of
these fields are mandatory to complete the initial configuration.
The information in the following checklist is helpful to have before the initial setup is
performed. The date and time can be manually entered, but to keep the clock synchronized,
use a network time protocol (NTP) service:
 Document the LAN NTP server IP address that is used for synchronization of devices.
 For alerts to be sent to storage administrators and to set up Call Home to IBM for service
and support, you need the following information:
 Name of primary storage administrator for IBM to contact, if necessary.
 Email address of the storage administrator for IBM to contact, if necessary.
 Phone number of the storage administrator for IBM to contact, if necessary.
 Physical location of the IBM Storwize V3700 system for IBM service (for example,
Building 22, first floor).
 SMTP or email server address to direct alerts to and from the IBM Storwize V3700.
 For the Call Home service to work, the IBM Storwize V3700 system must have access
to an SMTP server on the LAN that can forward emails to the default IBM service
address: callhome1@de.ibm.com for Americas-based systems and
callhome0@de.ibm.com for the rest of the world.
 Email address of local administrators that must be notified of alerts.

38
Implementing the IBM Storwize V3700
 IP address of SNMP server to direct alerts to, if required (for example, operations or
Help desk).
After the IBM Storwize V3700 initial configuration, you might want to add more users who can
manage the system. You can create as many users as you need, but the following roles
generally are configured for users:
Security Admin
Administrator
CopyOperator
Service
Monitor
The user in the Security Admin role can perform any function on the IBM Storwize V3700.
The user in the Administrator role can perform any function on the IBM Storwize V3700
system, except create users.
The user in the CopyOperator role can view anything in the system, but the user can
configure and manage only the copy functions of the FlashCopy capabilities.
The user in the Monitor role can view object and system configuration information but cannot
configure, manage, or modify any system resource.
The only other role that is available is the service role, which is used if you create a user ID for
the IBM service representative. This user role allows IBM service personnel to view anything
on the system (as with the monitor role) and perform service-related commands, such as
adding a node back to the system after it is serviced or including disks that were excluded.
For more information about creating users, see Chapter 3, “Graphical user interface
overview” on page 73.
2.7 System management
The GUI is used to configure, manage, and troubleshoot the IBM Storwize V3700 system. It is
used primarily to configure RAID arrays and logical drives, assign logical drives to hosts,
replace and rebuild failed disk drives, and expand the logical drives.
It allows for troubleshooting and management tasks, such as checking the status of the
storage server components, updating the firmware, and managing the storage server.
The GUI also offers advanced functions, such as FlashCopy, Volume Mirroring, Remote
Mirroring and EasyTier. A command-line interface (CLI) for the IBM Storwize V3700 system is
also available.
This section describes system management by using the GUI and CLI.
User creation: The create users function is allowed by the Security Admin role only and
should be limited to as few users as possible.

Chapter 2. Initial configuration
39
2.7.1 Graphical user interface
A web browser is used for GUI access. You must use a supported web browser to access the
management GUI. For more information about supported web browsers, see Checking your
web browser settings for the management GUI, which is available at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Fsvc_configuringbrowser_1obg15.html
Complete the following steps to open the Management GUI from any web browser:
1. Browse to one of the following locations:
a.http(s)://host name of your cluster/
b.http(s)://cluster IP address of your cluster/ (for example,
https://192.168.70.120)
2. Use the following default login information:
– User ID: superuser
– Password: passw0rd
For more information about how to use this interface, see this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Fsvc_managementgui_971012.html
More information also can be found in Chapter 3, “Graphical user interface overview” on
page 73.

40
Implementing the IBM Storwize V3700
After the initial configuration that is described in 2.9, “Initial configuration” on page 50 is
completed, the IBM Storwize V3700 Welcome window opens, as shown in Figure 2-8.
Figure 2-8 Setup wizard: Welcome window
2.7.2 Command-line interface
The CLI is a flexible tool for system management that uses the SSH protocol. A public/private
SSH key pair is optional for SSH access. For more information about setting up SSH access
for Windows, Linux, or UNIX systems, see Appendix A, “Command-line interface setup and
SAN Boot” on page 593.
The storage system can be managed by using the CLI, as shown in Example 2-1.
Example 2-1 System management by using the CLI
IBM_Storwize:mcr-atl-cluster-01:superuser>lsenclosureslot
enclosure_id slot_id port_1_status port_2_status drive_present drive_id
1 1 online online yes 20
1 2 online online yes 22
1 3 online online yes 21
1 4 online online yes 23
1 5 online online yes 17
1 6 online online yes 12
1 7 online online yes 10
1 8 online online yes 18
1 9 online online yes 9
1 10 online online yes 11
1 11 online online yes 8
1 12 online online yes 14

Chapter 2. Initial configuration
41
1 13 online online yes 15
1 14 online online yes 13
1 15 online online yes 16
1 16 online online yes 19
1 17 online online yes 1
1 18 online online yes 3
1 19 online online yes 6
1 20 online online yes 0
1 21 online online yes 4
1 22 online online yes 7
1 23 online online yes 2
1 24 online online yes 5
IBM_Storwize:mcr-atl-cluster-01:superuser>
The initial IBM Storwize V3700 system setup should be done by using the process and tools
that are described in 2.8, “First-time setup”.
2.8 First-time setup
This section describes how to perform a first-time IBM Storwize V3700 system setup.
IBM Storwize V3700 uses an easy to use initial setup process that is contained within a USB
key. The USB key is delivered with each storage system and contains the initialization
application file InitTool.exe. The tool is configured with your IBM Storwize V3700 system
management IP address, the subnet mask, and the network gateway address by first
plugging the USB stick into a Windows or Linux system.
The IBM Storwize V3700 starts the initial setup when you plug in the USB key with the newly
created file in to the storage system.
The USB stick contains a readme file that provides details abut how to use the tool with
various operating systems. The following operating systems are supported:
Microsoft Windows 7 (64-bit)
Microsoft Windows XP (32-bit only)
Apple Mac OS(R) X 10.7
Red Hat Enterprise Server 5
Ubuntu desktop 11.04
USB key: If you are unable to find the official USB key that is supplied with the IBM
Storwize V3700, you can use any USB key that you have and download and copy the
initTool.exe application from the following IBM Storwize V3700 Support website:
http://www.ibm.com/storage/support/Storwize/V3700

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Implementing the IBM Storwize V3700
We use Windows in the following examples.
Complete the following steps to complete the initial setup using the USB key:
1.Plug the USB key into a Windows system and start the initialization tool. If the system is
configured to autorun USB keys, the initialization tool starts automatically; otherwise, open
My Computer and double-click the InitTool.bat file. The opening window of the tool is
shown in Figure 2-9. After the tool is started, select Next and select Create a new
system.
Figure 2-9 System Initialization: Welcome window
Mac OS or Linux: For Mac OS or Linux, complete the following steps:
a.Open a terminal window.
b.Locate the root directory of the USB flash drive:
• For Mac systems, the root directory is often in the /Volumes/ directory.
• For Linux systems, the root directory is often in the /media/ directory.
• If an automatic mount system is used, the root directory can be located by
entering the mount command.
c.Change the directory to the root directory of the flash drive.
d.Enter: sh InitTool.sh

Chapter 2. Initial configuration
43
2.The option for creating a system is shown in Figure 2-10.
Figure 2-10 System Initialization: Create a new system
There are other options available through the Tasks section; however, these are generally
only required after initial configuration. There is the option to reset the superuser password or
set the service IP of a node canister. Selecting Next (as shown in Figure 2-10) progresses
through the initial configuration of the IBM Storwize V3700.

44
Implementing the IBM Storwize V3700
3.Set the Management IP address, as shown in Figure 2-11.
Figure 2-11 System Initialization: Management IP

Chapter 2. Initial configuration
45
4.Click Apply and Next to show the IBM Storwize V3700 power up instructions, as shown in
Figure 2-12.
Figure 2-12 Initialization application: V3700 Power up
Any expansion enclosures that are part of the system should be powered up and allowed
to come ready before the control enclosure. Follow the instructions to power up the IBM
Storwize V3700 and wait for the status LED to flash. Then insert the USB stick in one of
the USB ports on the left node canister. This node becomes the control node and the
other node is the partner node. The fault LED begins to flash. When it stops, return the
USB stick to the Windows PC.
Clustered system creation: While the clustered system is created, the amber fault
LED on the node canister flashes. When this LED stops flashing, remove the USB key
from IBM Storwize V3700 and insert it in your system to check the results.

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Implementing the IBM Storwize V3700
The wizard then attempt to verify connectivity to the IBM Storwize V3700, as shown in
Figure 2-13.
Figure 2-13 Verify system connectivity

Chapter 2. Initial configuration
47
If successful, a summary page is displayed that shows the settings that were applied to
the IBM Storwize V3700, as shown in Figure 2-14.
Figure 2-14 Initialization Summary

48
Implementing the IBM Storwize V3700
If the connectivity to the IBM Storwize V3700 cannot be verified, the wizard shows the
error message as shown in Figure 2-15.
Figure 2-15 Initialization Failure
Follow the instructions to resolve any issues. The wizard assumes the system you are
using can connect to the IBM Storwize V3700 through the network. If it is not, you must
follow step 1 from a machine that does have network access to the IBM Storwize V3700.
After the initialization process completes successfully, click Finish.
5.The initial setup is now complete. If you have a network connection to the IBM Storwize
system, the wizard re-directs you, as shown in Figure 2-16 on page 49.

Chapter 2. Initial configuration
49
Figure 2-16 System Initialization complete
We review system initial configuration by using the GUI in 2.9, “Initial configuration” on
page 50.

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2.9 Initial configuration
This section describes how to complete the initial configuration, including the following tasks:
Setting name, date, and time
Initial storage configuration by using the setup wizard
If you just completed the initial setup, that wizard automatically re-directs to the IBM Storwize
V3700 GUI. Otherwise, complete the following steps to complete the initial configuration
process:
1.Start the configuration wizard by using a web browser on a workstation and point it to the
system management IP address that was defined in Figure 2-11 on page 44. Enter the
default superuser password <passw0rd> (where 0 = zero), as shown in Figure 2-17.
Figure 2-17 Setup wizard: Login

Chapter 2. Initial configuration
51
2.After you are logged in, a welcome window opens, as shown in Figure 2-18.
Figure 2-18 GUI welcome window
Click Next to start the configuration wizard.
3.The first window that is opened is the Licensed Functions window, as shown in
Figure 2-19.
Figure 2-19 IBM Storwize V3700 licensing setup window

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The IBM Storwize V3700 includes a trial license for EasyTier, Remote Copy, and Turbo
Performance. Additionally, there is an upgrade option to FlashCopy to increase the
number of flash copies from the standard 64 to a maximum of 2,048. In our example, the
trial licenses for Remote Copy and EasyTier are active and show their expiration date.
4.Set up the system name as shown in Figure 2-20.
Figure 2-20 Setup wizard: Insert system name

Chapter 2. Initial configuration
53
5.There are two options for configuring the date and time, as shown in Figure 2-21.
Figure 2-21 Setup wizard: Date and time
Select the required method and enter the data and time manually or specify a network
address for a Network Time Protocol server. After this is complete, click Apply and Next
to continue.
6.The configuration wizard continues with the hardware configuration. Verify the hardware,
as shown in Figure 2-22 on page 54.

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Figure 2-22 Setup wizard: Verify the detected hardware
Click Apply and Next.
7.The next window in the configuration process is setting up Call Home, as shown in
Figure 2-23.
Figure 2-23 Call home setup

Chapter 2. Initial configuration
55
It is possible to configure your system to send email reports to IBM if an issue that requires
hardware replacement is detected. This function is called
Call Home
. When this email is
received, IBM automatically opens a problem report and contacts you to verify whether
replacements parts are required.
IBM Storwize V3700 can use Simple Network Management Protocol (SNMP) traps, syslog
messages, and Call Home email to notify you and the IBM Support Center when
significant events are detected. Any combination of these notification methods can be
used simultaneously.
To set up up Call Home, you need the location details of the IBM Storwize V3700, Storage
Administrators details, and at least one valid SMTP server IP address. If you do not want
to configure Call Home, it is possible to do it later by using the GUI option Settings 
Event Notification (for more information, see 2.9.2, “Configure Call Home, email alert,
and inventory” on page 66). If your system is under warranty or you have a hardware
maintenance agreement to enable pro-active support of the IBM Storwize V3700, it is
recommended that Call Home be configured. Select Yes and click Next to move to the
window in which you can enter the location details, as shown in Figure 2-24.
Figure 2-24 Location details
These details are shown on the Call Home data to enable IBM Support to correctly identify
where the IBM Storwize V3700 is located.
Call Home: When Call Home is configured, the IBM Storwize V3700 automatically
creates a Support Contact with one of the following email addresses, depending on
country or region of installation:
US, Canada, Latin America, and Caribbean Islands: callhome1@de.ibm.com
All other countries or regions: callhome0@de.ibm.com

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The next window allows you to enter the contact details of the main storage administrator,
as shown in Figure 2-25. You can choose to enter the details for a 24-hour operations
desk. These details also are sent with any Call Home, which allows IBM Support to
contact the correct people quickly to process any issues.
Figure 2-25 Contact details
The next window shows the details of the email server. To enter more than one email
server, click the green
+
icon, as shown in Figure 2-26 on page 57.
Important: Unless the IBM Storwize V3700 is in the US the state or province box
should be filled with XX. Follow the instructions for correct entries for locations inside
the US.

Chapter 2. Initial configuration
57
Figure 2-26 Email server details
The IBM Storwize V3700 also has the option to configure local email alerts. These can be
sent to a storage administrator or to an email alias for a team of administrators or
operators. To add more than one recipient, click the green
+
icon, as shown in
Figure 2-27.
Figure 2-27 Event notification

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Click Apply and Next to show the summary window for the call home options, as shown in
Figure 2-28.
Figure 2-28 Call home summary
Click Apply and Next to move onto Configure Storage.
8.The initial configuration wizard moves on to the Configure Storage option next. This option
takes all of the disks in the IBM Storwize V3700 and automatically configures them into
optimal RAID arrays for use as MDisks. If you do not want to automatically configure disks
now, select No and you exit the wizard to the IBM Storwize V3700 GUI, as shown in
Figure 2-29 on page 59.

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59
Figure 2-29 Configure Storage option
Select Yes and click Next to move to the summary window that shows the RAID configuration
that the IBM Storwize V3700 implements, as shown in Figure 2-30.
Figure 2-30 Storage Configuration Summary
The storage pool is created when you click Finish. Depending on the disks available, this
process might take some time to complete as a background task.

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Closing the task box completes the Initial Configuration wizard. From the GUI, select the
Overview option, as shown in Figure 2-31.
Figure 2-31 Overview menu option

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61
From the Overview, you can select the Suggested Tasks, as shown in Figure 2-32.
Figure 2-32 Suggested tasks
From here you can configure host access, iSCSI, create volumes, call home (if it has not
already been done through the setup wizard) and configure remote access authentication.
More information about each of these tasks can be found later in this publication.
2.9.1 Adding enclosures after initial configuration
When the initial installation of the IBM Storwize V3700 is complete, all expansion enclosures
that were purchased at that time should be installed as part of the initial configuration. This
process enables the system to make the best use of the enclosures and drives that you have.
If you are expanding the IBM Storwize V3700 after the initial installation by adding expansion
enclosures, follow the physical installation procedures as described in IBM Storwize V3700
Quick Installation Guide Version, GC27-4219. After the hardware is installed, cabled, and
powered on, complete the following steps to add an expansion enclosure:
1.In the Monitoring tab, select System details  Actions  Add Expansion Enclosure,
as shown in Figure 2-33 on page 62.

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Figure 2-33 Adding new expansion enclosure
2.A message appears that informs you to check and confirm cabling and power to the new
expansion enclosure. Click Next to continue, as shown in Figure 2-34.
Figure 2-34 Expansion enclosure cable check

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63
3.A task runs and completes to discover the new hardware, as shown in Figure 2-35. Click
Close to continue.
Figure 2-35 New enclosure discovery task
4.A window opens that shows the details of the new hardware to be added, as shown in
Figure 2-36 on page 64. There is an option to identify the new enclosure by flashing the
identify light and another option to view the SAS chain that relates to the enclosure.

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Figure 2-36 New hardware to be added

Chapter 2. Initial configuration
65
5.To add the enclosure, highlight it and click Finish, as shown in Figure 2-37.
Figure 2-37 Highlight the new expansion enclosure

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6.The new expansion enclosure now shows up as part of the cluster that is attached to the
control enclosure, as shown in Figure 2-38.
Figure 2-38 The new enclosure as part of the cluster
For more information about how to provision the new storage in the expansion enclosure, see
Chapter 7, “Storage pools” on page 313.
2.9.2 Configure Call Home, email alert, and inventory
If your system is under warranty or you have a hardware maintenance agreement, it is
recommended to configure your system to send email reports to IBM if an issue that requires
hardware investigation is detected. This feature is known as Call Home and is typically
configured during the Initial Configuration of the system as described in item 7 on page 54
To configure the Call Home and email alert event notification in IBM Storwize V3700 after the
Initial Configuration, complete the following steps:
1.Go to Settings  Event Notifications, as shown in Figure 2-39 on page 67.

Chapter 2. Initial configuration
67
Figure 2-39 Enabling Call Home

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2.Go to Email  Enable Email Event Notification, as shown in Figure 2-40.
Figure 2-40 Selecting Event Notification

Chapter 2. Initial configuration
69
The wizard that is used to configure Call Home starts, as shown in Figure 2-41.
Figure 2-41 Call Home wizard
3.You are prompted to enter the system details, contact details, event notification details,
and email server details, as previously shown in Figure 2-23 on page 54, Figure 2-24 on
page 55, Figure 2-25 on page 56, Figure 2-26 on page 57, Figure 2-27 on page 57, and
Figure 2-28 on page 58.
2.9.3 Service Assistant tool
The IBM Storwize V3700 is initially configured with three IP addresses: one service IP
address for each node canister and a management IP address, which is set when the cluster
is started.
The following methods are available to configure the IBM Storwize V3700 system:
The Inittool Program, as described in 2.8, “First-time setup” on page 41.
The Service Assistant tool, which is described next.
Additionally, the Management IP and Service IP addresses can be changed within the GUI,
as described in Chapter 3, “Graphical user interface overview” on page 73.

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The Service Assistant (SA) tool is a web-based GUI that is used to service individual node
canisters, primarily when a node has a fault and is in a service state. A node cannot be active
as part of a clustered system while it is in a service state. The SA is available even when the
management GUI is not accessible. The following information and tasks are included:
Status information about the connections and the node canister.
Basic configuration information, such as configuring IP addresses.
Service tasks, such as restarting the common information model object manager
(CIMOM) and updating the worldwide node name (WWNN).
Details about node error codes and hints about what to do to fix the node error.
The Service Assistance GUI is available by using a service assistant IP address on each
node. The SA GUI is accessed through the cluster IP addresses by appending service to the
cluster management URL. If the system is down, the only other method of communicating
with the node canisters is through the SA IP address directly. Each node can have a single
SA IP address on Ethernet port 1. It is recommended that these IP addresses are configured
on all IBM Storwize V3700 node canisters.
The default IP address of canister 1 is 192.168.70.121, with a subnet mask of 255.255.255.0.
The default IP address of canister 2 is 192.168.70.122, with a subnet mask of 255.255.255.0.
To open the SA GUI, enter one of the following URLs into any web browser:
http(s)://cluster IP address of your cluster/service
http(s)://service IP address of a node/service
Fro example:
Management address: http://1.2.3.4/service
SA access address: http://1.2.3.5/service
Important: The Service Assistant Tool can be accessed only by using the superuser
account.

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When you are accessing SA by using the <cluster address>/service, the configuration node
canister SA GUI login window opens, as shown in Figure 2-42.
Figure 2-42 Service Assistant Login
The SA interfaces can view status and run service actions on other nodes, in addition to the
node where user is connected.

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After you are logged in, you see the Service Assistant Home window, as shown in
Figure 2-43.
Figure 2-43 Service Assistant Home Window
The Current canister node is displayed in the upper left corner of the GUI. As shown in
Figure 2-43, this is node 2. To change the canister, select the relevant node in the Change
Node section of the window. You see the details in the upper left change to reflect the new
canister.
The SA GUI provides access to service procedures and shows the status of the node
canisters. It is recommend that these procedures should only be carried out if directed to do
so by IBM Support.
For more information about how to use the SA tool, see this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Ftbrd_sagui_1938wd.html

© Copyright IBM Corp. 2013. All rights reserved.
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Chapter 3.
Graphical user interface
overview
This chapter provides an overview of the IBM Storwize V3700 graphical user interface (GUI)
and shows how to navigate the configuration panels.
This chapter includes the following topics:
Getting started
Navigation
Status Indicators menus
Function Icon menus
Management GUI help
3

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3.1 Getting started
This section provides information about accessing the IBM Storwize V3700 management
GUI. It covers topics such as supported browsers, log in modes, and the layout of the
Overview panel.
3.1.1 Supported browsers
The IBM Storwize V3700 management software is a browser-based GUI. It is designed to
simplify storage management by providing a single point of control for monitoring,
configuration, and management. Table 3-1 lists the web browsers that are supported by the
management GUI. For the latest version of this table, see IBM Storwize V3700 Quick
Installation Guide, GC27-4219-00.
Table 3-1 Supported web browsers
Browser Supported versions
Mozilla Firefox 3.5 or later
Microsoft Internet Explorer 8.0 or later
Important: The web browser requirements, recommended configuration settings to
access the IBM Storwize V3700 management GUI, and the IBM Storwize V3700 Quick
Installation Guide, GC27-4219 can be found in the IBM Storwize V3700 Information Center
at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp

Chapter 3. Graphical user interface overview
75
3.1.2 Access the management GUI
To log in to the management GUI, open a supported web browser and enter the management
IP address or Hostname of the IBM Storwize V3700. The login panel is displayed, as shown
in Figure 3-1.
Figure 3-1 IBM Storwize V3700 login panel
Default user name and password: Use the following information to log in to the IBM
Storwize V3700 storage management:
User name: superuser
Password: passw0rd (a zero replaces the letter O)

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A successful login shows the Overview panel by default, as shown in Figure 3-2. Alternatively,
the last opened window from the previous session is displayed.
Figure 3-2 IBM Storwize V3700 overview panel
Figure 3-1 on page 75 shows the IBM Storwize V3700 login panel and the option to enable
low graphics mode. This feature can be useful for remote access over narrow bandwidth links.
The Function Icons no longer enlarge and list the available functions. However, navigation is
achieved by clicking a Function Icon and by using the breadcrumb navigation aid.
For more information about the Function Icons, see 3.1.3, “Overview panel layout” on
page 78.
For more information about the breadcrumb navigation aid, see 3.2.3, “Breadcrumb
navigation aid” on page 84. Figure 3-3 shows the management GUI in low graphics mode.

Chapter 3. Graphical user interface overview
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Figure 3-3 Management GUI low graphics mode

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3.1.3 Overview panel layout
As shown in Figure 3-4, the Overview panel has three main sections: Function Icons,
Extended Help, and Status Indicators.
Figure 3-4 The three main sections of the IBM Storwize V3700 overview panel
The Function Icons section shows a column of images. Each image represents a group of
interface functions. The icons enlarge with mouse hover and show the following menus:
Home
Monitoring
Pools
Volumes
Hosts
Copy Services
Access
Settings
The Extended Help section has a flow diagram that shows the available system resources.
The flow diagram is consists of system resource images and green arrows. The images
represent the physical and logical elements of the system. The green arrows show the order
to perform storage allocation tasks and highlight the various logical layers between the
physical internal disks and the logical volumes.
Clicking the objects in this area shows more information. This information provides Extended
Help references, such as the online version of the Information Center and e-Learning
modules. This information also provides direct links to the various configuration panels that
relate to the highlighted image.

Chapter 3. Graphical user interface overview
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The

Status Indicators section shows the following horizontal status bars:
Allocated: Status that is related to the storage capacity of the system.
Running Tasks: Status of tasks that are running and the recently completed tasks.
Health Status: Status relating to system health, which is indicated by using the following
color codes:
– GreenHealthy
– YellowDegraded
– RedUnhealthy
Hovering the mouse pointer and clicking the horizontal bars provides more information and
menus, which is described in 3.3, “Status Indicators menus” on page 94.
3.2 Navigation
Navigating the management GUI is simple and like most systems, there are many ways to
navigate. The two main methods are to use the Function Icons section or the Extended Help

section of the Overview panel. For more information about these sections, see 3.1.3,
“Overview panel layout” on page 78.
This section describes the two main navigation methods and introduces the well-known
breadcrumb navigation aid and the Suggested Tasks aid. Information regarding the
navigation of panels with tables also is provided.

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3.2.1 Function icons navigation
Hovering the mouse pointer over one of the eight function icons on the left side of the panel
enlarges the icon and provides a menu with which to access various functions. Move the
pointer to the required function and click the function. Figure 3-5 shows the results of
hovering the mouse pointer over a function icon.
Figure 3-5 Hovering the pointer over a function icon

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Figure 3-6 shows all of the menus with options under the Function Icons section.
Figure 3-6 Options listed under Function Icons
3.2.2 Extended help navigation
Selecting an image in the flow diagram of the Extended Help section in the Overview panel
shows information beneath the flow diagram. This information contains links to e-Learning
modules and configuration panels that are related to the selected image. This feature is
convenient when the system is implemented because it is possible to work from left to right,
following the flow, and select each object in order. Figure 3-7 on page 82 shows the selection
of Internal Drives in the flow diagram. The information below the flow diagram now relates to
the internal storage.

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Figure 3-7 Navigating GUI with the extended help section
To access the e-Learning modules, click Need Help. To configure the internal storage, click
Pools. Figure 3-8 shows the selection of Pools in the Extended Help section, which opens the
Internal Storage panel.
Figure 3-8 Using the extended help section

Chapter 3. Graphical user interface overview
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Figure 3-9 shows the Internal Storage panel, which is shown because Pools was selected in
the information area of the Extended Help section.
Figure 3-9 The internal storage configuration panel

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3.2.3 Breadcrumb navigation aid
The IBM Storwize V3700 panels use the breadcrumb navigation aid to show the trail that was
browsed. This breadcrumb navigation aid is in the top area of the panel and includes a
System menu on the last breadcrumb. Figure 3-10 shows the breadcrumb navigation aid for
the System panel.
Figure 3-10 Breadcrumb navigation aid
3.2.4 Suggested Tasks aid
The Suggested Tasks feature is a navigation and configuration aid that is in the top area of
the Overview panel. The list of suggested tasks changes, depending on the configuration of
the system. This aid can be useful to follow during the system installation process.
Figure 3-11 on page 85 shows the Suggested Tasks navigation and configuration aid.

Chapter 3. Graphical user interface overview
85
Figure 3-11 Suggested Tasks navigation and configuration aid
3.2.5 Presets
The management GUI contains a series of preestablished configuration options that are
called presets that use commonly used settings to quickly configure objects on the system.
Presets are available for creating volumes, IBM FlashCopy mappings and for setting up a
RAID configuration. Figure 3-12 on page 86 shows the available internal storage presets.

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Figure 3-12 Internal Storage preset selection

Chapter 3. Graphical user interface overview
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3.2.6 Access actions
The IBM Storwize V3700 functional panels provide access to a range of actions that can be
performed, such as: modify attributes and rename, add, or delete objects. The available
actions menus can be accessed by two main methods: highlight the resource and use the
Actions drop box (as shown in Figure 3-13), or right-click the resources, as shown in
Figure 3-14.
Figure 3-13 Actions menu
Figure 3-14 Right-clicking the Actions menu

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3.2.7 Task progress
An action starts a running task and shows a task progress box, as shown in Figure 3-15. Click
Details to show the underlying Command-line Interface (CLI) commands. The commands are
highlighted in blue and can be cut and pasted into a configured IBM Storwize V3700 SSH
terminal session, if required. This ability can be helpful when developing CLI scripts.
Figure 3-15 Task progress box
3.2.8 Navigating panels with tables
Many of the configuration and status panels show information in a table format. This section
describes the following useful methods to navigate panels with rows and columns:
Sorting columns
Reordering columns
Adding or removing columns
Multiple selections
Filtering objects
Sorting columns
Columns can be sorted by clicking the column heading. Figure 3-16 on page 89 shows the
result of clicking the heading of the Slot ID column. The table is now sorted and lists Slots IDs
in descending order.

Chapter 3. Graphical user interface overview
89
Figure 3-16 Sorting columns by clicking the column heading
Reordering Columns
Columns can be reordered by dragging the column to the required location. Figure 3-17
shows the location of the column with the heading Slot ID positioned between the headings
MDisk Name and Enclosure ID. Dragging this heading reorders the columns in the table.
Figure 3-17 Reordering columns

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Figure 3-18 shows the column heading Slot ID being dragged to the required location.
Figure 3-18 Dragging a column heading to the required location
Figure 3-19 shows the result of dragging the column heading Slot ID to the new location.
Figure 3-19 Reordering column headings
Adding or removing columns
To add or remove a column, right-click the heading bar and select the required column
headings by selecting the tick box that is next to the heading name. Figure 3-20 on page 91
shows the addition of the column heading Technology Type.

Chapter 3. Graphical user interface overview
91
Figure 3-20 Adding column heading Technology Type
Multiple selections
By using the management tool, you also can select multiple items in a list by using a
combination of the Shift or Ctrl keys.
Using the Shift key
To select multiple items in a sequential order, click the first item that is listed, press and hold
the Shift key, and then click the last item in the list. All of the items in between the first and last
items are selected, as shown in Figure 3-21.
Figure 3-21 Selection of three sequential items
Important: Some users might encounter a problem where a context menu from the Firefox
browser is shown by right-clicking to change the column heading. This issue can be fixed
by clicking in Firefox: Tools  Options  Content  Advanced (for Java setting) 
Select: Display or replace context menus
The web browser requirements and recommended configuration settings to access the
IBM Storwize V3700 management GUI can be found in the IBM Storwize V3700
Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp

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Using the Ctrl key
To select multiple items that are not in sequential order, click the first item, press and hold the
Ctrl key, and click the other items that you require. Figure 3-22 shows the selection of two
non-sequential items.
Figure 3-22 Selection of two non-sequential items: Part 1
Figure 3-23 shows the result of the use of the Ctrl key to select multiple non-sequential items.
Figure 3-23 Selection of two non-sequential items: Part 2
Filtering objects
To focus on a subset of the listed items that are shown in a panel with columns, use the filter
field, which is found at the upper right side of the table. This tool shows items that match the
required value. Figure 3-24 shows the text bvol was entered into the filter field. Now, only
volumes with the text bvol in any column are listed and the filter word also is highlighted.
Figure 3-24 Filtering objects to display a subset of the volumes

Chapter 3. Graphical user interface overview
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Filter by column
Click the magnifying glass that is next to the filter field to activate the filter by column feature.
Figure 3-25 shows the Filter by Column drop-down menu. This feature allows the filter field
value to be matched to a specific column. Figure 3-26 shows the column filter is set to Host
Mappings and the filter value set to Yes and the resulting Volumes with Hosts mapped.
.
Figure 3-25 Filter by column
Figure 3-26 Choosing the filter value

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3.3 Status Indicators menus
This section provides more information about the horizontal bars that are shown at the bottom
of the management GUI panels. The bars are
status indicators
, and include associated bar
menus. This section describes the Allocated, Running Tasks, and Health Status bar menus.
3.3.1 Horizontal bars
As described in 3.1.3, “Overview panel layout” on page 78, the status indicators include the
allocated, running tasks, and health status horizontal bars and are shown at the bottom of the
panel. The status indicators are color-coded and draw attention to alerts, events, and errors.
Hovering over and clicking the bars shows more menus.
3.3.2 Allocated status bar menu
The allocated status bar shows capacity status. Hovering over the image of two arrows on the
right side of the Allocated status bar shows a description of the allocated menu comparison
that is in use. Figure 3-27 shows the comparison of the used capacity to the real capacity.
Figure 3-27 Allocated bar, comparing used capacity to real capacity

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To change the allocated bar comparison, click the image of two arrows on the right side of the
Allocated status bar. Figure 3-28 shows the new comparison, virtual capacity to real capacity.
Figure 3-28 Changing the allocated menu comparison, virtual capacity to real capacity

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3.3.3 Running tasks bar menu
To show the Running Tasks bar menu, click the circular image at the left of the running tasks
status bar. This menu lists running and recently completed tasks and groups similar tasks.
Figure 3-29 shows the Running Tasks menu.
Figure 3-29 Running Tasks menu
For an indication of task progress, browse to the Running Tasks bar menu and click the task.
Figure 3-30 shows the selection of a task from the Running Tasks menu.
Figure 3-30 Selecting a task from the Running Task menu for and indication of task progress
Figure 3-31 on page 97 shows the Recently Completed tasks.

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Figure 3-31 Recently Completed tasks
3.3.4 Health status bar menu
The health status bar provides an indication of the overall health of the system. The following
color of the status bar indicates the state of IBM Storwize V3700:
Green: Healthy
Yellow: degraded
Red: Unhealthy
If a status alert occurs, the health status bar can turn from green to yellow, or red. To show the
health status menu, click the attention icon on the left side of the health status bar.
Figure 3-32 shows the revealed health status menu.
Figure 3-32 Health status menu

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In Figure 3-33, the health status bar menu shows that the system as Degraded status and
provides a description of Internal Storage for the type of event that occurred. To investigate
the event, open the health status bar menu and click the description of the event, as shown in
Figure 3-33.
Figure 3-33 Status and description of an alert via the health status menu
Click the description of the event in the health status menu to show the Events panel
(Monitoring  Events), as shown in Figure 3-34. This panel lists all events and provides
directed maintenance procedures (DMP) to help resolve errors. For more information, see
“Events panel” on page 105.
Figure 3-34 Events panel via health status menu

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3.4 Function Icon menus
The IBM Storwize V3700 management GUI provides Function Icons that are an efficient and
quick mechanism for navigation. As described in section 3.1.3, “Overview panel layout” on
page 78, each graphic on the left side of the panel is a function icon that presents a group of
interface functions. Hovering over one of the eight Function Icons shows a menu that lists the
functions. Figure 3-35 shows all of the Function Icon menus.
Figure 3-35 All function icon menus

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3.4.1 Home menu
The Home menu, as shown in Figure 3-36, provides access to the Overview panel.
Figure 3-36 Home menu
Overview panel
Select Overview in the Home menu to open the panel. For more information, see 3.1.3,
“Overview panel layout” on page 78.
3.4.2 Monitoring menu
The Monitoring menu, as shown in Figure 3-37, provides access to the System, System
Details, Events, and Performance panels.
Figure 3-37 Monitoring menu

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System panel
Select System in the Monitoring menu to open the panel. As shown in Figure 3-38, the
System panel shows capacity usage, enclosures, and all drives in the system.
Figure 3-38 The system panel
Selecting the name and version of the system shows more information that is related to
storage allocation. The information is presented under two tabs: Info and Manage.
Figure 3-39 shows the System panel Info tab.
Figure 3-39 System panel Info tab

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Select the Manage tab to show the name of the system and shutdown and upgrade actions.
Figure 3-40 shows the System panel Manage tab.
Figure 3-40 System panel Manage tab
Selecting a rack-mounted enclosure shows more information. Hovering over a drive shows
the drive status, size, and speed details. Identify starts the blue identification LED on the front
of the enclosure. Click Enclosure 1 to show the System Details panel. For more information,
see “System details panel” on page 103. Figure 3-41 shows the System panel enclosure
view.
Figure 3-41 System panel enclosure view

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System details panel
Select System Details in the Monitoring menu to open the panel. The System Details panel
provides the status and details of the components that make up the system. Figure 3-42
shows the System Details panel.
Figure 3-42 System details panel
Actions and environmental statistics
Actions, such as adding expansion enclosures, viewing the SAS chain connections, and
performing a software upgrade and a system shutdown can be run from the System Details
panel. Information that relates to environmental statistics, such as power consumption and
temperature, is also accessible from this panel. Figure 3-43 on page 104 shows the possible
actions and the environmental statistics of the enclosure.

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Figure 3-43 System details actions and environmental statistics
Node canister information
Node canister information, such as FC and SAS WWPNs and ISCSI IQNs, is useful for host
attachment purposes. This information is shown by clicking the control enclosure node
canister in the System Details panel. Figure 3-44 shows node canister information.
Figure 3-44 Node canister information via system details panel

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Events panel
Select Events in the Monitoring menu to open the panel. The machine is optimal when all
errors are addressed and there are no items that are found in the Events panel. Figure 3-45
shows the Events panel with no recommended actions.
Figure 3-45 Events panel with all errors addressed
Filtering events view
To view Unfixed Messages and Alerts or Show All, select the appropriate option from the
menu next to the filter field. Figure 3-46 shows this menu. For more information, see “Filtering
objects” on page 92.
Figure 3-46 Unfixed Messages and Alerts or the Show All options in the events panel

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Event properties
To show actions and properties that are related to an event, or to repair an event that is not
the Next Recommended Action, right-click the event to show other options. Figure 3-47
shows the selection of the Properties option.
Figure 3-47 Selecting event properties
Figure 3-48 shows the properties of an event.
Figure 3-48 Event properties

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Show events entries within
To show events that occurred within a certain time of a particular event, select the required
event entry, then select Show entries within... from the Actions menu and set the period
value. Figure 3-49 shows the selection of the Show entries within... option with a period
value of 5 minutes. This shows all events within 5 minutes of the selected event.
Figure 3-49 Showing events within a set time
Saving events to a file
It is possible to save the events that are listed in the events panel to a file. To do this, click the
diskette icon and select the format you require to save the file. This results in a
comma-delimited file that can be saved in text format or as a .csv file for input to a
spreadsheet program such as MS Excel.
Figure 3-50 on page 108 shows saving the events as formatted values.

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Figure 3-50 Saving events as formatted values
Performance panel
Select Performance in the Monitoring menu to open the panel. This panel shows graphs that
represent the last 5 minutes of performance statistics. The performance graphs include
statistics that are related to CPU usage, volumes, MDisks, and interfaces. Figure 3-51 shows
the Performance panel.
Figure 3-51 Performance panel

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Custom-tailoring performance graphs
The Performance panel can be customized to show the workload of a single node, which is
useful to help determine whether the system is working in a balanced manner. Figure 3-52
shows the custom-tailoring of the performance graphs by selecting node 1 from the System
Statistics menu. The measurement type can also be changed between throughput (MBps) or
IOPS by selecting the relevant value.
Figure 3-52 Graphs representing performance statistics of a single node
Performance peak value
Peak values over the last 5-minute period can be seen by hovering over the current value, as
shown in Figure 3-53 for CPU usage.
Figure 3-53 Peak CPU usage value over the last 5 minutes

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3.4.3 Pools menu
The Pools menu provides access to the Volumes by Pools, Internal Storage, MDisks by Pools,
and System Migration functions, as shown in Figure 3-54.
Figure 3-54 Pools menu
Volumes by Pool panel
Select Volumes by Pool in the Pools menu to open the panel. By using the Volumes by Pool
panel, you can display volumes using the Pool Filter function. This view makes it easy to
manage volumes and determine the amount of real capacity that is available for more
allocations. Figure 3-55 shows the Volumes by Pool panel.
Figure 3-55 Volumes by pools panel

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Volume allocation
The upper right corner of the Volumes by Pool panel shows the Volume Allocation which, in
this example, shows the physical capacity (8.14TB), the virtual capacity (21.25TB), and the
used capacity (1.65TB in the green portion). The red bar shows the threshold at which a
warning is generated when the used capacity in the pool first exceeds the threshold set for
the physical capacity of the Pool. By default, this threshold is set to 80% but can be altered in
the Pool properties. Figure 3-56 shows the volume allocation information that is displayed in
the Volumes by Pool panel.
Figure 3-56 Volume allocation
Renaming pools
To rename a pool, select the pool from the pool filter and click the name of the pool.
Figure 3-57 shows that pool mdiskgrp1 was renamed to Gold Pool.
Figure 3-57 Renaming a pool

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Changing pool icons
To change the icon that is associated with a pool, select the pool in the pool filter, click the
large pool icon that is above New Volume and Actions, then use the Choose Icon buttons to
select the wanted image. This change helps to manage and differentiate between the classes
of drive or the tier of the storage pool. Figure 3-58 shows the pool change icon panel.
Figure 3-58 Changing the pool icon

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Volume functions
The Volumes by Pool panel also provides access to the volume functions via the Actions
menu, the New Volume option, and by right-clicking a listed volume. For more information
about navigating the Volume panel, see 3.4.4, “Volumes menu” on page 120. Figure 3-59
shows the volume functions that are available via the Volumes by Pool panel.
Figure 3-59 Volume functions are available via the Volume by Pools panel

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Internal storage panel
Select Internal Storage in the Pools menu to open the Internal Storage panel, as shown in
Figure 3-60. The internal storage consists of the drives that are contained in the IBM Storwize
V3700 control enclosure and any SAS-attached IBM Storwize V3700 expansion enclosures.
By using the Internal Storage panel, you can configure the internal storage into RAID
protected storage (MDisks). This panel also allows the displayed drive list to be filtered by
drive class.
Figure 3-60 Drive actions menu of the internal storage panel
Drive actions
Drive level functions, such as identifying a drive, and marking a drive as offline, unused,
candidate, or spare can be accessed here. Right-click a listed drive to show the actions
menu. Alternatively, the drives can be selected and the Action menu is used. For more
information, see “Multiple selections” on page 91. Figure 3-60 shows the drive actions menu.
Drive properties
Drive properties and dependent volumes can be displayed from the Internal Storage panel.
Select Properties from the Disk Actions menu. The drive Properties panel shows drive
attributes and the drive slot SAS port status. Figure 3-61 on page 115 shows the drive
properties with the Show Details option selected.

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Figure 3-61 Drive properties
Configure internal storage wizard
Click Configure Storage to show the Configure Internal Storage wizard, as shown in
Figure 3-62.
Figure 3-62 Internal Storage panel

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By using this wizard, you can configure the RAID properties and pool allocation of the internal
storage. Figure 3-63 shows Step 1 of the Configure Internal Storage wizard.
Figure 3-63 Configure internal storage wizard: Step 1
Figure 3-64 shows Step 2 of the Configure Internal Storage wizard.
Figure 3-64 Configuring internal storage wizard: Step 2
For more information about configuring internal storage, see Chapter 7, “Storage pools” on
page 313.

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MDisks by Pool panel
Select MDisks by Pool in the Pools menu to open the MDisks by Pool panel. By using this
panel, you can perform such tasks as display MDisks in each pool, create pools, delete pools,
and detect externally virtualized storage (for migration). Figure 3-65 shows the MDisks by
Pool panel.
Figure 3-65 MDisks by Pool panel
Pool actions
To delete a pool or change the pool name or icon, right-click the listed pool. Alternatively, the
Actions menu can be used. Figure 3-66 shows the pool actions.
Figure 3-66 Pool actions
RAID actions
By using the MDisks by Pool panel, you can perform MDisk RAID tasks, such as set spare
goal, swap drive, and delete. To access these functions, right-click the MDisk, as shown in
Figure 3-67 on page 118.

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Figure 3-67 RAID actions menu
System Migration panel
Select System Migration in the Pools menu to open the System Migration panel. This panel
is used to migrate data from externally virtualized storage systems to the internal storage of
the IBM Storwize V3700. The panel displays image mode volume information. To begin a
migration, click Start New Migration and the Start Migration wizard is shown. Figure 3-68
shows the System Migration panel.
Figure 3-68 System Migration panel

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Storage Migration wizard
The Storage Migration wizard is used for data migration from other Fibre Channel attached
storage systems to the IBM Storwize V3700. Figure 3-69 shows Step 1 of the Storage
Migration Wizard.
For more information, see Chapter 6, “Storage migration wizard” on page 261.
Figure 3-69 Storage migration wizard

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3.4.4 Volumes menu
As shown in Figure 3-70, the Volumes menu provides access to the Volumes, Volumes by
Pool, and Volumes by host functions.
Figure 3-70 Selection of the volumes menu
Volumes panel
Select Volumes in the Volumes menu to open the panel, as shown in Figure 3-71. The
Volumes panel shows all of the volumes in the system. The information that is displayed is
dependent on the columns that are selected.
Figure 3-71 The volumes panel

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Volume actions
Volume actions such as map, unmap, rename, shrink, expand, migrate to another pool,
delete, and mirror can be performed from this panel.
Create new volumes
Click New Volume to open the New Volume panel, as shown in Figure 3-72. By using this
panel, you can select a preset when a volume is created. The presets are designed to
accommodate most user cases. The presets are generic, thin-provisioned, mirror, or thin
mirror. After a preset is determined, select the storage pool from which the volumes are
allocated. An area to name and size the volumes is shown.
For more information, see Chapter 5, “Basic volume configuration” on page 189 and
Chapter 8, “Advanced host and volume administration” on page 353.
Figure 3-72 New Volume panel
Creating multiple volumes
A useful feature is available for quickly creating multiple volumes of the same type and size.
Specify the number of volumes required in the Quantity field, then complete the volume
capacity and name. A number range can also be specified.
The New Volumes panel displays a summary that shows the real and virtual capacity that is
used if the proposed volumes are created. Click Create or Create and Map to Host to
continue.

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Figure 3-73 shows the quantity of 5 in the Quantity field.
Figure 3-73 Creating multiple volumes quickly
Volume advanced settings
Click Advanced to show more volume configuration options. Use this feature when the preset
does not meet requirements. After the advanced settings are configured, click OK to return to
the New Volumes panel. Figure 3-74 shows the Advanced Settings panel.
Figure 3-74 New volume advanced settings
Volumes by Pool panel
This method is an alternative method to access the volumes by pool panel. For more
information, see “Volumes by Pool panel” on page 110.

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Volumes by Host panel
Select Volumes by Host in the Volumes menu to open the panel. By using the Volume by
Hosts panel, you can focus volumes that are allocated to a particular host by using the host
selection filter.
3.4.5 Hosts menu
As shown in Figure 3-75, the Hosts menu provides access to the Hosts, Ports by Host, Host
Mappings, and Volumes by Host functions.
Figure 3-75 Selecting the Hosts menu

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Hosts panel
Select the Hosts item in the Hosts menu to open the panel, as shown in Figure 3-76. The
Hosts panel shows all of the hosts that are defined in the system.
Figure 3-76 The hosts panel
Host Actions
Host Actions such as Modify Mappings, Unmap All Volumes, Rename, Delete and Properties
can be performed from the Hosts panel. Figure 3-76 shows the actions available from the
Hosts panel.
For more information about the Hosts Actions menu, see Chapter 8, “Advanced host and
volume administration” on page 353.
Creating a new host
Click New Host and the Create Host panel opens. Choose the host type from Fibre Channel
(FC), iSCSI or SAS host and the applicable host configuration panel is shown. After the host
type is determined, the host name and port definitions can be configured. Figure 3-77 on
page 125 shows the Choose the Host Type panel of the Create Host window.
For more information about how to create hosts, see Chapter 4, “Host configuration” on
page 151.

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Figure 3-77 Choose the Host Type panel
Ports by Host panel
Select Ports by Host in the Hosts menu to open the panel, as shown in Figure 3-78. The
panel shows the address, status, and type of ports that are assigned to the host definition.
Actions such as map, unmap, and port deletion can be performed from this panel.
Figure 3-78 Ports by host panel

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Host mappings panel
Select Host Mappings in the Hosts menu to open the panel, as shown in Figure 3-79. This
panel shows the volumes that each host can access with the corresponding SCSI ID. The
Unmap Volume action can be performed from this panel.
Figure 3-79 Host mappings panel
Volumes by Host panel
This panel is an alternative method to access the Volumes by Host panel. For more
information, see “Volumes by Host panel” on page 123.
3.4.6 Copy Services menu
The Copy Services menu provides access to the FlashCopy, Consistency Groups, FlashCopy
Mappings, Remote Copy and Partnership functions. Figure 3-80 on page 127 shows the
Copy Services menu.

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Figure 3-80 Copy services menu
FlashCopy panel
Select FlashCopy in the Copy Services menu to open the panel, as shown in Figure 3-81.
The FlashCopy panel displays all of the volumes in the system.
Figure 3-81 FlashCopy panel

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FlashCopy actions
FlashCopy Actions such as snapshot, clone, backup, target assignment, and deletion can be
performed from this panel. Figure 3-81 on page 127 shows the actions that are available from
the FlashCopy panel.
Consistency Groups panel
Select Consistency Groups in the Copy Services menu to open the panel. A consistency
group is a container for FlashCopy mappings. Grouping allows FlashCopy mapping actions
such as prepare, start, and stop to occur at the same time for the group instead of
coordinating actions individually. This feature can help ensure that the groups target volumes
are consistent to the same point and remove several FlashCopy mapping administration
tasks.
The Consistency Group panel shows the defined groups with the associated FlashCopy
mappings. Group Actions such as FlashCopy Map start, stop, and delete can be performed
from this panel. New FlashCopy Mapping also can be selected from this panel. For more
information, see “FlashCopy mappings panel” on page 128. Figure 3-82 shows the
Consistency Group panel.
For more information about creating and managing consistency groups, see Chapter 8,
“Advanced host and volume administration” on page 353.
Figure 3-82 Consistency groups panel
FlashCopy mappings panel
Select FlashCopy Mappings in the Copy Services menu to open the panel. FlashCopy
mappings define the relationship between source volumes and target volumes. The
FlashCopy Mappings panel shows information that relates to each mapping, such as: status,
progress, source and target volumes, and flash time. Select New FlashCopy Mapping to
configure a new mapping or use the Actions menu to administer the mapping. Figure 3-83 on
page 129 shows the FlashCopy Mappings panel.

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Figure 3-83 FlashCopy Mappings panel
For more information about how to create and administer FlashCopy mappings, see
Chapter 8, “Advanced host and volume administration” on page 353.
Remote Copy panel
Clicking Remote Copy opens the window that is shown in Figure 3-84. This window shows
the existing Remote Copy relationships and allows you to set up and modify consistency
groups. From this window, you can also start and stop relationships, add relationships to a
consistency group, and switch the direction of the mirror.
Figure 3-84 Remote Copy window
For more information, see Chapter 10, “Copy services” on page 449.
Partnerships panel
Clicking Partnerships opens the window that is shown in Figure 3-85 on page 130. This
window allows you to set up a new partnership or delete an existing partnership with another
IBM Storwize or SAN Volume Controller system for the purposes of remote mirroring.

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Figure 3-85 Partnerships window
From this window, you can also set the background copy rate. This rate specifies the
bandwidth, in megabytes per second (MBps), that is used by the background copy process
between the clusters.
For more information, see Chapter 10, “Copy services” on page 449.
3.4.7 Access menu
The Access menu provides access to the Users and Audit Log functions, as shown in
Figure 3-86.
Figure 3-86 Access menu

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Users panel
Select Users in the Access menu to open the panel. The Users panel shows the defined user
groups and users for the system. The users that are listed can be filtered by user group. Click
New User Group to open the Create a New Group panel. Figure 3-87 shows the Users panel
and User actions.
Figure 3-87 Users panel
Creating a user group
By using the New User Group panel, you can configure user groups. Enter the group name,
select the role, then click Create, as shown in Figure 3-88.
Figure 3-88 New user group panel

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Creating a user
Click New User to define a user to the system. Figure 3-89 shows the Users panel and the
New User option.
Figure 3-89 Users panel and the new user option
By using the New User panel, you can configure the user name, password, and
authentication mode. It is essential to enter the user name, password, group, and
authentication mode. The public Secure Shell (SSH) key is optional. After the user is defined,
click Create.
The authentication mode can be set to local or remote. Select local if the IBM Storwize V3700
performs the authentication locally. Select remote if a remote service such as an LDAP server
authenticates the connection. If remote is selected, the remote authentication server must be
configured in the IBM Storwize V3700 by clicking Settings menu  Directory Services
panel.

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The SSH configuration can be used to establish a more secure connection to the
command-line interface. See Appendix A, “Command-line interface setup and SAN Boot” on
page 593 for more information about how to set up SSH keys.
Figure 3-90 shows the New User panel.
Figure 3-90 New user panel
Audit log panel
Select Audit Log in the Access menu to open the panel. The audit log tracks action
commands that are issued through a CLI session or through the management GUI. The Audit
Log panel displays information about the command, such as the user, time stamp, and any
associated command parameters. The log can be filtered by date or by the Show entries
within... feature to reduce the number of items that are listed. It is not possible to delete or
alter the Audit log. Figure 3-91 shows the Audit Log panel.
Figure 3-91 Audit log panel

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3.4.8 Settings menu
The Setting menu provides access to the Event Notifications, Directory Services, Network,
Support, and General functions. Figure 3-92 shows the Settings menu.
Figure 3-92 Settings menu
Event notifications panel
Select Event Notifications in the Settings menu to open the panel. The IBM Storwize V3700
can use Simple Network Management Protocol (SNMP) traps, syslog messages, emails, and
IBM Call Home to notify users when events are detected. Each event notification method can
be configured to report all events or alerts. Alerts are the significant events and might require
user intervention. The event notification levels are critical, warning, and information.
The Event Notifications panel provides access to the Email, SNMP, and Syslog configuration
panels. IBM Call Home is an email notification for IBM Support. It is automatically configured
as an email recipient and is enabled when Email event notification is enabled by following the
Call Home wizard.
Enabling email event notification
Click Enable Email Event Notification to open the Call Home wizard. Figure 3-93 on
page 135 shows the Event Notifications Email configuration panel.

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Figure 3-93 Event notification panel
Call Home wizard
The Call Home wizard, as shown in Figure 3-94, guides the user through account contact and
machine location entry, and email configuration activities.
For more information about running the Call Home wizard, see 2.9.2, “Configure Call Home,
email alert, and inventory” on page 66.
Figure 3-94 Call home wizard

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SNMP event notification
As shown in Figure 3-95, the Event Notifications panel provides access to the SNMP
configuration panel. Click SNMP to open the panel, then enter the server details. Multiple
servers can be configured by clicking
+
to add more servers.
Figure 3-95 SNMP configuration panel
Syslog event notification
The Event Notifications panel provides access to Syslog configuration panel. Click Syslog to
open the panel, then enter the server details. Multiple servers can be configured by clicking
+
to add more servers. Figure 3-96 shows the Syslog configuration panel.
Figure 3-96 Syslog configuration panel

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Directory Services panel
Select Directory Services in the Settings menu to open the panel. The Directory Services
panel provides access to the Remote Authentication wizard. Remote authentication must be
configured to create remote users on the IBM Storwize V3700. A remote user is authenticated
on a remote service, such as IBM Tivoli® Integrated Portal or a Lightweight Directory Access
Protocol (LDAP) provider.
Enable remote authentication
Click Configure Remote Authentication to open the wizard. Figure 3-97 shows the
Directory Services panel.
Figure 3-97 Directory Services panel

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Network panel
Select Network in the General menu to open the panel. The Network panel, as shown in
Figure 3-98, provides access to the Management IP Addresses, Service IP Addresses,
iSCSI, and Fibre Channel configuration panels.
Figure 3-98 Network panel
Management IP addresses
The Management IP Address is the IP address of the system and is configured during initial
setup. The address can be an IPv4 address, IPv6 address, or both. The Management IP
address is logically assigned to Ethernet port 1 of each node canister, which allows for node
canister failover.
Another Management IP Address can be logically assigned to Ethernet port 2 of each node
canister for more fault tolerance. If the Management IP address is changed, use the new IP
address to log in to the Management GUI again. Click Management IP Addresses and then
click the port you want to configure (the corresponding port on the partner node canister is
also highlighted). Figure 3-99 on page 139 shows Management IP Addresses configuration
panel.

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Figure 3-99 Management IP Addresses configuration panel
Service IP Addresses
Service IP addresses are used to access the Service Assistant. The address can be an IPv4
address, IPv6 address, or both. The Service IP addresses are configured on Ethernet port 1
of each node canister. Click Service IP addresses and the select the Control Enclosure
and Node Canister to configure. Figure 3-100 on page 140 shows the Service IP addresses
configuration panel.
For more information, see 2.9.3, “Service Assistant tool” on page 69.

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Figure 3-100 Service IP Addresses configuration panel
iSCSI connectivity
The IBM Storwize V3700 supports iSCSI connections for hosts. Click iSCSI and select the
node canister to configure the iSCSI IP addresses. Figure 3-101 on page 141 shows the
iSCSI configuration panel.

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Figure 3-101 iSCSI Configuration panel
Fibre Channel connectivity
The Fibre Channel panel displays Fibre Channel connections that are established between
the IBM Storwize V3700 node canisters, other storage systems and hosts. Click Fibre
Channel and select the required view from the View connectivity for: drop-down menu.
Figure 3-102 shows the Fibre Channel panel with All nodes, storage systems, and hosts
selected.
Figure 3-102 Fibre Channel panel

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Support panel
Select Support in the Settings menu to open the panel. As shown in Figure 3-103, the
Support panel provides access to the IBM support package, which is used by IBM to assist
with problem determination. Click Download Support Package to access the wizard.
Figure 3-103 Support panel
Download support package wizard
The Download Support Package wizard provides various package types. IBM support
provides direction on package type selection as required. To download the package, select
the type and click Download. The output file can be saved to the users workstation.
Figure 3-104 shows the Download Support Package wizard.
Figure 3-104 Download Support Package wizard

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Show full log listing...
The Support panel also provides access to the files that are on the node canisters, as shown
in Figure 3-103. Click Show full log listing... to access the node canister files. To save a file
to the user’s workstation, select a file, right-click the file and select Download. To change to
the file listing to show the files on a partner node canister, select the node canister from the
menu that is next to the panel filter. Figure 3-105 shows the full log listing.
Figure 3-105 Full log listing
General panel
Select General in the Settings menu to open the panel. The General panel provides access
to the Date and Time, Licensing, Upgrade Machine Code, and GUI Preferences configuration
panels. Figure 3-106 shows the General panel.
Figure 3-106 General panel

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Date and time
Click Data and Time to configure date and time manually or via Network Time Protocol (NTP)
server. Figure 3-106 on page 143 shows the Date and Time function of the General panel.
Licensing
The licensing panel shows the current system licensing. The IBM Storwize V3700 is based on
per system licensing and is not licensed per enclosure as other systems in the Storwize
family.
The following optional licenses are available:
FlashCopy upgrade to 2040 target copies
Remote Copy
Easy Tier
Turbo Performance
One-time trial licenses can be enabled for any function except the FlashCopy upgrade from
the GUI. The trial licenses automatically disable after 90 days if not fully licensed in the
meantime.
IBM ships a printed page with an authorization code when the optional license is ordered.
The following options are available for enabling the licenses:
Automatic: The client enters an authorization code into the GUI of an internet-attached
IBM Storwize V3700, the system validates the code with IBM and enables function.
Manual: The client enters an authorization code and machine details into the Data Storage
Feature Activation (DSFA) website, which validates and creates a license key. The client
enters the license key into the IBM Storwize V3700 GUI, which enables the function.
For more information, see the DSFA website at:
https://www-03.ibm.com/storage/dsfa/storwize/selectMachine.wss
The authorization code can be used only once and the license key is specific to one machine.
Licenses cannot be transferred between systems and if the system is sold, license ownership
transfers with it.
Figure 3-107 on page 145 shows the Licensed Functions panel within the General panel. The
licenses can be activated by right-clicking the function and selecting the required activation
method.

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Figure 3-107 Licensed functions
Upgrade machine code
IBM recommends that you use the latest version of machine code. The Upgrade Machine
Code panel shows the current machine code level. If the system is connected to the internet,
it contacts the IBM upgrade server to check whether the current level is the latest level. If an
update is available, a direct link to the code is provided to the make code download process
easier.
To upgrade the code, the IBM Storwize V3700 code and the IBM Storwize V3700 Upgrade
Test Utility must be downloaded. After the files are downloaded, it is best to check the MD5
checksum to ensure that the files are sound. Read the release notes, verify compatibility, and
follow all IBM recommendations and prerequisites. To upgrade the machine code of the IBM
Storwize V3700, click Launch Upgrade Wizard. After the upgrade starts, an Abort button is
shown that can be used to stop the upgrade process. Figure 3-108 shows the Upgrade
Machine Code panel.
Figure 3-108 Upgrade machine code panel
For more information, see 11.4, “Software upgrade” on page 564.

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GUI Preferences
By using the GUI Preferences panel (as shown in Figure 3-109), you can refresh GUI objects,
restore default browser preferences, set table selection policy, and configure the Information
Center web address.
Figure 3-109 GUI Preferences panel

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3.5 Management GUI help
This section provides information about the various methods that are available to get help
while you use the IBM Storwize V3700 management GUI. The following topics are included in
this section:
IBM Storwize V3700 Information Center
e-Learning modules
Embedded panel help
Question mark help
Hover help
IBM endorsed YouTube videos
3.5.1 IBM Storwize V3700 Information Center
The best source of information for the IBM Storwize V3700 is the Information Center. Click
Visit the Information Center for direct access to the online version from the Overview panel,
as shown in Figure 3-110.
Figure 3-110 Overview panel Information Center link
3.5.2 Watching an e-Learning videos
The IBM Storwize V3700 provides embedded e-Learning videos to watch. The videos provide
easy-to-follow directions to complete various tasks. Click Watch e-Learning:... to start the
video, as shown in Figure 3-111.
Figure 3-111 Watch e-Learning module

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3.5.3 Learning more
The IBM Storwize V3700 provides embedded Need Help links to explain important concepts
and panels. Click Need Help to open the information panel, as shown in Figure 3-112.
Figure 3-112 Need Help link
Figure 3-113 shows the information panel.
Figure 3-113 Information panel
3.5.4 Embedded panel help
The IBM Storwize V3700 provides embedded help that is available on each panel. Click Help
to open the information panel, as shown in Figure 3-114.
Figure 3-114 Embedded panel help

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Figure 3-115 shows the information panel that is opened from the embedded panel help. The
information panel includes hotlinks to various other panels, including the Information Center.
Figure 3-115 Information panel
3.5.5 Hidden question mark help
The IBM Storwize V3700 provides a hidden question mark help feature for some settings or
items that are found in various configuration panels. This help feature is accessed by hovering
next to an item where the question mark is shown and the help bubble is displayed, as shown
in Figure 3-116.
Figure 3-116 Hidden question mark help
3.5.6 Hover help
The IBM Storwize V3700 provides hidden help tags that are shown when you hover over
various functions and items, as shown in Figure 3-117.
Figure 3-117 Hover help

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3.5.7 IBM endorsed YouTube videos
IBM endorses various YouTube videos for the IBM storage portfolio. Client feedback suggests
that these videos are a good tool to show management GUI navigation and tasks. Check for
new videos from IBM Storage to find useful information at the IBM System Storage Channel
at this website:
https://www.youtube.com/user/ibmstoragevideos

© Copyright IBM Corp. 2013. All rights reserved.
151
Chapter 4.
Host configuration
This chapter provides an overview on how to set up Open System hosts in the context of IBM
Storwize V3700. It also describes how to use the IBM Storwize V3700 GUI to create hosts
connections to access Storage Disk Subsystem volumes. For more information about volume
administration, see Chapter 5, “Basic volume configuration” on page 189.
This chapter includes the following sections:
Host attachment overview
Preparing the host operating system
Configuring hosts on IBM Storwize V3700
4

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4.1 Host attachment overview
A host system is an open-systems computer that is connected to a switch through a Fibre
Channel or iSCSI interface. As IBM Storwize V3700 is geared towards small to medium scale
data center storage solutions, a direct-attached Serial Attached SCSI (SAS) interface is also
supported.
IBM Storwize V3700 supports the following host attachment protocols:
8 Gb Fibre Channel Protocol or 10Gb iSCSI /FCoE (optional host interface)
6 Gb SAS (Serial Attached SCSI) Protocol (standard host interface)
1 Gb iSCSI (standard host interface)
In this chapter, we assume that your hosts are physically ready and attached to your
FC/FCoE and IP network, or directly attached if SAS Host Bus Adapters (HBAs) are used and
that you have completed the steps that are described in 2.9, “Initial configuration” on page 50.
Follow basic switch and zoning recommendations and ensure that each host has at least two
network adapters, that each adapter is on a separate network (or at minimum in a separate
zone), and connection to both canisters exists. This setup assures four paths for failover and
failback purposes. For SAS connection, ensure that each host has at least two SAS HBA
connections to each IBM Storwize V3700 canister for resiliency purposes.
Before new volumes are mapped on the host of your choice, some preparation goes a long
way towards ease of use and reliability. There are several steps that are required on a host
system to prepare for mapping new IBM Storwize V3700 volumes. Use the System Storage
Interoperation Center (SSIC) to check which code levels are supported to attach your host to
your storage. SSIC is an IBM web tool that checks the interoperation of host, storage,
switches, and multipathing drivers. For the latest IBM Storwize V3700 compatibility
information, see SSIC at this website:
http://ibm.com/systems/support/storage/ssic/interoperability.wss
The complete support matrix is published in the IBM Storwize V3700 Supported Hardware
List, Device Driver, Firmware, and Recommended Software Levels V7.1 document, which is
available at this website:
http://www.ibm.com/support/docview.wss?uid=ssg1S1004388
This chapter focuses on Windows and VMware. If you must attach any other hosts, for
example, IBM AIX®, Linux, or even an Apple system, you can find the required information in
the IBM Storwize V3700 Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp

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4.2 Preparing the host operating system
In this section, we describe how to prepare Microsoft Windows and VMware host side
attachment that is required to use an IBM Storwize V3700 with Fibre Channel, iSCSI, or SAS
connectivity.
4.2.1 Windows 2008 R2: Preparing for Fibre Channel attachment
Complete the following steps to prepare a Windows 2008 (R2) host to connect to an IBM
Storwize V3700 using Fibre Channel:
1.Make sure that the latest OS Service Pack, updates, and hotfixes are applied to your
Microsoft server.
2.Use the latest firmware and driver levels on your host system.
3.Install the host bus adapters (HBAs) on the Windows server by using the latest BIOS.
4.Connect the FC Host Adapter ports to the switches by using Fibre Optic Cables.
5.Configure the switches (SAN Zoning).
6.Configure the HBA parameters, if necessary.
7.Set the Windows timeout value.
8.Install the multipath Driver Device Module software.
Downloading and installing the supported drivers and firmware
Install a supported HBA driver for your configuration. Use the Windows Device Manager or
vendor tools, such as SANsurfer for QLogic product, HBAnyware for Emulex, or Brocade HBA
Software Installer to install the driver. Also, check and update the BIOS (firmware) level of the
HBA by using the manufacturer’s provided tools. Always check the readme file to see whether
there are Windows registry parameters that should be set for the HBA driver.
Configuring Brocade FC HBAs for Windows
This section applies to Windows hosts that have Brocade HBAs installed. After the device
driver and firmware are installed, you must configure the HBAs. To perform this task, use the
Brocade host connectivity manager (HCM) software or reboot into the HBA BIOS, load the
adapter defaults, and set the following values:
Host Adapter BIOS: Disabled (unless the host is configured for SAN Boot)
Queue depth: 4
Configuring QLogic FC HBAs for Windows
This section applies to Windows hosts that have QLogic HBAs installed.
After the device driver and firmware are installed, you must configure the HBAs. To complete
this task, use the QLogic SANsurfer software or reboot into the HBA BIOS, load the adapter
defaults, and set the following values:
Host Adapter BIOS: Disabled (unless the host is configured for SAN Boot)
Adapter Hard Loop ID: Disabled
Connection Options: 1 (point-to-point only)
LUNs Per Target: 0
Port Down Retry Count: 15

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Configuring Emulex FC HBAs for Windows
This section applies to Windows hosts that have Emulex HBAs installed.
After the device driver and firmware are installed, you must configure the HBAs. To complete
this task, use the Emulex HBAnyware software or reboot into the HBA BIOS, load the
defaults, and set topology to 1 (10F_Port Fabric).
Setting the Windows timeout value
For Windows hosts, the disk I/O timeout value should be set to 60 seconds as an overall rule
but you must also check recommended guidance for your application. To verify this setting,
complete the following steps:
1.Click Start  Run.
2.In the dialog box, enter regedit and press Enter.
3.In the registry editor, search for the
HKEY_LOCAL_MACHINE\System\CurrentControlSet\services\Disk\TimeOutValue key.
4.Confirm that the value for the key is 60 (decimal value), and, if necessary, change the
value to 60, as shown in Figure 4-1.
Figure 4-1 Windows timeout value
Installing the Microsoft MPIO multipathing software
Microsoft Multipath Input/Output (MPIO) solutions are designed to work with device-specific
modules (DSMs) that are written by vendors. The MPIO driver package does not form a
complete solution on its own. By using this joint solution, the storage vendors can design
device-specific solutions that are tightly integrated with the Microsoft Windows operating
system. MPIO in Microsoft Windows 2008 is a Device Specific Module (DSM) that is designed
to work with Storage Arrays that support the Asymmetric Logical Unit Access (ALUA) control
model, basically active-active Storage Controllers.
The intent of MPIO is to provide better integration of a multipath storage solution with the
operating system. It also allows the use of multipath in the SAN infrastructure during the boot
process for SAN Boot hosts.
To install MPIO on a computer that is running Microsoft Windows Server 2008, complete the
following steps:
1.Open Server Manager by clicking Start  Administrative Tools  Server Manager.
2.In the Features area, click Add Features.
3.Select MPIO from a list of available features and click Next.
4.Confirm the installation Selections and click Install.
5.Close the wizard after the installation process is completed.

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Installing IBM SDDDSM multipathing software
IBM Subsystem Device Driver DSM (SDDDSM) is the IBM multipath I/O solution that is based
on Microsoft MPIO technology. It is a device-specific module that is designed to support IBM
storage devices on Microsoft Windows systems. It is designed to support multipath
configuration environment for most of IBM Storage Arrays.
To ensure correct multipathing with IBM Storwize V3700, SDDDSM must be installed on
Microsoft Windows hosts. To install SDDDSM, complete the following steps:
1.Check the SDDDSM download matrix to determine the correct level of SDDDSM to install
on Windows 2008 (R2) and download the package from this website:
http://ibm.com/support/docview.wss?uid=ssg1S7001350#WindowsSDDDSM
2.Extract the package to your hard disk drive and run setup.exe to install SDDDSM. A
command prompt window opens, as shown in Figure 4-2. Confirm the installation by
entering Y.
Figure 4-2 SDDDSM setup
3.After the setup completes, you are prompted to restart the system. Confirm this restart by
entering yes and pressing Enter, as shown in Figure 4-3.
Figure 4-3 Installing SDDDSM

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You successfully installed IBM SDDDSM. You can check the installed driver version by
selecting Start  All Programs  Subsystem Device Driver DSM Subsystem Device
Driver DSM. When a command prompt opens, run the datapath query version command to
determine the version that is installed (as shown in Example 4-1) for this Microsoft Windows
2008 R2 host.
Example 4-1 Datapath query version
C:\Program Files\IBM\SDDDSM>datapath.exe query version
IBM SDDDSM Version 2.4.3.1-2
Microsoft MPIO Version 6.1.7601.17514
To determine the Worldwide Port Numbers (WWPNs) of the host (this is applicable for Fibre
Channel adapter only), run the datapath query wwpn command (as shown in Example 4-2)
and take note of WWPN for further use.
Example 4-2 Datapath query wwpn
C:\Program Files\IBM\SDDDSM>datapath query wwpn
Adapter Name PortWWN
Scsi Port3: 10008C7CFF20CFCC
Scsi Port4: 10008C7CFF20CFCD
The IBM Multipath Subsystem Device Driver User’s Guide can be found at
ftp://ftp.software.ibm.com/storage/subsystem/UG/1.8--3.0/SDD_1.8--3.0_User_Guide_E
nglish_version.pdf and provides useful information about how to install and configure SDD
on the main Operating System platforms.
If the SAN Zone configuration already is established, the Microsoft Windows host is prepared
to connect to the IBM Storwize V3700. The next step is to configure a host object and its
WWPNs by using the IBM Storwize V3700 GUI. For more information, see 4.3, “Configuring
hosts on IBM Storwize V3700” on page 175.
Microsoft Windows operating systems can use SAN Boot implementations. SAN Boot details
are beyond the intended scope of this book. For more information and supportability about
Microsoft systems booting from storage area networks (SANs), check the Microsoft article at
this website:
http://support.microsoft.com/kb/305547
4.2.2 Windows 2008 R2: Preparing for iSCSI attachment
Microsoft iSCSI Initiator enables you to connect a Microsoft Window system host to an
external iSCSI Storage Array by using Ethernet infrastructure. The use of iSCSI protocol
enables the use of block-based SAN without acquiring other hardware.
Windows 2003: The examples focus on Windows 2008 R2, but the procedure for
Windows 2003 is similar. If you use Windows 2003, you must install Microsoft Hotfix
908980 or latest Service Pack. If you do not install these, preferred pathing is not available.
You can download this hotfix from this website:
http://support.microsoft.com/kb/908980

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In Windows 2008 R2, the Microsoft iSCSI software initiator is preinstalled. Enter iscsi in the
search field of the Windows start menu (as shown in Figure 4-4) and click iSCSI Initiator.
Figure 4-4 Windows iSCSI initiator software
Confirm the automatic startup of the iSCSI Service, as shown in Figure 4-5.
Figure 4-5 Automatic startup of the iSCSI Service
The iSCSI Configuration window opens. Select the Configuration tab, as shown in
Figure 4-6 on page 158. Make a note of the initiator name of your Windows host for further
use.

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Figure 4-6 iSCSI Initiator Properties window
You can change the initiator name or enable advanced authentication, but these tasks are
beyond the scope of our basic setup. By default, iSCSI authentication is not enabled. For
more information, see the IBM Storwize V3700 V7.1 Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp
For more information about Microsoft iSCSI authentication and security, see the following
website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Fsvc_iscsisancoverview_08301435.html&resultof%3D%2522%2569%25
73%2563%2573%2569%2522%2520
Windows 2008 R2 iSCSI Target Configuration
These sections cover the basic setup of iSCSI targets from Microsoft Windows 2008 R2 host.
Complete the following steps from the host perspective:
1.From Microsoft Windows 2008, start the iSCSI Initiator software by clicking Start and
entering iscsi in the field, as shown in Figure 4-7 on page 159.
2.Select the Targets tab to add iSCSI Target IP and click Quick Connect, as shown in
Figure 4-7 on page 159.

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Figure 4-7 iSCSI target IP
3.A Quick Connect window opens in which the name and status of iSCSI Target is
confirmed, as shown in Figure 4-8.
Figure 4-8 iSCSI quick connect window
4.Switch to the Volumes and Devices tab. If the IBM Storwize V3700 was configured for
iSCSI connectivity and volumes were mapped to the host, a list of iSCSI disks should
appear, as shown in Figure 4-9 on page 160.

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Figure 4-9 iSCSI Initiator Properties: Volumes and Devices
5.Click the Auto Configure button to automatically configure all volumes and devices on the
discovered target.
6.To assign the volume to specific drive letter on Microsoft Windows 2008 R2, open the Disk
Management tool. The new volume must be brought online and initialized, as shown in
Figure 4-10.
Figure 4-10 Configuring a new volume

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The initial configuration of iSCSI connectivity features a single path until the Microsoft MPIO
feature is installed. For more information, see “Installing the Microsoft MPIO multipathing
software” on page 154. To configure iSCSI multipathing, see 5.3.2, “Windows 2008 iSCSI
volume attachment” on page 220.
These are the basic steps to configure an iSCSI target on Windows Server 2008 R2. For a
more detailed description about Installing and configuring the iSCSI initiator, see the
Microsoft Technet web link at this website:
http://technet.microsoft.com/en-us/library/ee338480%28v=ws.10%29.aspx
Setting the Windows registry keys
Complete the following steps to change the system registry to make your iSCSI operations
more reliable (you must also check recommended guidance for your application):
1.In the search field of the Windows Start menu, enter regedit and click regedit.exe.
2.In the registry editor, locate the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-B
FC1-08002BE10318}\<bus ID>\Parameters\LinkDownTime
Confirm that the value for the LinkDownTime key is 120 (decimal value), and, if necessary,
change the value to 120.
3.In the registry editor, locate the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-B
FC1-08002BE10318}\<bus ID>\Parameters\MaxRequestHoldTime
Confirm that the value for the MaxRequestHoldTime key is 120 (decimal value), and, if
necessary, change the value to 120.
4.In the registry editor, locate the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-B
FC1-08002BE10318}\<bus ID>\Parameters\ MaxPendingRequests
Confirm that the value for the MaxPendingRequests key is 2048 (decimal value), and, if
necessary, change the value to 2048.
5.In the registry editor, locate the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Disk\TimeOutValue
Confirm that the value for the TimeOutValue key is 60 (decimal value), and, if necessary,
change the value to 60.
6.Reboot your host for these changes to take effect.
These steps are the basic steps to prepare a Windows 2008 R2 host for iSCSI attachment.
For more information about configuring the IBM Storwize V3700 for iSCSI connections, see
4.3.4, “Configuring IBM Storwize V3700 for iSCSI host connectivity.” on page 183.
4.2.3 Windows 2008 R2: Preparing for SAS attachment
SAS is a serial interface for SCSI disks. SAS Host Bus Adapters are plug-in PCI devices at
low cost that support direct attached to Storage Controllers.
Complete the following steps to prepare a Microsoft Windows 2008 R2 host to connect to an
IBM Storwize V3700 by using direct attach SAS connection:
1.Make sure the latest OS Service Pack, updates and hotfixes are applied to your Microsoft
Windows server.

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2.Use the latest firmware and drive on your host system.
3.Install SAS Host Bus Adapter.
4.Connect the SAS cables to the host HBA and IBM Storwize V3700 Canister (or canisters)
SAS host port (or ports).
5.Configure HBA firmware and drivers on Microsoft Windows host (unless SAN boot).
6.Install multipath Driver Device Module software.
Downloading and installing the supported drivers and firmware
Install a supported HBA driver for your configuration. Use the Windows Device Manager or
vendor tools. An LSI Card was used in this example and there is no further configuration
required to connect the SAS cables to IBM Storwize V3700.
Always check the vendor’s readme file to see whether there are Windows registry parameters
or Operating System configurations that should be set for the HBA driver.
Recording SAS WWPN
Complete the following steps to record SAS WWPN for further use. In this example, we use
LSI PCI SAS 6 Gb Host Bus Adapter model:
1.Restart your host system.
2.While system BIOS is starting, press Ctrl+C to start the LSI Configuration Utility when the
LSI banner appears in the window.
3.The LSI Configuration Utility is started, as shown in Figure 4-11. Select the required SAS
Card from the list of devices and press Enter. In the example, the SAS adapter is attached
to PCI I/O module on Bus 02.
Figure 4-11 LSI Configuration Utility

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4.Record the SAS WWPN information from SAS Address line, as shown in Figure 4-12.
Figure 4-12 Recording SAS address
5.Press ESC to exit.
Configuring SAS HBAs parameters
This section applies to host systems that use SAS host bus adapters. After the adapter is
installed, some parameters can be changed depending on what application is using the
storage array disk. The following settings are recommended:
I/O Timeout for Block Devices: 10
I/O Timeout for Sequential Devices: 10
I/O Timeout for Other Devices: 10
LUNs to Scan for Block Devices: All
LUNs to Scan for Sequential Devices: All
LUNs to Scan for Other Devices: All
Configuring Windows with SAS SAN Boot
If you intend to use SAN boot with your SAS direct attach PCI card, you must configure your
system BIOS to boot from your PCI device. Generally, you must start it from the BIOS
settings, as described in “Recording SAS WWPN” on page 162, under SAS Topology.
Boot your computer from a Windows CD or ISO image and press F6 when you see the
message Setup is inspecting your computer’s hardware configuration. Follow the
instructions until you are prompted to insert the hardware support disk that contains your SAS
drivers.
Installing the multipathing software
When u SAS host bus adapters are used, a multipath I/O software solution is still required to
provide a software layer to manage more than one physical path between the host system
and the IBM Storwize V3700. IBM SDDDSM provides the fault-tolerance and performance
techniques that are required when a SAS path fails, which enables the operating system to
route the IO traffic to the most available path that is not apparent to the application.

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For more information about verifying the installation of SDDDSM, see “Installing the Microsoft
MPIO multipathing software” on page 154.
4.2.4 VMware ESX: Preparing for Fibre Channel attachment
Complete the following steps to prepare a VMware ESXi host to connect to an IBM Storwize
V3700 that uses Fibre Channel:
1.Install HBA or HBAs on the ESXi server.
2.Make sure that the latest firmware levels are applied on your host system.
3.Update and configure the HBA for hosts that are running ESXi.
4.Connect the FC Host Adapter ports to the switches.
5.Configure the switches (SAN Zoning).
6.Install VMware ESXi and load more drivers, if required.
Downloading and installing the supported firmware
Download and install the latest firmware level (or levels) to your host server. Follow the steps
provided by VMware to install the HBAs driver (or divers) and firmware (or firmwares). Also,
check the IBM Storwize V3700 Supported Hardware List, Device Driver, Firmware, and
Recommended Software Levels V7.1 list for VMware, which is available at this website:
http://www.ibm.com/support/docview.wss?rs=591&uid=ssg1S1004380
Some HBAs, especially the new CNA Adapters, require another driver to be loaded into ESX.
To see whether there are any requirements for your configuration, check the VMware
Compatibility Guide that is available at this website:
http://www.vmware.com/resources/compatibility/search.php
Configuring Brocade HBAs for VMware ESX
This section applies to ESXi hosts that have Brocade HBAs installed. After the firmware is
installed, load the default settings for all your adapters that are installed on the host system
and make sure that the Adapter BIOS is disabled, unless SAN Boot is used.
Configuring QLogic HBAs for VMware ESX
This section applies to ESXi hosts that have QLogic HBAs installed. After the firmware is
installed, you must configure the HBAs. To perform this task, use the QLogic SANsurfer
software or the HBA BIOS, load the adapter defaults, and set the following values:
Recommended Host Adapter Settings:
– Host Adapter BIOS: Disabled (unless the host is configured for SAN Boot)
– Frame size: 2048
– Loop Reset Delay: 5 (minimum)
– Adapter Hard Loop ID: Disabled
– Hard Loop ID: 0
– Spinup Delay: Disabled
– Connection Options 1: Point-to-point only
– Fibre Channel Tape Support: Disabled
– Data Rate: 2
Recommended Advanced Adapter Settings:
– Execution throttle: 100
– LUNs per Target: 0
– Enable LIP Reset: No
– Enable LIP Full Login: Yes
– Enable Target Reset: Yes

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– Login Retry Count: 8
– Link Down Timeout: 10
– Command Timeout: 20
– Extended event logging: Disabled (enable it for debugging only)
– RIO Operation Mode: 0
– Interrupt Delay Timer: 0
Configuring Emulex HBAs for VMware ESXi
This section applies to ESXi hosts that have Emulex HBAs installed. After the firmware is
installed, load the default settings for all your adapters that are installed on the host system
and make sure that the Adapter BIOS is disabled, unless SAN Boot is used.
VMware ESXi installation
Install your VMware ESXi server and load any other drivers and patches, if required. For more
information about this procedure, see the installation guide that is available at this website:
http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter
-server-50-storage-guide.pdf
After you complete your ESXi installation, connect to your ESXi Server by using the vSphere
client and browse to the Configuration tab. Click Storage Adapters and scroll down to your
FC HBAs, as shown in Figure 4-13. Make a note of the WWPNS of the installed adapters for
further use.
Figure 4-13 Show WWPNs in VMware ESX

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VMware ESXi multipathing
The ESXi server has its own multipathing software. You do not need to install a multipathing
driver on the ESXi server or on the guest operating systems. The ESXi multipathing policy
supports the following operating modes:
Round Robin
Fixed
Most Recently Used (MRU)
The IBM Storwize V3700 is an active/active storage device. Since VMware ESXi 5.0 and later,
the suggested multipathing policy is Round Robin. Round Robin performs dynamic load
balancing for I/O. If you do not want to have the I/O balanced over all available paths, the
Fixed policy is supported. This policy setting can be selected for every volume. Set this policy
after IBM Storwize V3700 LUNs are attached to the ESXi host. For more information about
attaching IBM Storwize V3700 LUNs to ESX, see Chapter 5., “Basic volume configuration” on
page 189.
After all of these steps are completed, the ESXi host is prepared to connect to the IBM
Storwize V3700. To create the ESX Fibre Channel host in the IBM Storwize V3700 GUI, see
4.3.2, “Creating Fibre Channel hosts” on page 177.
4.2.5 VMware ESX: Preparing for iSCSI attachment
This section describes how to enable iSCSI on VMware ESX hosts. In this book, we focus on
vSphere ESXi 5.1. This release of ESX also supports useful features, such as jumbo frames
and an increased numbers of switches supported per server and doubles the number of port
groups that are supported per server. We focus on the basic ESXi iSCSI setup. For more
information, see vSphere Storage, which is available at the following website:
http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter
-server-50-storage-guide.pdf
To check for more recent editions of this document, see this website:
http://www.vmware.com/support/pubs
Complete the following steps to prepare a VMware ESXi host to connect to an IBM Storwize
V3700 using iSCSI:
1.Make sure that the latest firmware levels are applied on your host system.
2.Install VMware ESXi and load more drivers, if required.
3.Connect the ESXi server to your network. You should use separate network interfaces for
iSCSI traffic.
4.Configure your network to fulfill your security and performance requirements.
The iSCSI initiator is installed by default on ESXi server, and only must be enabled. To enable
the initiator, complete the following steps:
1.Connect to your ESXi server by using the vSphere Client. Browse to the Configuration tab
and select Networking, as shown in Figure 4-14 on page 167.

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Figure 4-14 Select VMware networking
2.Click Add Networking to start the Add Network Wizard, as shown in Figure 4-15. Select
VMkernel and click Next.
Figure 4-15 Add Network Wizard

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3.Select one or more network interfaces that you want to use for iSCSI traffic and click Next,
as shown in Figure 4-16.
Figure 4-16 Select an iSCSI interface
VMKernel: The VMkernel networking interface is used for VMware vMotion, IP storage
and Fault Tolerance.

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4.Enter a meaningful Network Label and click Next, as shown in Figure 4-17.
Figure 4-17 Enter network label
Important: None of the properties were marked intentionally; see VMware Best
Practices and Recommendation for use of these options.

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5.Enter an IP address for your iSCSI network. You should use a dedicated network for iSCSI
traffic, as shown in Figure 4-18.
Figure 4-18 iSCSI IP settings
6.Click Next to see what is included in the network settings and the click Finish to exit from
iSCSI configuration.

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7.From the Configuration tab, select Storage Adapters and scroll down to iSCSI Adapter
and click Properties, as shown in Figure 4-19.
Figure 4-19 iSCSI software adapter

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8.The iSCSI Software Adapter Properties window opens. Click Configure and the General
Properties window opens. The initiator is enabled by default (it was changed from VMware
ESX 4.0). Parameters can be changed here if required.The VMware ESX iSCSI initiator is
now successfully enabled, as shown in Figure 4-20. Make a note of the initiator name for
future use.
Figure 4-20 iSCSI initiator properties
VMware iSCSI Target Configuration
This section describes the basic setup of VMware iSCSI Targets. Complete the following
steps to configure the VMware iSCSI target:
1.By using VMware vSphere client, connect to your ESX host. From the Configuration tab,
click Storage Adapters. Select the iSCSI adapter interface from VMware vSphere client
and select Properties.
2.The iSCSI Initiator Properties window opens. Select the Static Discovery tab, as shown
in Figure 4-21 on page 173.

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Figure 4-21 iSCSI Static Target Discovery
3.Click Add to enter the IBM Storwize V3700 iSCSI IP address (or addresses) or iSCSI
target name (or names). Typically, the default iSCSI target port is TPC Port 3260. In this
example, the default Port remains and the IBM Storwize V3700 iSCSI IP address (or
addresses) are added, as shown in Figure 4-22.
Figure 4-22 Add Static Target Server
4.Click Ok to confirm. Repeat step 3 to add other IBM Storwize V3700 node canister iSCSI
IP addresses.

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5.After all entries are completed, click Ok and then click Close. A new window should
appear to explain that a rescan of iSCSI adapter is necessary, as shown in Figure 4-23.
Figure 4-23 Rescan of iSCSI adapter
Your VMware ESX host is now prepared to connect to the IBM Storwize V3700. For more
information about creating the ESX iSCSI host by using the IBM Storwize V3700 GUI, see
4.3, “Configuring hosts on IBM Storwize V3700” on page 175.
For more information and best practices procedures that use VMware vSphere 5.1, see the
guide that is available at this website:
http://pubs.vmware.com/vsphere-51/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter
-server-51-storage-guide.pdf
4.2.6 VMware ESX: Preparing for SAS attachment
This section describes how to connect a VMware ESX host to an IBM Storwize V3700 using a
SAS Host Bus Adapter. In this book, we focus on ESXi 5.1 and LSI SAS HBA model 9207-8e.
Complete the following steps to connect your ESX system with a SAS HBA device to an IBM
Storwize V3700:
1.Install the HBA(s) on ESX system.
2.Ensure latest firmware level (or levels) is applied on your ESX system.
3.Update and configure the SAS host bus adapter, if required.
4.Connect SAS cables securely at both ends, the host SAS HBA and the IBM Storwize
V3700 SAS host ports.
For more information about VMware vSphere Storage, including how to configure, use, and
manage different types of Storage, see this website:
http://pubs.vmware.com/vsphere-51/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter
-server-51-storage-guide.pdf
In our example, no changes were required to any of the HBA parameters. A single two-port
SAS card was used to connect to both node canisters in the I/O group.

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By using VMware vSphere client, the SAS HBA is visible by selecting Configuration 
Storage Adapters, as shown in Figure 4-24.
Figure 4-24 Storage adapters
4.3 Configuring hosts on IBM Storwize V3700
This section describes how to create Fibre Channel, iSCSI, and SAS hosts by using the IBM
Storwize V3700 GUI. We assume that the hosts were prepared as described in Chapter 4.2,
“Preparing the host operating system” on page 153, and WWPNs, iSCSI, or SAS addresses
were recorded for host creation purposes.
4.3.1 Considerations when creating hosts on IBM Storwize V3700
When a host object is created on an IBM Storwize V3700, remember to verify the
configuration limits and restrictions. The maximum number of host objects per I/O Group is
512 whether they are Fibre Channel, SAS, or iSCSI hosts. For more information about IBM
Storwize V3700 Limits and Restrictions, see this website:
http://www.ibm.com/support/docview.wss?rs=591&uid=ssg1S1004380
Important: Under the WWN column in VMware vSphere client, worldwide port names
(WWPNs) are not shown. To obtain the WWN number, see “Recording SAS WWPN” on
page 162.

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IBM Storwize V3700 supports a maximum of two nodes per system, which are arranged as
single I/O Group per cluster. To create a host, complete the following steps:
1.From the IBM Storwize V3700 GUI, open the host configuration window by clicking Hosts,
as shown in Figure 4-25.
Figure 4-25 Open host window
2.In the Hosts window, click New Host to start the Create Host wizard, as shown in
Figure 4-26.
Figure 4-26 Create a host
The IBM Storwize V3700 V7.1 supports Fibre Channel, iSCSI, and SAS Hosts. If you want to
create a Fibre Channel host object, continue with 4.3.2, “Creating Fibre Channel hosts”.
For more information about creating iSCSI hosts, see 4.3.3, “Creating iSCSI hosts” on
page 181.
For more information about creating SAS hosts, see 4.3.5, “Creating SAS hosts” on
page 186.

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4.3.2 Creating Fibre Channel hosts
To create Fibre Channel hosts, complete the following steps:
1.Click Fibre Channel Host, as shown in Figure 4-26 on page 176. The Fibre Channel
configuration wizard opens, as shown in Figure 4-27.
Figure 4-27 Create Fibre Channel Host
2.Enter a host name and click the Fibre Channel Ports drop-down menu to see a list of all
known WWPNs, as shown in Figure 4-28.
Figure 4-28 Available WWPNs
The IBM Storwize V3700 shows the host port WWPNs available if you prepared the hosts,
as described in 4.2, “Preparing the host operating system” on page 153. If they do not
appear in the list, scan for new disks in your operating system and click Rescan in the
configuration wizard. If they still do not appear, check your SAN zoning and repeat the
scanning.
l
AIX hosts: AIX host WWPNs appear after few minutes after you log in to the fabric. You
can enter the WWPN manually or run the cfgmgr command on the AIX host again. This
starts a new discovery process and updates the SAN Fabric. WWPNs should then be
available to the IBM Storwize V3700 GUI.

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3.Select the WWPN for your host and click Add Port to List, as shown in Figure 4-29.
Figure 4-29 Add a port to a list
4.Add all host ports, as shown in Figure 4-30.
Figure 4-30 Add all WWPNs
Creating offline hosts: If you want to create offline hosts object in IBM Storwize V3700
(for example, if it is not connected at the moment), it is also possible to enter the
WWPNs manually. Enter them in standardized format into the Fibre Channel Ports field
and add them to the list.

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5.Click Advanced. If you are creating an HP/UX or TPGS host, select the required Host
Type from the list, as shown in Figure 4-31.
Figure 4-31 Advanced Settings
6.Click Create Host. The created host task runs, as shown in Figure 4-32.
Figure 4-32 Create Host completes

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7.Click Close to return to the host window, as shown in Figure 4-33.
Figure 4-33 All Hosts
8.Repeat steps 1 - 7 for all of your Fibre Channel hosts. Figure 4-34 shows the All Hosts
window after a second host is created.
Figure 4-34 All Hosts after a second host is created
After you complete the creation of Fibre Channel hosts, see Chapter 5, “Basic volume
configuration” on page 189 to create volumes and map them to the created hosts.

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4.3.3 Creating iSCSI hosts
To create iSCSI hosts, complete the following steps:
1.Click iSCSI Host (as shown in Figure 4-26 on page 176) and the iSCSI configuration
wizard opens, as shown in Figure 4-35.
Figure 4-35 Create an iSCSI host
2.Enter a host name and the iSCSI initiator name into the iSCSI Ports field and click Add
Ports to List, as shown in Figure 4-36. Repeat this step if several initiator names are
required for one host.
Figure 4-36 Enter name and iSCSI ports

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3.If you are connecting an HP/UX or TPGS host, select Advanced (as shown in
Figure 4-37) and select the correct host type.
Figure 4-37 Advanced Settings options
4.Click Create Host and the wizard completes, as shown in Figure 4-38. Click Close.
Figure 4-38 Create an iSCSI host complete
5.Repeat steps 1 - 4 for every iSCSI host that you want to create.

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4.3.4 Configuring IBM Storwize V3700 for iSCSI host connectivity.
The iSCSI hosts are now configured on the IBM Storwize V3700. To provide connectivity, the
iSCSI Ethernet ports must also be configured. Complete the following steps to enable iSCSI
connectivity:
1.Switch to the Settings window and click Network, as shown in Figure 4-39.
Figure 4-39 Settings  Network

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2.Select iSCSI and the iSCSI configuration window opens, as shown in Figure 4-40.
Figure 4-40 iSCSI Configuration
In the iSCSI Configuration, you have all the iSCSI settings for the IBM Storwize V3700.
You can configure iSCSI Alias, iSNS Addresses, Chap Authentication Configuration, and
iSCSI IP addresses from this window.
Important: The name of the system becomes part of iSCSI qualified name (IQN). If you
change the cluster name after iSCSI is configured, iSCSI hosts might need to be
reconfigured.

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3.Click in the Node Canister drop-down menu to select the canister you want to enter the
iSCSI IP addresses, as shown in Figure 4-41. Repeat this step for each Ethernet port from
both node canisters.
Figure 4-41 Enter iSCSI IP addresses
4.After you enter the IP addresses for each port, click Save to enable the configuration, as
shown in Figure 4-42.
Figure 4-42 iSCSI IP Configuration
If you need to setup iSNS and CHAP authentication, scroll down to enter the IP address for
the iSCSI Storage Name Service (iSNS). After you configure the CHAP secret for the
Storwize V3700 clustered system, ensure that the clustered system CHAP secret is added to
each iSCSI-attached host.
Before your ESXi host can discover the IBM Storwize V3700 storage, the iSCSI initiator must
be configured and authentication might need to be done, depending on the customer
scenario.

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You can verify the network configuration by using the vmkping utility. If you must authenticate
the target, you might need to configure the dynamic or static discovery address and target
name of the Storwize V3700 in vSphere. For more information, see “VMware iSCSI Target
Configuration” on page 172.
For more information about creating volumes and mapping them to a host, see Chapter 5,
“Basic volume configuration” on page 189.
4.3.5 Creating SAS hosts
The next steps provide guidance on how to setup hosts with SAS Host Bus Adapter (or
adapters). Complete the following steps by using the IBM Storwize V3700 GUI to create an
SAS host:
1.Click SAS Host. The Create Host window opens, as shown in Figure 4-43.
Figure 4-43 Create SAS host
2.Enter the Host name and from the drop-down menu, select the SAS WWPN (or WWPNs)
that is associated with the host, as shown in Figure 4-44.
Figure 4-44 Available SAS WWPN
3.Click Advanced to expand the Advanced Settings options.
4.As shown Figure 4-45 on page 187, select HP/UX or TPGS if you are creating one of
these types of hosts.
For more information, see Chapter 5.2.2, “Manually mapping a volume to the host” on
page 210.

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Figure 4-45 Creating HP/UX SAS host
5.Click Create Host to create SAS Host object on IBM Storwize V3700.
6.Click Close upon task completion.
The IBM Storwize V3700 shows the host port WWPNs that are available if you prepared the
hosts, as described in 4.2, “Preparing the host operating system” on page 153. If they do not
appear in the list, scan for new disks in your operating system and click Rescan in the
configuration wizard. If they still do not appear, check your physical connectivity, paying
particular attention to the SAS cable orientation and repeat the scanning. For more
information about hosts, see the Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/topic/com.ibm.storwize.v3700.7
10.doc/svc_over_1dcur0.html
The IBM Storwize V3700 is now configured and ready for SAS Host use. For more
information about advanced host and volume administration, see Chapter 8, “Advanced host
and volume administration” on page 353.

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© Copyright IBM Corp. 2013. All rights reserved.
189
Chapter 5.
Basic volume configuration
This chapter describes how to use the IBM Storwize V3700 to create a volume and map a
volume to a host. A volume is a logical disk on the IBM Storwize V3700 that is provisioned out
of a storage pool and is recognized by a host with an identifier UID field and a parameter list.
The first part of the chapter describes how to create volumes of different types and map them
to the defined host.
The second part of this chapter describes how to discover those volumes. After you finish this
chapter, your basic configuration is done and you can store data on the IBM Storwize V3700.
Advanced host and volume administration, such as adding and deleting host ports and
creating thin provisioned volumes, is described in Chapter 8, “Advanced host and volume
administration” on page 353.
This chapter includes the following topics:
Provisioning storage from IBM Storwize V3700 and making it available to the host
Mapping a volume to the host
Discovering the volumes from the host and specifying multipath settings
5

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5.1 Provisioning storage from IBM Storwize V3700 and making
it available to the host
This section describes the setup process and shows how to create volumes and make them
accessible from the host. The following steps are required to complete the basic setup of your
environment:
1.Create volumes.
2.Map volumes to the host.
3.Discover the volumes from the host and specify multipath settings.
Complete the following steps to create the volumes:
1.Open the All Volumes window of the IBM Storwize V3700 GUI to start the process of
creating volumes, as shown in Figure 5-1.
Figure 5-1 GUI Volumes option

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Highlight and click Volumes and the window that lists all current volumes opens, as shown in
Figure 5-2 on page 191.
Figure 5-2 Volume listings
If this is a first time setup, no volumes are listed. Click New Volume in the upper left of the
window.
2.The New Volume window opens, as shown in Figure 5-3.
Figure 5-3 New Volumes
By default, all volumes that you create are striped across all available MDisks in that
storage pool. The GUI for the IBM Storwize V3700 provides the following preset selections
for the user:

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– Generic: A striped volume that is fully provisioned, as described in 5.1.1, “Creating a
generic volume” on page 192. By fully provisioned, we mean that the volume capacity
reflects the same size physical disk capacity.
– Thin-provisioned: A striped volume that is space efficient. This means that the volume
capacity is not reflected the physical capacity that is available to the volume. There are
choices available in the Advanced menu to help determine how much space is fully
allocated initially and how large the volume can grow, as described in 5.1.2, “Creating a
thin-provisioned volume” on page 195.
– Mirror: A striped volume that consists of two striped copies and is synchronized to
protect against loss of data if the underlying storage pool of one copy is lost, as
described in 5.1.3, “Creating a mirrored volume” on page 198.
– Thin-mirror: Two synchronized copies. Both are thin provisioned, as described in 5.1.4,
“Creating a thin-mirror volume” on page 203.
3.Select which volume you want to create. For more information, see the relevant section in
this chapter.
5.1.1 Creating a generic volume
The most commonly used type of volume is the generic volume. This type of volume is fully
provisioned, which means that the volume size reflects the physical disk capacity that is
allocated to the volume. The host and the IBM Storwize V3700 see the fully allocated space.
Complete the following steps to create a generic volume:
1.Choose a generic volume, as shown in Figure 5-4.
Figure 5-4 Provisioning a Generic volume

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2.Select the pool in which the volume is to be created. Select the pool by clicking it. In our
example, we click the mdiskgrp0 pool, as shown in Figure 5-5.
Figure 5-5 Pool Selection
Important: The “Create and Map to Host” option is disabled if no host is configured on
the IBM Storwize V3700. For more information about configuring the host, see
Chapter 4, “Host configuration” on page 151.

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There are advanced options available, as shown in Figure 5-6.
Figure 5-6 Generic Advanced options
For Generic volumes, capacity management and mirroring do not apply. There is an option
to set the preferred node within the I/O Group. The recommendation is to set Preferred
Node to automatic and allow the IBM Storwize V3700 balance the volume I/O across the
two node canisters in the I/O Group.

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3.Enter a volume name and size. Click Create and Map to Host to create and map the new
volume to a host or click Create to complete the task and leave mapping the volume to a
later stage. The Generic Volume is created, as shown in Figure 5-7.
Figure 5-7 Volume creation complete
If you chose to map the host, click Continue and see 5.2.1, “Mapping newly created volumes
to the host by using the wizard” on page 207.
If you do not want to map the volumes now, click Close and they can be mapped later, as
described in 5.2.2, “Manually mapping a volume to the host” on page 210.
5.1.2 Creating a thin-provisioned volume
Volumes can be configured to be thin-provisioned. A thin-provisioned volume behaves the
same as a fully provisioned volume regarding application reads and writes. However, when a
thin-provisioned volume is created, it is possible to specify two capacities: the real physical
capacity that is allocated to the volume from the storage pool, and its virtual capacity that is
available to the host.
The real capacity determines the quantity of extents that are initially allocated to the volume.
The virtual capacity is the capacity of the volume that is reported to all other components (for
example, FlashCopy and cache) and to the host servers.

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To create a thin-provisioned volume, complete the following steps:
1.Select Thin-Provision, as shown in Figure 5-8.
Figure 5-8 Create a thin-provisioned volume
2.Select the pool in which the thin-provisioned volume should be created by clicking it and
entering the volume name and size. In our example, we click the mdiskgrp0 pool. The
result is shown in Figure 5-9.
Figure 5-9 Enter the volume name and size

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Under the Volume Name field is a summary that shows that you are about to make a
thin-provisioned volume, what virtual capacity is to be configured (this is the volume size
you specified), the space that is physically allocated (real capacity), and the available
physical capacity in the pool. By default, the real capacity is 2% of the virtual capacity but
you can change this setting in the Advanced options. Select Advanced and click Capacity
Management, as shown in Figure 5-10.
Figure 5-10 Advanced Settings
The following advanced options are available:
– Real: Specify the size of the physical capacity space that is used during creation.
– Automatically Extend: This option enables the automatic expansion of real capacity as
the physical data size of the volume grows.
– Warning Threshold: Enter a threshold for receiving capacity alerts; the IBM Storwize
V3700 will send an alert when the physically allocated capacity reaches 80% of the
virtual capacity in this case. This is the default setting.
– Thin-Provisioned Grain Size: Specify the grain size for real capacity.
3.Make your choices, if required, and click OK to return to New Volume window, as shown in
Figure 5-9 on page 196.

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4.Click Create and Map to Host to create and map the volume to a host, or click Create to
complete the task and leave mapping the volume to a later stage. The volume is created,
as shown in Figure 5-11.
Figure 5-11 Thin volume creation complete
If you chose to map the host, click Continue and see 5.2.1, “Mapping newly created volumes
to the host by using the wizard” on page 207
If you do not want to map the volumes now, click Close and they can be mapped later, as
described in 5.2.2, “Manually mapping a volume to the host” on page 210.
5.1.3 Creating a mirrored volume
IBM Storwize V3700 offers the capability to mirror volumes, which means a single volume is
presented to the host, but two copies exist in the storage back end, usually in different storage
pools (all reads are handled by the primary copy). This feature is similar to host-based
software mirroring, but it provides a single point of management for all operating systems and
provides storage high availability to operating systems that do not support software mirroring.
By using this setup with the mirror copies in different storage pools, you can protect against
array failures (for example multiple disk failures) and more advanced features are available to
you, as described in Chapter 8, “Advanced host and volume administration” on page 353.
The mirroring feature improves availability, but it is not a disaster recovery solution because
both copies are accessed by the same node pair and are addressable only by a single cluster.
For more information about a disaster recovery solution with mirrored copies spanning I/O
Groups in different locations, see the Chapter 10, “Copy services” on page 449.

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To create a mirrored volume, complete the following steps:
1.Select Mirror, as shown in Figure 5-12.
Figure 5-12 Create a mirrored volume

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2.Select the primary pool by clicking it and the view changes to the secondary pool, as
shown in Figure 5-13.
Figure 5-13 Selecting primary storage pool

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3.Select the secondary pool by clicking it, and enter a volume name and the required size,
as shown in Figure 5-14.
Figure 5-14 Select a secondary pool, volume name, and size
4.The summary shows you the capacity information about the pool. If you want to select
advanced settings, click Advanced and then click the Mirroring tab, as shown in
Figure 5-15 on page 202.
Storage pools: It is best practice before a mirrored volume is created to create at least
two separate storage pools and use different pools for the primary and secondary pool
when entering the information in the GUI to create the volume. In this way, the two
mirror copies are created on different MDisks (and therefore different physical drives)
and protect against a full MDisk failure in a storage pool. For more information about
storage pools, see Chapter 7, “Storage pools” on page 313.

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Figure 5-15 Advanced mirroring features
5.In the advanced mirroring settings, you can specify a synchronization rate. Enter a Mirror
Sync Rate 1 - 100%. With this option, you can set the importance of the copy
synchronization progress. This sets the preference to synchronize more important
volumes faster than other mirrored volumes. By default, the rate is set to 50% for all
volumes. If for any reason the mirrors loose synchronization, this parameter governs the
rate at which the various mirrored volumes re-synchronize. Click OK to return to the New
Volume window, as shown in Figure 5-14 on page 201.

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6.Click Create and Map to Host and the mirrored volume is created, as shown in
Figure 5-16. If you do not want to map hosts, click Create.
Figure 5-16 Mirrored volume task complete
If you chose to map the host, click Continue and see 5.2.1, “Mapping newly created volumes
to the host by using the wizard” on page 207
If you do not want to map the volumes now, click Close and they can be mapped later, as
described in 5.2.2, “Manually mapping a volume to the host” on page 210.
5.1.4 Creating a thin-mirror volume
By using a thin-mirror volume, you can allocate the required physical space on demand (as
described in 5.1.2, “Creating a thin-provisioned volume” on page 195) and have several
copies of a volume available (as described in 5.1.3, “Creating a mirrored volume” on
page 198).

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To create a thin-mirror volume, complete the following steps:
1.Select Thin Mirror, as shown in Figure 5-17.
Figure 5-17 Create a Thin Mirror

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2.Select the primary pool by clicking it and the view changes to the secondary pool, as
shown in Figure 5-18.
Figure 5-18 Selecting storage pools

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3.Select the pool for the secondary copy and enter a name and a size for the new volume,
as shown in Figure 5-19.
Figure 5-19 Enter a volume name and size
4.The summary shows you the capacity information and the allocated space. You can click
Advanced and customize the thin-provision settings (as shown in Figure 5-10 on
page 197) or the mirror synchronization rate (as shown in Figure 5-15 on page 202). If you
opened the advanced settings, click OK to return to the New Volume window, as shown in
Figure 5-19.

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5.Click Create and Map to Host and the mirrored volume is created, as shown in
Figure 5-20.If you do not want to map hosts, click Create to complete the task.
Figure 5-20 Thin Mirror Volume task complete
If you chose to map the host, click Continue and see 5.2.1, “Mapping newly created volumes
to the host by using the wizard” on page 207
If you do not want to map the volumes now click Close and they can be mapped later, as
described in 5.2.2, “Manually mapping a volume to the host” on page 210
5.2 Mapping a volume to the host
The first part of this section describes how to map a volume to a host if you click the Create
and Map to Host option. The second part of this section describes the manual host mapping
process that is used to create customized mappings.
5.2.1 Mapping newly created volumes to the host by using the wizard
We continue to map the volume that we created in 5.1, “Provisioning storage from IBM
Storwize V3700 and making it available to the host” on page 190. We assume that you
followed the procedure and clicked Create and Map to Host followed by Continue when the
volume create task completed.

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To map the volumes, complete the following steps:
1.Select the host as shown in Figure 5-21.
Figure 5-21 Choose a host
2.The Modify Host Mappings window opens and your host and the created volume already
are selected. Click Map Volumes and the volume is mapped to the host, as shown in
Figure 5-22.
Figure 5-22 Modify host mappings

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The new volume to be mapped is highlighted already. To continue and complete the mapping,
you can click Apply or Map Volumes. The only difference is that after the mapping task
completes (as shown in Figure 5-23), the Modify Host Mappings window closes automatically.
Clicking Apply also completes the task, but leaves the Modifying Host Mappings window
open.
Figure 5-23 Host mapping task complete
3.After the task completes, click Close. If you selected the Map Volumes option, the window
returns to the Volumes display and the newly created volume is displayed. We see that it is
already mapped to a host, as shown in Figure 5-24.
Figure 5-24 New Volume that is mapped to host
The host can access the volume and store data on it. For more information about discovering
the volumes on the host and changing host settings if required, see 5.3, “Discovering the
volumes from the host and specifying multipath settings” on page 213.

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You also can create multiple volumes in preparation for discovering them later. Mappings can
be customized as well. For more information about advanced host configuration, see
Chapter 8, “Advanced host and volume administration” on page 353.
5.2.2 Manually mapping a volume to the host
We assume that you followed the procedure that is described in 5.1, “Provisioning storage
from IBM Storwize V3700 and making it available to the host” on page 190 and clicked
Create, as shown in Figure 5-25.
To manually map a volume to the host, complete the following steps:
1.Open the Hosts window, as shown in Figure 5-25.
Figure 5-25 Hosts menu option
2.Right-click the host to which a volume is to be mapped and select Modify Mappings, as
shown in Figure 5-26.
Figure 5-26 Modify mappings selection

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3.The Modify Host Mappings window opens. Select the volume that you want to map from
the Unmapped Volumes pane, as shown in Figure 5-27.
Figure 5-27 Modify host mappings window
The volume is highlighted and the green “move to the right” arrow becomes active, as
shown in Figure 5-28
Figure 5-28 Volume mapping selected

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4.Click the right-pointing arrow button. The volume is moved to Volumes Mapped to the Host
pane, as shown in Figure 5-29. Repeat this step for all the volumes that you want to map.
To continue and complete the mapping, you can click Apply or Map Volumes. The only
difference is that after the mapping task completes as shown in Figure 5-29, the Modify
Host Mappings window closes automatically. Clicking Apply also completes the task but
leaves the Modifying Host Mappings window open.
Figure 5-29 Modify host mappings window
5.After the task completes, click Close, as shown in Figure 5-30 on page 213. If you
selected the Map Volumes option, the window returns to the Hosts display. If you clicked
Apply, the GUI still displays the Modify Host Mappings window.
Important: The Unmapped pane shows all the volumes that are not mapped to the
current selected host. Some of the volumes might display a mappings icon because
they might be mapped to other hosts.

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Figure 5-30 Modify mapping complete
The volumes are now mapped and the host can access the volumes and store data on them.
For more information about discovering the volumes on the host and changing host settings
(if required), see 5.3, “Discovering the volumes from the host and specifying multipath
settings”.
5.3 Discovering the volumes from the host and specifying
multipath settings
This section describes how to discover the volumes that were created and mapped as
described in 5.1, “Provisioning storage from IBM Storwize V3700 and making it available to
the host” on page 190 and 5.2, “Mapping a volume to the host” on page 207, and set more
multipath settings, if required.
We assume that you completed all of the following steps that are described previously in the
book so that the hosts and the IBM Storwize V3700 are prepared:
Prepare your operating systems for attachment including installing MPIO support (see
Chapter 4, “Host configuration” on page 151).
Create hosts by using the GUI (see Chapter 4, “Host configuration” on page 151).
Perform basic volume configuration and host mapping (see 5.1, “Provisioning storage from
IBM Storwize V3700 and making it available to the host” on page 190 and 5.2, “Mapping a
volume to the host” on page 207).
This section describes how to discover Fibre Channel, iSCSI and SAS volumes from
Windows 2008 and VMware ESX 5.x hosts.

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In the IBM Storwize V3700 GUI, click Hosts, as shown in Figure 5-31.
Figure 5-31 Open all hosts
The view that opens gives you an overview of the currently configured hosts and shows if they
are mapped, as shown in Figure 5-32.
Figure 5-32 All Hosts view

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5.3.1 Windows 2008 Fibre Channel volume attachment
To attach the Fibre Channel volume in Windows 2008, complete the following steps:
1.Right-click your Windows 2008 Fibre Channel host in the Hosts view, as shown in
Figure 5-33 and select Properties.
Figure 5-33 Host properties
2.Browse to the Mapped Volumes tab, as shown in Figure 5-34.
Figure 5-34 Mapped volumes to a host
The host details show you which volumes are mapped to the host. You also see the
volume UID and the SCSI ID. In our example, one volume with SCSI ID 0 is mapped to the
host.
3.If MPIO is not already installed on your Windows 2008 host and does not yet have IBM
Subsystem Device Driver installed, follow the procedure that is described in 4.2.1,
“Windows 2008 R2: Preparing for Fibre Channel attachment” on page 153.

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4.Log on to your Microsoft host and click Start  All Programs  Subsystem Device
Driver DSM Subsystem Device Driver DSM. A command-line interface (CLI) opens.
Enter datapath query device and press Enter to see whether there are IBM Storwize
V3700 disks that are connected to this host, as shown in Example 5-1.
Example 5-1 Datapath query device
C:\Program Files\IBM\SDDDSM>datapath query device
Total Devices : 3
DEV#: 0 DEVICE NAME: Disk1 Part0 TYPE: 2145 POLICY: OPTIMIZED
SERIAL: 600507630080009B000000000000003F
============================================================================
Path# Adapter/Hard Disk State Mode Select Errors
0 Scsi Port5 Bus0/Disk1 Part0 OPEN NORMAL 0 0
1 Scsi Port5 Bus0/Disk1 Part0 OPEN NORMAL 23 0
2 Scsi Port6 Bus0/Disk1 Part0 OPEN NORMAL 0 0
3 Scsi Port6 Bus0/Disk1 Part0 OPEN NORMAL 21 0
5.The output provides information about the connected volumes. In our example, there is
one disk that is connected, Disk 1, and four paths to the disk are available (State = Open).
6.Open the Windows Disk Management window (as shown in Figure 5-35) by clicking
Start  Run. Enter diskmgmt.msc and click OK.
Figure 5-35 Windows Disk Management
Important: Correct SAN switch zoning must be implemented to allow only eight paths
to be visible from the host to any one volume. Volumes with more than this amount are
not supported. For more information, see Chapter 2, “Initial configuration” on page 27.

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7.Right-click the disk in the left pane and select Online if the disk is not online already, as
shown in Figure 5-36.
Figure 5-36 Setting a disk online
8.Right-click the disk again and then click Initialize Disk, as shown in Figure 5-37.
Figure 5-37 Initializing disk
9.Select an initialization option and click OK. In our example, we selected MBR, as shown in
Figure 5-38.
Figure 5-38 Initialize Disk option

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10.Right-click the pane on the right side and click New Simple Volume, as shown in
Figure 5-39.
Figure 5-39 New Simple Volume
11.The New Simple Volume wizard starts, as shown in Figure 5-40.
Figure 5-40 New Volume Wizard
Follow the wizard and the volume is ready to use from your Windows host, as shown in
Figure 5-41 on page 219. In our example, we mapped a 300 GB disk on the IBM Storwize
V3700 to a Windows 2008 host using Fibre Channel connectivity.

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Figure 5-41 Volume is ready to use
Figure 5-42 Windows disk re-scan
The basic setup is now complete and the IBM Storwize V3700 is configured. The host is
prepared and can access the volumes over several paths and can store data on the storage
subsystem.
Windows device discovery: Windows often automatically discovers new devices,
such as disks. If you completed all of the steps that are presented here and do not see
any disks, click Actions  Rescan Disk in Disk Management to discover the new
volumes, as shown in Figure 5-42.

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5.3.2 Windows 2008 iSCSI volume attachment
To perform iSCSI volume attachment in Windows 2008, complete the following steps:
1.Right-click your Windows 2008 iSCSI host in the Hosts view, as shown in Figure 5-43,
click Properties.
Figure 5-43 All Hosts view
Browse to the Mapped Volumes tab, as shown in Figure 5-44
Figure 5-44 Mapped volumes on an iSCSI host

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The host details show you which volumes are mapped to the host. You also can see the
volume UID and the SCSI ID. In our example, one volume with SCSI ID 2 is mapped to the
host.
2.Log on to your Windows 2008 host and click Start  Administrative Tools  iSCSI
Initiator to open the iSCSI Configuration tab, as shown in Figure 5-45.
Figure 5-45 Windows iSCSI Configuration tab
3.Enter the IP address of one of the IBM Storwize V3700 iSCSI ports in the Target field at
the top of the window and click Quick Connect, as shown in Figure 5-46.
iSCSI IP addresses: The iSCSI IP addresses are different for the cluster and canister
IP addresses. They are configured as described in 4.3.3, “Creating iSCSI hosts” on
page 181.

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Figure 5-46 iSCSI Quick Connect
The IBM Storwize V3700 initiator is discovered and connected, as shown in Figure 5-47.
Figure 5-47 iSCSI Initiator target is connected
Click Done to return to the iSCSI Initiator Properties window.
The storage disk is connected to your iSCSI host, but only a single path is used. To enable
multipathing for iSCSI targets, complete the following steps.
4.If MPIO is not already installed on your Windows 2008 host, follow the procedure that is
described in 4.2.1, “Windows 2008 R2: Preparing for Fibre Channel attachment” on
page 153. IBM Sub System Device Driver is not required for iSCSI connectivity.

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5.Click Start  Administrative Tools  MPIO, click the Discover Multi-Paths tab, and
select Add support for iSCSI devices, as shown in Figure 5-48.
Figure 5-48 Enable iSCSI MPIO
6.Click Add and confirm the prompt to reboot your host.
Important: In some cases, the Add support for iSCSI devices option is disabled. To enable
this option, you must have a connection to at least one iSCSI device.

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7.After the reboot process is complete, log on again and click Start  Administrative
Tools  iSCSI Initiator to open the iSCSI Configuration tab. Browse to the Discovery
tab, as shown in Figure 5-49.
Figure 5-49 iSCSI Properties Discovery tab

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8.Click Discover Portal..., enter the IP address of another IBM Storwize V3700 iSCSI port
(as shown in Figure 5-50), and click OK.
Figure 5-50 Discover Target Portal window
9.Return to the Targets tab (as shown in Figure 5-51) and you see that the new connection
there is listed as Inactive.
Figure 5-51 Inactive target ports

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10.Highlight the inactive port and click Connect. The Connect to Target window opens, as
shown in Figure 5-52.
Figure 5-52 Connect to a target
11.Select Enable Multipath and click OK. The second port is now Connected, as shown in
Figure 5-53.
Figure 5-53 Second target port connected
Repeat this step for each IBM Storwize V3700 port you want to use for iSCSI traffic. It is
possible to have up to four port paths to the system.

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12.Open the Windows Disk Management window (as shown in Figure 5-54) by clicking
Start  Run. Enter diskmgmt.msc and then click OK.
Figure 5-54 Windows Disk Management
13.Set the disk online, initialize it, and then create a file system on it as described in step 6 -
10 of 5.3.1, “Windows 2008 Fibre Channel volume attachment” on page 215. The disk is
now ready to use as shown in Figure 5-55. In our example, we mapped a 5 GB disk to a
Windows 2008 host that uses iSCSI connectivity.
Figure 5-55 Windows Disk Management: Disk is ready to use

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5.3.3 Windows 2008 Direct SAS volume attachment
To attach an SAS volume in Windows 2008, complete the following steps:
1.Right-click your Windows 2008 SAS host in the Hosts view (as shown in Figure 5-56) and
select Properties.
Figure 5-56 Windows SAS host from host view
2.Browse to the Mapped Volumes tab, as shown in Figure 5-57.
Figure 5-57 SAS host mapped volumes

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The Mapped Volumes tab shows you which volumes are mapped to the host. You also see
the volume UID and the SCSI ID. In our example, one volume with SCSI ID 0 is mapped to
the host.
3.If MPIO is not installed on your Windows 2008 host and does not have IBM Subsystem
Device Driver installed, follow the procedure that is described in 4.2.1, “Windows 2008 R2:
Preparing for Fibre Channel attachment” on page 153.
4.Log on to your Microsoft host and click Start  All Programs  Subsystem Device
Driver DSM Subsystem Device Driver DSM. A CLI opens. Enter datapath query
device and press Enter to see whether there are IBM Storwize V3700 disks that are
connected to this host, as shown in Example 5-2.
Example 5-2 SDDDSM output SAS attached host
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Program Files\IBM\SDDDSM>datapath query device
Total Devices : 1
DEV#: 0 DEVICE NAME: Disk1 Part0 TYPE: 2145 POLICY: OPTIMIZED
SERIAL: 600507630080009B0000000000000042
============================================================================
Path# Adapter/Hard Disk State Mode Select Errors
0 Scsi Port5 Bus0/Disk1 Part0 OPEN NORMAL 70 0
1 Scsi Port5 Bus0/Disk1 Part0 OPEN NORMAL 0 0
C:\Program Files\IBM\SDDDSM>
5.The output provides information about the connected volumes. In our example, there is
one disk that is connected, Disk 1, and two paths to the disk are available (State = Open).
6.Open the Windows Disk Management window (as shown in Figure 5-58) by clicking
Start  Run. Enter diskmgmt.msc and then click OK.
Figure 5-58 Windows disk management

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7.Right-click the disk in the left pane and select Online if the disk is not online, as shown in
Figure 5-59.
Figure 5-59 Setting volume online
8.Right-click the disk again and then click Initialize Disk, as shown in Figure 5-60.
Figure 5-60 Initializing disk
9.Select an initialization option and click OK. In our example, we selected MBR, as shown in
Figure 5-61.
Figure 5-61 Initialize disk option

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10.Right-click the pane on the right side and click New Simple Volume, as shown in
Figure 5-62.
Figure 5-62 New simple volume - SAS attach
11.The New Simple Volume wizard start, as shown in Figure 5-63.
Figure 5-63 Simple volume wizard
Follow the wizard and the volume is ready to use from your Windows host, as shown in
Figure 5-64 on page 232. In our example, we mapped a 100 GB disk on the IBM Storwize
V3700 to a Windows 2008 host using SAS direct attach connectivity.

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Figure 5-64 SAS attached volume ready to use.
5.3.4 VMware ESX Fibre Channel volume attachment
To perform VMware ESX Fibre Channel attachment, complete the following steps:
1.Right-click your VMware ESX Fibre Channel host in the Hosts view (as shown in
Figure 5-65) and select Properties.
Figure 5-65 Example ESX FC host

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2.Browse to the Mapped Volumes tab, as shown in Figure 5-66.
Figure 5-66 Mapped volumes to ESX FC host
In the Host Details window, there are two volumes that are connected to the ESX FC host
that uses SCSI ID 0 and SCSI ID 1. The UID of the volumes is also displayed.
3.Connect to your VMware ESX Server by using the vSphere client. Browse to the
Configuration tab and select Storage Adapters, as shown in Figure 5-67.
Figure 5-67 vSphere Client: Storage adapters

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Implementing the IBM Storwize V3700
4.Click Rescan All... in the upper right hand corner and click OK in the resulting pop-up
window, as shown in Figure 5-68. This scans for new storage devices.
Figure 5-68 Rescan
The mapped volumes on the IBM Storwize V3700 should now appear against the Fibre
Channel adapters.
5.Select Storage and click Add Storage, as shown in Figure 5-69.
Figure 5-69 vSphere Client: Storage  Add Storage

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6.The Add Storage wizard opens. Click Select Disk/LUN and click Next. The IBM Storwize
V3700 disks appear, as shown in Figure 5-70. In our example, they are the Fibre Channel
Disks. We continue with the 500GB volume. Highlight and click Next.
Figure 5-70 Select FC Disk

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7.Select a File System version option. In our example, we selected VMFS-5, as shown in
Figure 5-71.
Figure 5-71 Select File System Type

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8.Click Next to move through the wizard. A summary window of the current disk layout is
shown, followed by the option to name the new Datastore. In our example, we chose
RedbookTestOne, as shown in Figure 5-72.
Figure 5-72 Enter a Datastore name

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Implementing the IBM Storwize V3700
9.Click Next and the final window is the choice of creating the datastore with the default
maximum size of the volume or a proportion of it. After you click Finish, the wizard closes
and you return to the storage view. In Figure 5-73, you see that the new volume was
added to the configuration.
Figure 5-73 Add Storage task complete
10.Highlight the new Datastore and click Properties (as shown in Figure 5-74) to see the
details of the Datastore, as shown in Figure 5-75 on page 239.
Figure 5-74 Datastore properties

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239
Figure 5-75 Datastore property details
11.Click Manage Paths to customize the multipath settings. Select Round Robin (as shown
in Figure 5-76) and click Change.
Figure 5-76 Select a Datastore multipath setting

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Implementing the IBM Storwize V3700
When the change completes, click Closed and the storage disk is available and ready to use
with your VMware ESX server that uses Fibre Channel attachment.
5.3.5 VMware ESX iSCSI volume attachment
To perform a VMware ESX iSCSI attachment, complete the following steps:
1.Right-click your VMware ESX iSCSI host in the Hosts view (as shown in Figure 5-77) and
select Properties.
Figure 5-77 Select iSCSI ESX host properties
2.Browse to the Mapped Volumes tab, as shown in Figure 5-78.

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Figure 5-78 iSCSI ESX host properties
In the Host Details window, you see that there is one volume that is connected to the ESX
iSCSI host that uses SCSI ID 1. The UID of the volume is also displayed.
3.Connect to your VMware ESX Server by using the vSphere Client. Browse to the
Configuration tab and select Storage Adapters, as shown in Figure 5-79.
Figure 5-79 Storage Adapters

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4.Highlight the iSCSI Software Adapter and click Properties. The iSCSI initiator properties
window opens. Select the Dynamic Discovery tab (as shown in Figure 5-80) and click
Add.
Figure 5-80 iSCSI Initiator properties
5.To add a target, enter the target IP address, as shown in Figure 5-81 on page 243. The
target IP address is the iSCSI IP address of a node in the I/O Group from which you are
mapping the iSCSI volume. Leave the IP port number at the default value of 3260 and click
OK. The connection between the initiator and target is established.

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Figure 5-81 Enter a target IP address
Repeat this step for each IBM Storwize V3700 iSCSI port you want to use for iSCSI
connections.
6.After you add all the ports that are required, close the iSCSI Initiator properties by clicking
Close, as shown in Figure 5-80 on page 242.
You are prompted to rescan for new storage devices. Confirm the scan by clicking Yes, as
shown in Figure 5-82 on page 244.
iSCSI IP addresses: The iSCSI IP addresses are different for the cluster and canister
IP addresses. They are configured as described in 4.3.3, “Creating iSCSI hosts” on
page 181.

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Figure 5-82 Confirm the rescan
7.Go to the storage view and click Add Storage. The Add Storage wizard opens, as shown
in Figure 5-83. Select Disk/LUN and then click Next.
Figure 5-83 vSphere Client: Storage  Add Storage

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8.The new iSCSI LUN displays. Highlight it and click Next, as shown in Figure 5-84.
Figure 5-84 Select iSCSI LUN

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9.Select a File System version option. In our example, we selected VMFS-5, as shown in
Figure 5-85.
Figure 5-85 Select file system type

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10.Review the disk layout and click Next, as shown in Figure 5-86.
Figure 5-86 Current Disk Layout

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11.Enter a name for the Datastore and click Next, as shown in Figure 5-87.
Figure 5-87 Enter a Datastore name

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12.Select the Maximum available space and click Next, as shown in Figure 5-88.
Figure 5-88 Select capacity

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13.Review your selections and click Finish, as shown in Figure 5-89.
Figure 5-89 Finish the wizard
The process starts to add an iSCSI LUN, which can take a few minutes. After the tasks
complete, the new Datastore appears in the storage view, as shown in Figure 5-90.
Figure 5-90 New Datastore available

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251
14.Highlight the new Datastore and click Properties to open and review the Datastore
settings, as shown in Figure 5-91.
Figure 5-91 Datastore properties
15.Click Manage Paths, select Round Robin as the multipath policy (as shown in
Figure 5-92), and click Change.
Figure 5-92 Change the multipath policy

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16.Click Close twice to return to the storage view. The storage disk now is available and
ready to use for your VMware ESX server that uses an iSCSI attachment.
5.3.6 VMware ESX Direct SAS volume attachment
To perform VMware ESX Direct SAS attachment, complete the following steps:
1.Right-click your VMware ESX SAS host in the Hosts view (as shown in Figure 5-93) and
select Properties.
Figure 5-93 Example ESX SAS host
2.Browse to the Mapped Volumes tab, as shown in Figure 5-94.

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Figure 5-94 Mapped volumes to ESX SAS host
In the Host Details window, there is one volume that is connected to the ESX SAS host
that use SCSI ID 0. The UID of the volume is also displayed.
3.Connect to your VMware ESX Server by using the vSphere client. Browse to the
Configuration tab and select Storage Adapters, as shown in Figure 5-95.
Figure 5-95 vSphere Client: Storage adapters
4.Click Rescan All... in the upper right corner and click OK in the resulting pop-up window,
as shown in Figure 5-96. This scans for new storage devices.

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Figure 5-96 Rescan
The mapped volumes on the IBM Storwize V3700 should now appear against the SAS
adapters.
5.Select Storage and click Add Storage, as shown in Figure 5-97.
Figure 5-97 Storage  Add Storage

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255
6.The Add Storage wizard opens. Click Select Disk/LUN and click Next. The IBM Storwize
V3700 disks appear, as shown in Figure 5-98. In our example, it is the SAS Disk. Highlight
and click Next.
Figure 5-98 Select SAS Disk

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7.Select a File System version option. In our example, we selected VMFS-5, as shown in
Figure 5-99.
Figure 5-99 Select File System Type

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257
8.Click Next to move through the wizard. A summary window of the current disk layout is
shown, followed by the option to name the new Datastore. In our example, we chose
RedbookTestThree, as shown in Figure 5-100.
Figure 5-100 Adding Datastore name

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9.Click Next and the final window is the choice of creating the datastore with the default
maximum size of the volume or a proportion of it. After you click Finish, the wizard closes
and you return to the storage view. In Figure 5-101, you see that the new volume was
added to the configuration.
Figure 5-101 Add Storage task complete
10.Highlight the new Datastore and click Properties (as shown in Figure 5-102) to see the
details of the Datastore, as shown in Figure 5-103 on page 259.
Figure 5-102 Datastore properties

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Figure 5-103 Datastore property details
11.Click Manage Paths to customize the multipath settings. Select Round Robin (as shown
in Figure 5-104 on page 259) and click Change.
Figure 5-104 Select a Datastore multipath setting

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When the change completes, click Close and the storage disk is available and ready to use
with your VMware ESX server that uses Fibre Channel attachment.

© Copyright IBM Corp. 2013. All rights reserved.
261
Chapter 6.
Storage migration wizard
This chapter describes the steps that are required to migrate data from older storage systems
to the IBM Storwize V3700 by using the built-in Storage Migration Wizard. Migrating data from
older storage systems to the Storwize V3700 storage system enables the benefits of the
Storwize V3700 functionality, such as the easy-to-use GUI, internal virtualization, thin
provisioning, and FlashCopy to be realized.
This chapter includes the following topics:
Interoperability and compatibility
Storage migration wizard
Storage migration wizard example scenario
6

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6.1 Interoperability and compatibility
Interoperability is an important consideration when a new storage system is set up in an
environment that contains existing storage infrastructure. In this section, we show how to
check that the storage environment, the older storage system, and IBM Storwize V3700 are
ready for the data migration process.
To ensure system interoperability and compatibility between all elements that are connected
to the SAN fabric, check the proposed configuration with the IBM System Storage
Interoperation Center (SSIC). SSIC can confirm whether the solution is supported and provide
recommendations for hardware and software levels.
If the required configuration is not listed for support in the SSIC, contact your IBM marketing
representative and a Request for Price quotation (RPQ) for your specific configuration.
For more information about the IBM SSIC, see this website:
http://www-03.ibm.com/systems/support/storage/ssic/interoperability.wss
6.2 Storage migration wizard
The Storwize V3700 storage migration wizard simplifies the migration process. The wizard
consists of easy-to-follow panels to guide users. This process involves external virtualization
of the older storage system (in our example, an IBM DS3400) and performing an online
migration. After data migration is complete, the older storage system is removed from
Storwize V3700 control and can be retired.
6.2.1 External virtualization capability
To migrate data from an older storage system to the Storwize V3700, it is necessary to make
use of the built-in external virtualization capability of the Storwize V3700. This capability
places external Fibre Channel connected Logical Units (LU) under the control of the Storwize
V3700.
6.2.2 Overview of the storage migration wizard
The overall storage migration wizard process includes the following stages:
The older storage systems divide storage into many Small Computer System Interface
(SCSI) LUs that are presented on a Fibre Channel SAN to hosts.
I/O to the LUs is stopped and changes are made to the mapping of the storage system LUs
and to the SAN fabric zoning so that the original LUs are presented directly to the Storwize
V3700. The Storwize V3700 discovers the external LUs as unmanaged MDisks.
The unmanaged MDisks are then imported to the Storwize V3700 as image mode MDisks
and placed into a storage pool. This storage pool is now a logical container for the
SAN-attached LUs.
Important: The IBM Storwize V3700 supports only external storage virtualization for the
purposes of data migration.

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Image mode volumes are created from the image mode MDisks. Each volume has a
one-to-one mapping with an image mode MDisk. From a data perspective, the image
mode volume represents the SAN-attached LU exactly as it was before the import
operation. The image mode volume is on the same physical drives of the older storage
system and the data remains unchanged. The Storwize V3700 is presenting active images
of the SAN-attached LUs.
The hosts have the older storage system multipath device driver removed and are then
configured for Storwize V3700 attachment. Further zoning changes are made for
host-to-V3700 SAN connections. The Storwize V3700 hosts are defined with worldwide
port names (WWPNs) and the image mode volumes are mapped. After the volumes are
mapped, the hosts discover the Storwize V3700 volumes through a host rescan device or
reboot operation.
Storwize V3700 volume mirror operations are then initiated. The image mode volumes are
mirrored to generic Storwize V3700 volumes. The generic volumes are from user
nominated internal storage pools. The mirrors are online migration tasks, which means
hosts can access and use the volumes during the mirror synchronization process.
After the mirror operations are complete, the migrations are then finalized by the user. The
finalization process is seamless and it removes the volume mirror relationships and the
image mode volumes. The older storage system LUs are now migrated and the Storwize
V3700 control of those old LUs can be removed. The older storage system can then be
retired.
6.2.3 Storage migration wizard tasks
The storage migration wizard is designed for the easy and nondisruptive migration of data
from an older storage system to the internal capacity of the Storwize V3700.
This section describes the following storage migration wizard tasks:
Avoiding data loss
Accessing the storage migration wizard
Step 1: Before you begin
Step 2: Prepare environment for migration
Step 3: Map storage
Step 4: Migrating MDisks
Step 5: Configure hosts
Step 6: Map volumes to hosts
Step 7: Select storage pool
Step 8: Finish the storage migration wizard
Finalize migrated volumes
Avoiding data loss
The risk of losing data when the storage migration wizard is used correctly is low. However, it
is prudent to avoid potential data loss by creating a backup of all the data that is stored on the
hosts, the older storage systems, and the Storwize V3700 before the wizard is used.
Accessing the storage migration wizard
Select System Migration in the Pools menu to open the System Migration panel, as shown in
Figure 6-1 on page 264. The System Migration panel provides access to the storage
migration wizard and displays the migration progress information.

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Figure 6-1 Pool menu
Click Start New Migration and the storage migration wizard is started. Figure 6-2 shows the
System Migration panel.
Figure 6-2 System Migration Panel

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Step 1: Before you begin
Follow step 1 of the storage migration wizard in which the restrictions and prerequisites are
described. Read and select each restriction and prerequisite that applies to the planned
migration, as shown in Figure 6-3.
Figure 6-3 Step 1 of the storage migration wizard, with all options selected
Restrictions
Confirm that the following restrictions apply:
I am not using the storage migration wizard to migrate cluster hosts, including clusters of
VMware hosts and VIOS.
I am not using the storage migration wizard to migrate SAN Boot images.
If the restrictions cannot be selected, the migration must be performed outside of this wizard
because more steps are required. For more information about this topic, see the IBM
Storwize V3700 Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.641.doc%2Fv3700_ichome_641.html
The VMware ESX Storage vMotion feature might be an alternative for migrating VMware
clusters. For more information about this topic, see this website:
http://www.vmware.com/products/vmotion/overview.html

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Prerequisites
Confirm that the following prerequisites apply:
Make sure that the Storwize V3700, older storage system, hosts, and Fibre Channel ports
are physically connected to the SAN fabrics.
If there are VMware ESX hosts involved in the data migration, make sure that the VMware
ESX hosts are set to allow volume copies to be recognized. For more information, see the
VMware ESX product documentation at this website:
http://www.vmware.com/support/pubs/vsphere-esxi-vcenter-server-pubs.html?
If all options can be selected, click Next to continue. If there are circumstances that prevent
one or other of the options from being selected, the Next button remains inactive. The wizard
does not progress and the data must be migrated without use of this wizard.
Step 2: Prepare environment for migration
Follow step 2 of the wizard carefully. When all of the required tasks are complete, click Next
to continue. Figure 6-4 shows the Prepare Environment for Migration panel.
Figure 6-4 Storage Migration Wizard
Step 3: Map storage
In step 3 of the wizard record all of the details relating to host WWPNs, volume mapping, and
SCSI IDs. Record the information carefully because it can be used in later panels. Figure 6-5
on page 267 shows the Map Storage panel.

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Figure 6-5 Map Storage Panel
Table 6-1 shows an example table for capturing the information that relates to older storage
system LUs.
Table 6-1 Example table for capturing external LU information
LU Name Controller Array SCSI ID Host name Capacity
MCRPRDW2K801 DS3400_01 Array_01 0 MCRPRDW2K8 50 GB
MCRPRDW2K802 DS3400_01 Array_01 1 MCRPRDW2K8 200 GB
MCRPRDLNX01 DS3400_01 Array_02 0 MCRPRDLNX 100 GB
MCRPRDLNX02 DS3400_01 Array_02 1 MCRPRDLNX 300 GB
SCSI ID: Record the SCSI ID of the LUs to which the host is originally mapped. Some
operating systems do not support changing the SCSI ID during the migration.

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Table 6-2 shows an example table for capturing host information.
Table 6-2 Example table for capturing host information
When all the data is captured and the volume mappings are changed, click Next to continue.
The Storwize V3700 runs the discover devices task. After the task is complete, click Close to
continue. Figure 6-6 shows the results of the discover devices task.
Figure 6-6 Discover Devices task
Host Name/
LU Names
Adapter / Slot / Port WWPN HBA
F/W
HBA
Device
Driver
Operating
System
V3700
Multipath
Software
MCRPRDW2K8 QLE2562 / 2 / 1 21000024FF2D0BE8 2.10 9.1.9.25 W2K8 R2
SP1
SDDDSM
2.4.3.1-2
MCRPRDW2K8 QLE2562 / 2 / 2 21000024FF2D0BE9 2.10 9.1.9.25 W2K8 R2
SP1
SSDDSM
2.4.3.1-2
MCRPRDLNX LP10000 / 0 / 1 10000000C1234A56 2.72a2 8.2.0.63.3p RHEL5 Device
Mapper
MCRPRDLNX LP10000 / 1 / 1 10000000C6789A01 2.72a2 8.2.0.63.3p RHEL5 Device
Mapper

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Step 4: Migrating MDisks
Follow step 4 of the wizard and select the MDisks that are to be migrated and then click Next
to continue. Figure 6-7 shows the Migrating MDisks panel.
Figure 6-7 Migrating MDisks panel
The IBM Storwize V3700 then runs the import MDisks task. After the task is complete, click
Close to continue. Figure 6-8 on page 270 shows the result of the import MDisks task.
MDisk selection: Select only the MDisks that are applicable to the current migration plan.
After step 8 of the current migration is complete, another migration plan can be started to
migrate any remaining MDisks.

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Figure 6-8 Import MDisks task
Step 5: Configure hosts
Follow step 5 of the wizard to select or configure new hosts, as required. Click Next to
continue. Figure 6-9 shows the configure hosts panel.
Figure 6-9 Configure hosts panel

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Step 6: Map volumes to hosts
Follow step 6 of the wizard to select the newly migrated volume. Click Map to Host.
Figure 6-10 shows the Map Volumes to Hosts panel.
Figure 6-10 Map Volumes to Hosts panel
The image mode volumes are listed and the names of the image mode volumes are assigned
automatically by the Storwize V3700 storage system. The names can be changed to reflect
something more meaningful to the user by selecting the volume and clicking Rename in the
Actions menu.
A Host menu is displayed as shown in Figure 6-11 on page 272.
Important: It is not mandatory to select the hosts now. The actual selection of the hosts
occurs in the next step, Map Volumes to Hosts. However, take this opportunity to
cross-check the hosts that have data to be migrated by highlighting them in the list before
you click Next.
Names: The names of the image mode volumes must begin with a letter. The name can be
a maximum of 63 characters. The following valid characters can be used:
Uppercase letters (A-Z)
Lowercase letters (a-z)
Digits (0 -9)
Underscore (_)
Period (.)
Hyphen (-)
Blank space
The names must not begin or end with a space.

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Figure 6-11 Modify Host Mappings pop-up
Select the required host and the Modify Host Mappings panel is opened, as shown in
Figure 6-12. The MDisks highlighted in step 6 of the wizard are shown in yellow on the Modify
Host Mappings panel. The yellow highlighting means that the volumes are not yet mapped to
the host. Click the volume and then Edit SCSI ID and modify as required. The SCSI ID should
reflect the same SCSI ID as was recorded in step 3. Click Map Volume to complete the
mapping.
Figure 6-12 Modify Host Mappings panel

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The Storwize V3700 runs the modify mappings task. After the task is complete, the volume is
mapped to the host. Figure 6-13 shows the Modify Mappings task. Click Close to continue.
Figure 6-13 Modify Mappings task
The Map Volumes to Hosts panel is displayed again as shown in Figure 6-14. Verify that
migrated volumes now have Yes in the Host Mappings column. Click Next to continue.
Figure 6-14 Map Volumes to Hosts panel that shows Yes in the Host Mappings column
Scan for new devices on the hosts to verify the mapping. The disks are now displayed as IBM
2145 Multi-Path disk devices. This disk device type is common for the IBM Storwize disk
family and the IBM SAN Volume Controller.

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Step 7: Select storage pool
Follow step 7 of the wizard to select an internal storage pool. The destination storage pool of
the data migration is an internal storage pool of the Storwize V3700. Ensure that there is
enough space in the selected storage pool to accommodate the migrated volume. The
migration task runs in the background and results in a copy of the data being placed on the
MDisks in the selected storage pool.
The process uses the volume mirroring function that is included with the Storwize V3700.
Figure 6-15 shows the Select Storage Pool panel. Click Next to continue.
Figure 6-15 Select Storage Pool panel
The Storwize V3700 runs the start migration task. After the task is complete, click Close to
continue. Figure 6-16 shows the result of the Start Migration task.
Figure 6-16 Start Migration task

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Step 8: Finish the storage migration wizard
Step 8 of the wizard gives final instructions to complete the migration. Click Finish to exit the
wizard as shown in Figure 6-17.
Figure 6-17 Step 8 of the storage migration wizard
The end of the storage migration wizard is not the end of the data migration. The data
migration is still in progress. A percentage indication of the migration progress is displayed in
the System Migration panel, as shown in Figure 6-18.
Figure 6-18 Storage Migration panel with a migration in progress
Finalize migrated volumes
When the migration completes, select the Migration and right-click Finalize. Verify the volume
names and the number of migrations and click OK. The image mode volumes are deleted and
the associated image mode MDisks from the migration storage pool are removed. The status
of those image mode MDisks is then unmanaged. When the finalization completes, the data
migration to the IBM Storwize V3700 is done. Remove the zoning to the older storage and
retire the system.

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6.3 Storage migration wizard example scenario
This section describes an example scenario that provides some details that relate to the
attachment and verification tasks that are associated with running the storage migration
wizard.
6.3.1 Storage migration wizard example scenario description
The example scenario we use shows the introduction of a Storwize V3700 to an environment
that contains existing storage infrastructure including a SAN fabric, a Windows 2008 host,
and an IBM DS3400 storage system.
The Windows 2008 host has existing data on the disks of an IBM DS3400 storage system.
That data must be migrated to the internal storage of the Storwize V3700. The Windows 2008
host has a dual port QLogic Host Bus Adapter (HBA) type QLE2562. Each of the Fibre
Channel switches is IBM 2498-24B. There are two host disks to be migrated, Disk 1 and Disk
2. Figure 6-19 shows the Windows 2008 Disk management panel. The two disks feature
defined volumes. The volume labels are Migration 1 (G: drive) and Migration 2 (H: drive).
Figure 6-19 Windows 2008 disk management panel
The two disks to be migrated are on the IBM DS3400 storage system. Therefore, the disk
properties display the disk device type as an IBM1726-4xx FAStT disk device. To show this
disk attribute, right-click the disk to show the menu and then select Properties, as shown in
Figure 6-20.
Figure 6-20 Display properties of disk before migration

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After the disk properties panel is opened, the General tab shows the disk device type.
Figure 6-21 shows the General tab in the Windows 2008 Disk Properties window.
Figure 6-21 Window 2008 Disk Properties: General tab
Perform this task on all disks before the migration. Performing this same task after the
Storwize V3700 mapping and host rescan, the disk device definitions change to IBM 2145
Multi-Path disk device and confirm that the disks are under Storwize V3700 control.
Example scenario Fibre Channel cabling layout
Figure 6-22 on page 278 shows the Fibre Channel cabling layout to provide more information
about the example migration. The Host, IBM DS3400, and Storwize V3700 are cabled into a
dual SAN fabric configuration. The connection method shown can provide improved
availability through fabric and path redundancy and improved performance through workload
balancing.

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Figure 6-22 Example scenario Fibre Channel cabling layout
6.3.2 Using the storage migration wizard for example scenario
This section provides an overview of the storage migration tasks that are performed when the
storage migration wizard is used for the example scenario.
Overview of storage migration wizard tasks for example scenario
The following steps provide an overview of the wizard tasks for our example scenario:
1.Search the IBM SSIC for scenario compatibility.
2.Back up all of the data that is associated with the host, DS3400, and Storwize V3700.
3.Start New Migration wizard on the Storwize V3700.
4.Check the restrictions in Step 1 of the wizard.
5.Follow Step 2 in the wizard to prepare the environment for migration, including the
following steps:
a.Stop host operations or stop all I/O to volumes that you are migrating.

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b.Remove zones between the hosts and the storage system from which you are
migrating in our case remove the Host-to-DS3400 zones on SAN.
c.Update your host device drivers, including your multipath driver and configure them for
attachment to the IBM Storwize V3700 system. Complete the steps that are described
in 4.2.1, “Windows 2008 R2: Preparing for Fibre Channel attachment” on page 153 to
connect to Storwize V3700 using Fibre Channel.
Pay careful attention to the following tasks:
• Make sure that the latest OS service pack and test fixes are applied to your
Microsoft server.
• Use the latest firmware and driver levels on your host system.
• Install HBA or HBAs on the Windows server that use the latest BIOS and drivers.
• Configure the HBA for hosts that are running Windows.
• Set the Windows timeout value
• Install the Subsystem Device Driver Device Specific Module (SDDDSM) multipath
module.
• Connect the FC Host Adapter ports to the switches.
• Configure the switches (zoning).
d.Create a storage system zone between the storage system that is to be migrated and
the IBM Storwize V3700 system and host zones for the hosts that are to be migrated.
Pay careful attention to the following tasks:
• Locate the WWPNs for Host.
• Locate WWPNs for IBM DS3400
• Locate WWPNs for Storwize V3700
• Define port aliases definitions on SAN.
• Add V3700-to-DS3400 zones on SAN.
• Add Host-to-V3700 zones on SAN.
e.Create a host or host group in the external storage system with the WWPNs for this
system.
Add Storwize V3700 host group on DS3400
f.Configure the storage system for use with the IBM Storwize V3700 system.
Follow the IBM Storwize V3700 Information Center for DS3400 configuration
recommendations.
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.i
bm.storwize.v3700.710.doc%2Fsvc_configdiskcontrollersovr_22n9uf.html
6.Follow Step 3 of the wizard to map storage, including the following steps:
a.Create a list of all external storage system volumes that are migrated.
Create a DS3400 LU table.
b.Record the hosts that use each volume.
Create Host table.
Important: If you cannot restrict volume access to specific hosts by using the
external storage system, all volumes on the system must be migrated.

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c.Record the WWPNs that are associated with each host.
Add WWPNs to Host table.
d.Unmap all volumes that are migrated from the hosts in the storage system and map
them to the host or host group that you created when your environment was prepared.
Move LUs from Host to Storwize V3700 Host Group on DS3400.
e.Record the storage system LUN that is used to map each volume to this system.
Update the DS3400 LU table.
7.Follow Step 4 of the wizard to migrate MDisks. Select discovered MDisks on the IBM
Storwize V3700.
8.In Step 5 of the wizard, configure hosts by completing the following steps:
a.Create Hosts on Storwize V3700
b.Select Hosts on Storwize V3700
9.In Step 6 of the wizard, map volumes to hosts by completing the following steps:
a.Map volumes to Host on Storwize V3700
b.Verify disk device type is now 2145 on Host
c.SDDDSM datapath query commands on Host
10.In Step 7 of the wizard, select the storage pool on the IBM Storwize V3700 to create the
mirror copies in as part of the background data migration task.
11.Finish the storage migration wizard.
12.Finalize the migrated volumes.
Detailed view of the storage migration wizard for the example scenario
The following steps provide more information about the wizard tasks for our example
scenario:
1.Search the IBM SSIC for scenario compatibility.
2.Back up all of the data that is associated with the host, DS3400, and Storwize V3700.
3.Start New Migration to open the wizard on the Storwize V3700, as shown in Figure 6-23.
Figure 6-23 Start new migration
Important: If you cannot restrict volume access to specific hosts by using the
external storage system, all volumes on the system must be migrated.

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4.Follow step 1 of the wizard and select all of the restrictions and prerequisites, as shown in
Figure 6-24. Click Next to continue.
Figure 6-24 Storage migration wizard: Step 1

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5.Follow step 2 of the wizard, as shown in Figure 6-25. Complete all of the steps to before
you continue.
Figure 6-25 Storage Migration Wizard: Step 2
Pay careful attention to the following tasks:
a.Stop host operations or stop all I/O to volumes that you are migrating.
b.Remove zones between the hosts and the storage system from which you are
migrating.
c.Update your host device drivers, including your multipath driver and configure them for
attachment to this system. Complete the steps that are described in 4.2.1, “Windows
2008 R2: Preparing for Fibre Channel attachment” on page 153 to prepare a Windows
host to connect to Storwize V3700 by using Fibre Channel.
Pay careful attention to the following tasks:
• Make sure that the latest OS service pack and test fixes are applied to your
Microsoft server.
• Use the latest firmware and driver levels on your host system.
• Install host bus adapters (HBAs) on the Windows server that uses the latest BIOS
and drivers.
• Connect the FC Host Adapter ports to the switches.
• Configure the switches (zoning).
• Configure the HBA for hosts that are running Windows.
• Set the Windows timeout value.
• Install the multipath module.

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d.Create a storage system zone between the storage system that is migrated and this
system, and host zones for the hosts that are migrated.
To perform this step, locate the WWPNs of the host, IBM DS3400, and Storwize
V3700, then create an alias for each port to simplify the zone creation steps.
Locating the HBA WWPNs on the Windows 2008 host
Refer to the original IBM DS3400 Host definition to locate the WWPNs of the host’s dual port
QLE2562 HBA. To complete this task, open the IBM DS3400 Storage Manager and click the
Modify tab, as shown in Figure 6-26. Select Edit Host Topology to show the host definitions.
Figure 6-26 IBM DS3400 modify tab: Edit Host Topology
Figure 6-27 shows the IBM DS3400 storage manager host definition and the associated
WWPNs.
Figure 6-27 IBM DS3400 host definition
Record the WWPNs for alias, zoning, and the Storwize V3700 New Host task.
Locating the controller WWPNs on the IBM DS3400
The IBM DS3400 Storage Manager can provide the controller WWPNs through the Storage
Subsystem Profile. Open the IBM DS3400 Storage Manager, click Support, and select View
Storage Subsystem Profile. Figure 6-28 shows the IBM DS3400 Storage Manager Support
tab.
Important: A WWPN is a unique identifier for each Fibre Channel port that is
presented to the SAN fabric.
Important: Alternatively, the QLogic SAN Surfer application for the QLogic HBAs or the
SAN fabric switch reports can be used to locate the host’s WWPNs.

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Figure 6-28 IBM Storage Manager: view storage subsystem profile
Click the Controllers tab to show the WWPNs for each controller. Figure 6-29 shows the IBM
DS3400 storage manager storage subsystem profile.
Figure 6-29 Storage subsystem profile: Controller WWPNs
Locating node canister WWPNs on the Storwize V3700
To locate the WWPNs for the Storwize V3700 node canisters, expand the control enclosure
section and select the canister from the System Details panel. Scroll down to Ports to see the

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associated WWPNs. Figure 6-30 on page 285 shows the Storwize V3700 System Details
panel with the WWPNs shown for Enclosure 1  Canister 1.
Figure 6-30 Storwize V3700 node canister WWPNs information
Example scenario Storwize V3700 and IBM DS3400 WWPN diagram
Each port on the Storwize V3700 and IBM DS3400 has a unique and persistent WWPN. This
configuration means if an HA in the storage system is replaced, the new HA presents the
same WWPNs as the old HA. This configuration means that if you understand the WWPN of
a port, you can match it to the storage system and the Fibre Channel port. Figure 6-31 on
page 286 shows the relationship between the device WWPNs and the Fibre Channel ports for
the Storwize V3700 and the IBM DS3400 that are used in the example scenario as shown in
Figure 6-31 on page 286.
WWPN: The WWPN is made up of eight bytes (two digits per byte). In Figure 6-30, the
third last byte in the listed WWPNs are 04, 08, 0C, and 10. They are the differing bytes for
each WWPN only. Also, the last two bytes in the listed example of 08CE are unique for
each node canister. Noticing these types of patterns can help when you are zoning or
troubleshooting SAN issues.

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Figure 6-31 Example scenario Storwize V3700 and IBM DS3400 WWPN location diagram
Zoning: Define aliases on the SAN fabrics
Now that the WWPNs for Storwize V3700, IBM DS3400, and Windows 2008 host are located,
you can define the WWPN aliases on the SAN fabrics for the Storwize V3700. DS3400 and
Windows 2008 host aliases also can be created if necessary. Aliases can simplify the zone
creation process. Create an alias name for each interface, then add the WWPN.
Aliases can contain the FC Switch Port to which the device is attached, or the attached
device’s WWPN. In this example scenario, WWPN-based zoning is used instead of
port-based zoning. Either method can be used; however, it is best not to intermix the methods
and keep the zoning configuration consistent throughout the fabric.
When WWPN-based zoning is used, be mindful that when host HBA cards are replaced,
occasions can occur when a new HBA card contains new WWPNs. Consequently, the
previously defined aliases must be modified to match the new card. This situation is not the
case for IBM Storage Systems because they use persistent WWPNs, which means that the
WWPNs remain unchanged after an HBA card is replaced.
The following alias definitions are used in our example:
Storwize V3700 ports connected to SAN Fabric A:
alias= V3700_Canister_Left_Port1 wwpn= 50:05:07:68:03:04:26:CE
alias= V3700_Canister_Left_Port3 wwpn= 50:05:07:68:03:0C:26:CE
alias= V3700_Canister_Right_Port1 wwpn= 50:05:07:68:03:04:26:CF

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alias= V3700_Canister_Right_Port3 wwpn= 50:05:07:68:03:0C:26:CF
Storwize V3700 ports connected to SAN Fabric B:
alias= V3700_Canister_Left_Port2 wwpn= 50:05:07:68:03:08:26:CE
alias= V3700_Canister_Left_Port4 wwpn= 50:05:07:68:03:10:26:CE
alias= V3700_Canister_Right_Port2 wwpn= 50:05:07:68:03:08:26:CF
alias= V3700_Canister_Right_Port4 wwpn= 50:05:07:68:03:10:26:CF
IBM DS3400 ports connected to SAN Fabric A:
alias= DS3400_CTRLA_FC1 wwpn= 20:26:00:A0:B8:75:DD:0E
alias= DS3400_CTRLB_FC1 wwpn= 20:27:00:A0:B8:75:DD:0E
IBM DS3400 ports connected to SAN Fabric B:
alias= DS3400_CTRLA_FC2 wwpn= 20:36:00:A0:B8:75:DD:0E
alias= DS3400_CTRLB_FC2 wwpn= 20:37:00:A0:B8:75:DD:0E
Window 2008 HBA port connected to SAN Fabric A:
alias= W2K8_HOST_P2 wwpn= 21:00:00:24:FF:2D:0B:E9
Window 2008 HBA port connected to SAN Fabric B:
alias= W2K8_HOST_P1 wwpn= 21:00:00:24:FF:2D:0B:E8
Zoning: Define the V3700-to-DS3400 zones on the SAN fabrics
Define the V3700-to-DS3400 zones on the SAN fabrics. The best way to zone
DS3400-to-V3700 connections is to ensure that the IBM DS3400 controllers are not in the
same zone. The zoning configuration in the following example shows the two zones per fabric
that are necessary to ensure that the IBM DS3400 controllers are not in the same zone. Also,
all Storwize V3700 node canisters must detect the same ports on IBM DS3400 storage
system.
FABRIC A
Zone name= ALL_V3700_to_DS3400_CTRLA_FC1:
DS3400_CTRLA_FC1
V3700_Canister_Left_Port1
V3700_Canister_Left_Port3
V3700_Canister_Right_Port1
V3700_Canister_Right_Port3
Zone name= ALL_V3700_to_DS3400_CTRLB_FC1:
DS3400_CTRLB_FC1
V3700_Canister_Left_Port1
V3700_Canister_Left_Port3
V3700_Canister_Right_Port1
V3700_Canister_Right_Port3
FABRIC B
Zone name= ALL_V3700_to_DS3400_CTRLA_FC2:
DS3400_CTRLA_FC2
V3700_Canister_Left_Port2
V3700_Canister_Left_Port4
V3700_Canister_Right_Port2
V3700_Canister_Right_Port4
Zone name= ALL_V3700_to_DS3400_CTRLB_FC2:
DS3400_CTRLB_FC2
V3700_Canister_Left_Port2
V3700_Canister_Left_Port4
V3700_Canister_Right_Port2
V3700_Canister_Right_Port4

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Zoning: Define the Host-to-V3700 zones on the SAN fabrics
Define the Host-to-V3700 zones on each of the SAN fabrics. Zone each Host HBA port with
one port from each node canister. This configuration provides four paths to the Windows 2008
host. The SDDDSM multipath software optimizes the host to use all four paths, as shown in
the following example:
FABRIC A
Zone name= W2K8_HOST_P2_to_V3700_Port1s:
W2K8_HOST_P2
V3700_Canister_Left_Port1
V3700_Canister_Right_Port1
FABRIC B
Zone name= W2K8_HOST_P1_to_V3700_Port2s:
W2K8_HOST_P1
V3700_Canister_Left_Port2
V3700_Canister_Right_Port2
Create a host or host group in the external storage system with the WWPNs for this system.
To complete this step, an IBM DS3400 Host Group is defined for the IBM Storwize V3700,
which contains two hosts. Each host is one of the node canisters of the Storwize V3700.
Creating an IBM DS3400 Host Group
To define a new Host Group for the Storwize V3700 by using the DS3400 Storage Manager,
click the Configure tab and then select Create Host Group to open the Create Host Group
panel. Figure 6-32 shows the IBM DS3400 Configure tab and the Create Host Group option.
Figure 6-32 IBM DS3400 configure tab: Create host group
Important: The configuration of an intra-cluster zone (V3700-to-V3700) on each fabric is
recommended. Place all Storwize V3700 port aliases from each node canister into the one
zone on each of the fabrics. This configuration provides further resilience by providing
another communication path between each of the node canisters.
Important: If you cannot restrict volume access to specific hosts by using the external
storage system, all volumes on the system must be migrated.

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Click Create Host Group and create a host group that is named V3700. Figure 6-33 shows
the IBM DS3400 Create Host Group panel.
Figure 6-33 IBM DS3400 Create Host Group panel
Creating IBM DS3400 hosts
By using the IBM DS3400 Storage Manager, create a Host for each node canister of the
Storwize V3700. To define a new Host by using the DS3400 Storage Manager, click the
Configure tab and then select Configure Host-Access (Manual) to open the configure host
access panel. Figure 6-34 shows the IBM DS3400 configure tab and the Configure
Host-Access (Manual) option.
Figure 6-34 IBM DS3400 storage manager configure tab: Create host

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Enter a name for the host and ensure that the selected host type is IBM TS SAN VCE. The
name of the host should be easily recognizable and meaningful, such as
Storwize_V3700_Canister_Left and Storwize_V3700_Canister_Right. Click Next to
continue. Figure 6-35 shows the IBM DS3400 storage manager configure host access
(manual) panel.
Figure 6-35 IBM DS3400 storage manager configure tab: Configure host

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The node canister’s WWPNs are automatically discovered and must be matched to the
canister’s host definition. Select each of the four WWPNs for the node canister and then click
Add >. The selected WWPN moves to the right side of the panel. Figure 6-36 shows the IBM
DS3400 Specify HBA Host Ports panel.
Figure 6-36 IBM DS3400 specify HBA host ports

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Click Edit to open the Edit HBA Host Port panel, as shown in Figure 6-37.
Figure 6-37 IBM DS3400 storage manager specifying HBA host ports: Edit alias
Figure 6-38 shows the Edit HBA Host Port panel. Enter a meaningful alias for each of the
WWPNs, such as V3700_Canister_Left_P1. See the previously defined SAN fabric aliases in
“Zoning: Define aliases on the SAN fabrics” on page 286 to ensure that everything was added
correctly.
Figure 6-38 IBM DS3400 edit HBA host port panel
After the four ports for the node canister with the meaningful aliases are added to the node
canister host definition, click Next to continue. Figure 6-39 on page 293 shows the node
canister WWPNs that are added to the host definition on the IBM DS3400 Specify HBA Host
Ports panel.

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Figure 6-39 IBM DS3400 specify HBA host ports
Select Yes to allow the host to share access with other hosts for the same logical drives.
Ensure that the existing Host Group is selected and shows the previously defined V3700 host
group. Click Next to continue. Figure 6-40 shows the IBM DS3400 Specify Host Group panel.
Figure 6-40 IBM DS3400 specify host group panel

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A summary panel of the defined host and its associated host group is displayed. Cross-check
and confirm the host definition summary, and then click Finish. Figure 6-41 shows the IBM
DS3400 Confirm Host Definition panel.
Figure 6-41 IBM DS3400 Confirm Host Definition
A host definition must be created for the other node canister. This host definition must also be
associated to the Host Group V3700. To configure the other node canister, complete the
steps that are described in “Creating IBM DS3400 hosts” on page 289.
The node canister Host definitions are logically contained in the V3700 Host Group. After both
node canister hosts are created, confirm the host group configuration by reviewing the IBM
DS3400 host topology tree. To access the host topology tree, use the IBM DS3400 storage
manage and click the Modify tab and select Edit Host Topology. Figure 6-42 shows the IBM
DS3400 Modify tab and the Edit Host Topology option.
Figure 6-42 IBM DS3400 modify tab: Edit host topology

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Figure 6-43 shows the host topology of the defined V3700 Host Group with both of the IBM
Storwize V3700 node canister hosts, as seen through the DS3400 Storage Manager
software.
Figure 6-43 IBM DS3400 host group definition for the IBM Storwize V3700
For more information regarding the configuration of IBM DS3400, see the IBM Storwize
V3700 Information Center for DS3400 configuration recommendations that are found at this
website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Fsvc_configdiskcontrollersovr_22n9uf.html
Now that the environment is prepared, return to the IBM Storwize V3700 GUI step 2 of the
storage migration wizard and click Next to continue to the next stage of the migration wizard,
as shown in Figure 6-44 on page 296.

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Figure 6-44 Step 3 of the storage migration wizard
Create a list of all external storage system volumes that are being migrated. Record the hosts
that use each volume.
Table 6-3 shows a list of the IBM DS3400 logical units that are to be migrated and the host
that uses them.
Table 6-3 List of the IBM DS3400 logical units that are migrated and hosted
Record the WWPNs that are associated with each host.
The WWPNs that are associated to the host can be seen in Table 6-4 on page 297. It is also
recommended to record the HBA firmware, HBA device driver version, adapter information,
operating system, and V3700 multi-path software version, if possible.
LU Name Controller Array SCSI ID Host name Capacity
Migration_1 DS3400 Array 1 0 W2K8_FC 50 GB
Migration_2 DS3400 Array 3 1 W2K8_FC 100 GB

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Table 6-4 WWPNs associated to the host
Unmap all volumes being migrated from the hosts in the storage system and map them to the
host or host group that you created when your environment was prepared.
Change IBM DS3400 LU mappings
The LUs that are being migrated are presented from the IBM DS3400 to the Windows 2008
host because of a mapping definition that was configured on the IBM DS3400. To modify the
mapping definition so that the LUs are accessible only by the V3700 Host Group, a modify
mapping operation must be completed on the IBM DS3400. To modify the mapping on the
IBM DS3400, click the Modify tab and select Edit Host-to-Logical Drive Mappings, as
shown in Figure 6-45.
Figure 6-45 IBM DS3400 storage manager Modify tab
Figure 6-46 shows the IBM DS3400 logical drives mapping information before the change.
Figure 6-46 IBM DS3400 Logical drives mapping information before changes
To modify the mapping definition so that the LUs are accessible only by the V3700 Host
Group, select Change... to open the Change Mapping panel and modify the mapping. This
step ensures that the LU cannot be accessed from the Windows 2008 Host. Figure 6-47
shows the Change... selection in Modify Mapping panel of the DS3400.
Figure 6-47 IBM DS3400 modify mapping panel: change mapping
Host Name Adapter / Slot / Port WWPNs HBA
F/W
HBA
Device
Driver
Operating
System
V3700
Multipath
Software
W2K8_FC QLE2562 / 2 / 1 21000024FF2D0BE8 2.10 9.1.9.25 W2K8 R2 SP1 SDDDSM
2.4.3.1-2
QLE2562 / 2 / 2 21000024FF2D0BE9
Important: If you cannot restrict volume access to specific hosts by using the external
storage system, all volumes on the system must be migrated.

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Select Host Group V3700 in the menu and ensure that the Logical Unit Number (LUN)
remains the same. Record the LUN number for later reference. Figure 6-48 shows the IBM
DS3400 Change Mapping panel.
Figure 6-48 IBM DS3400 change mapping panel
Confirm the mapping change by selecting Yes, as shown in Figure 6-49.
Figure 6-49 Change mapping confirmation panel
Repeat the steps that are described in “Change IBM DS3400 LU mappings” on page 297 for
each of the LUs that are to be migrated. Confirm that the Accessible By column now reflects
the mapping changes. Figure 6-50 on page 299 shows both logical drives are now accessible
by Host Group V3700 only.

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Figure 6-50 iBM DS3400 storage manager Modify panel: edit host-to-logical drive mappings
Record the storage system LUN that is used to map each volume to this system.
The LUNs that are used to map the logical drives remained unchanged and can be found in
Table 6-3 on page 296.
Now that step 3 of the storage migration wizard is complete, click Next to begin the Detect
MDisks task. After the task is complete, click Close to move to the next step of the wizard.
Figure 6-51 shows the Discover Devices task.
Figure 6-51 Discover devices task
The next step of the storage migration wizard is entitled Migrating MDisks, as shown in
Figure 6-52 on page 300. The MDisk name is allocated depending on the order of device
discovery; mdisk2 in this case is LUN 0 and mdisk3 is LUN 1. There is an opportunity to
change the MDisk names to something more meaningful to the user in later steps.

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Figure 6-52 Selecting MDisks for migration
Select the MDisks and click Next to begin the Import MDisks task. After the Import MDisks
running task is complete (as shown in Figure 6-53), select Close to move to the next stage.
Figure 6-53 Import MDisks panel

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The next stage of the storage migration wizard is entitled Configure Hosts, as shown in
Figure 6-54.
Figure 6-54 Storage migration wizard: Create host

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If the Windows 2008 host is not yet defined in the Storwize V3700, select New Host to open
the Create Host panel, as shown in Figure 6-55. Enter a host name and select the WWPNs
that were recorded earlier from the Fibre Channel ports menu. Select Add Port to List for
each WWPN. If the host is already defined, select it and click Next to move on to the next
stage of the migration a shown in Figure 6-58 on page 304.
Figure 6-55 Storwize V3700 create host panel: select WWPNs
Important: It is not mandatory to select the hosts now. The actual selection of the hosts
occurs in the next step.

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After all of the port definitions are added, click Create Host to start the Create Host running
task. Figure 6-56 shows the Create Host panel with both of the required port definitions listed.
Figure 6-56 Create host panel: both port definitions listed

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After the Create Host running task is complete, select Close (as shown in Figure 6-57) to
return to data migration wizard.
Figure 6-57 Create Host running task panel
From the Configure Hosts stage of the data migration wizard, select the host that was
configured and click Next, as shown in Figure 6-54 on page 301.
The next step of the wizard is entitled Map Volumes to Hosts, as shown in Figure 6-58.
Figure 6-58 Storage migration wizard: Map Volumes

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The name that is automatically given to the image mode volume includes the controller and
the LUN information. At this stage, it is possible to rename the volumes to a more appropriate
name. Highlight the volume and right-click or click Actions and select the rename option.
After the new name is entered, click Rename from the Rename Volume panel to start the
rename running task. Rename all volumes to be migrated. Figure 6-59 shows the Rename
Volume panel.
Figure 6-59 Rename volume panel
After the final rename running task is complete, click Close (as shown in Figure 6-60) to
return to the migration wizard.
Figure 6-60 Rename Volume running task

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Highlight the two MDisks and select Map to Host to open the Modify Host Mappings panel.
Figure 6-61 shows the storage migration wizard with the renamed MDisks highlighted for
mapping.
Figure 6-61 Storage migration wizard: Renamed MDisks highlighted for mapping
Select the host from the menu on the Modify Host Mappings panel (as shown in Figure 6-62)
and click Map Volumes. The rest of the Modify Host Mappings panel opens.
Figure 6-62 Modify host mappings panel
The MDisks that were highlighted are shown in yellow in the Modify Host Mappings panel.
The yellow highlighting means that the volumes are not yet mapped to the host. Now is the
time to edit the SCSI ID, if required. (In this case, it is not necessary.) Click Map Volumes to
start the Modify Mappings task and map the volumes to the host. Figure 6-63 on page 307
shows the Modify Host Mappings panel.

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Figure 6-63 Modify host mappings panel
After the Modify Mappings running task is complete, select Close (as shown in Figure 6-64)
to return to the data migration wizard.
Figure 6-64 Modify Mappings running task
Confirm that the MDisks are now mapped by ensuring the Host Mappings column has a Yes
listed for each MDisk, as shown in Figure 6-65 on page 308.

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Figure 6-65 Storage migration wizard: MDisks mapped
Verify migrated disk device type is now 2145 on the host
Now the migrated volumes are mapped to the Storwize V3700 host definition. The host disk
properties should show the disk device type as an IBM 2145 Multi-Path disk device. To
confirm this information is accurate, right-click the disk to open the menu and select
Properties, as shown in Figure 6-66.
Figure 6-66 Display the disk properties from the Windows 2008 disk migration panel
After the disk properties panel is opened, the General tab shows the disk device type.
Figure 6-67 shows the Windows 2008 disk properties General tab.

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Figure 6-67 Windows 2008 properties general tab
The Storwize V3700 SDDDSM can also be used to verify that the migrated disk device is
connected correctly. For more information about running SDDDSM commands, see
Chapter 4, “Host configuration” on page 151 and Chapter 5, “Basic volume configuration” on
page 189. Use the SSDDSM output to verify that the expected number of devices, paths, and
adapters are shown.
From the storage migration wizard, click Next to open the next stage of the wizard entitled
Select Storage Pool, as shown in Figure 6-68. In this section, you can optionally choose an
internal storage pool in which to create the mirror volumes for the data migration task. If you
do not choose a pool, the data migration can be carried out at a later date.
Figure 6-68 Storage migration wizard; select storage pool

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Highlight an internal storage pool and click Next to begin the Start Migration task. After the
Start Migration running task is complete, select Close (as shown in Figure 6-69 on page 310)
to return to the storage migration wizard.
Figure 6-69 Start Migration completed task panel
Click Next (as shown in Figure 6-68 on page 309) to move to the final stage of the data
migration wizard entitled Finish the Storage Migration Wizard and click Finish, as shown in
Figure 6-70.
Figure 6-70 Storage migration wizard

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The end of the storage migration wizard is not the end of the data migration. The System
Migration panel opens, which shows the data migration in progress. A percentage indicator
shows how far it has progressed, as shown in Figure 6-71.
Figure 6-71 System migration panel: Migration progress indicators
When the volume migrations are complete, select the volume migration instance and
right-click Finalize to open the Finalize Volume Migrations panel. Figure 6-72 shows the
System Migration panel with the completed migrations and the Finalize option.
Figure 6-72 System migration panel: Finalization
From the Finalize Volume Migrations panel, verify the volume names and the number of
migrations and click OK, as shown in Figure 6-73.
Figure 6-73 Finalize volume migrations panel

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The image mode volumes are deleted and the associated image mode MDisks are removed
from the migration storage pool. The status of those image mode MDisks is unmanaged.
When the finalization is done, the data migration to the IBM Storwize V3700 is complete.
Remove the DS3400-to-V3700 zoning and retire the older storage system.

© Copyright IBM Corp. 2013. All rights reserved.
313
Chapter 7.
Storage pools
This chapter describes how IBM Storwize V3700 manages physical storage resources. All
storage resources that are under IBM Storwize V3700 control are managed by using
storage
pools
. Storage pools make it easy to dynamically allocate resources, maximize productivity,
and reduce costs.
This chapter includes the following topics:
Configuration
Working with internal drives
Configuring internal storage
Working with MDisks
Working with Storage Pools
7

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7.1 Configuration
Storage pools are configured through the Easy Setup wizard when the system is first
installed, as described in Chapter 2, “Initial configuration” on page 27.
All available drives are configured based on recommended configuration preset values for the
RAID level and drive class. The recommended configuration uses all of the drives to build
arrays that are protected with the appropriate number of spare drives.
The management GUI also provides a set of presets to help you configure for different RAID
types. You can tune storage configurations slightly, based on best practices. The presets vary
according to how the drives are configured. Selections include the drive class, the preset from
the list that is shown, whether to configure spares, whether to optimize for performance or
capacity, and the number of drives to provision.
Default extent size: The IBM Storwize V3700 GUI has a default extent size value of 1GB
when you define a new Storage Pool. This is a change in the IBM Storwize code v7.1 (prior
versions of code used a default extent size of 256MB).
The GUI does not have the option to change the extent size. Therefore, if you want to
create Storage Pools with a different extent size, this must be done via the command-line
interface (CLI) by using the mkmdiskgrp and mkarray commands.

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7.2 Working with internal drives
This section describes how to configure the internal storage disk drives by using different
RAID levels and optimization strategies.
The IBM Storwize V3700 storage system provides an Internal Storage window for managing
all internal drives. The Internal Storage window can be accessed by opening the Overview
window, clicking the Internal Drives function icon, and then clicking Pools, as shown in
Figure 7-1.
Figure 7-1 Internal Storage via Home Overview

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An alternative way to access the Internal Storage window is by clicking the Pools icon on the
left side of the window, as shown in Figure 7-2.
Figure 7-2 Internal Storage Details via Pools icon
7.2.1 Internal storage window
The Internal Storage window (as shown in Figure 7-3) shows an overview of the internal
drives that are installed in the IBM Storwize V3700 storage system. Selecting All Internal in
the Drive Class Filter shows all of the drives that are installed in the managed system,
including attached expansion enclosures. Alternatively, you can filter the drives by their type
or class; for example, you can choose to show only SAS, SATA, or SSD drives.
Figure 7-3 Internal storage window

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On the right side of the Internal Storage window, the internal disk drives of the selected type
are listed. By default, the following information also is listed:
Logical drive ID
Drive’s capacity
Current type of use (unused, candidate, member, spare, or failed)
Status (online, offline, and degraded)
MDisk’s name that the drive is a member of
Enclosure ID that it is installed in
Physical Drive Slot ID of the enclosure that it is installed in
Default sort order is by enclosure ID, but this default can be changed to any other column by
left-clicking the column header. To toggle between ascending and descending sort order,
left-click the column header again.
More details can be shown (for example, the drive’s RPM speed or its MDisk member ID) by
right-clicking the blue header bar of the table, which opens the selection panel, as shown in
Figure 7-4.
Figure 7-4 Internal storage window details selection
In addition, you can find the internal storage capacity allocation indicator in the upper right.
The Total Capacity shows the overall capacity of the internal storage that is installed in this
IBM Storwize V3700 storage system. The MDisk Capacity shows the internal storage
capacity that is assigned to the MDisks. The Spare Capacity shows the internal storage
capacity that is used for hot spare disks.

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The percentage bar that is shown in Figure 7-5 indicates how much capacity is allocated.
Figure 7-5 Internal storage allocation indicator
7.2.2 Actions on internal drives
There are a few actions that can be performed on internal drives when you select the drive
and right-click it or click the Actions drop-down menu, as shown in Figure 7-6.
Figure 7-6 Internal drive actions menu
Fix Error
The Fix Error action starts the Directed Maintenance Procedure (DMP) for a defective drive.
For more information, see Chapter 11, “RAS, monitoring, and troubleshooting” on page 543.
Take Drive Offline
The internal drives can be taken offline when there are problems on the drives. A confirmation
window opens, as shown in Figure 7-7 on page 319.

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Figure 7-7 Take internal drive offline warning
A drive must be taken offline only if a spare drive is available. If the drive fails (as shown in
Figure 7-8), the MDisk of which the failed drive is a member remains online and a hot spare is
automatically reassigned.
Figure 7-8 Internal drive taken offline
If no sufficient spare drives are available and one drive must be taken offline, the second
option for no redundancy must be selected. This option results in a degraded MDisk, as
shown in Figure 7-9.
Figure 7-9 Internal drive that is failed with MDisk degraded

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The IBM Storwize V3700 storage system prevents the drive from being taken offline if there
might be data loss as a result. A drive cannot be taken offline (as shown in Figure 7-10) if no
suitable spare drives are available and, based on the RAID level of the MDisk, drives are
already offline.
Figure 7-10 Internal drive offline not allowed because of insufficient redundancy
Example 7-1 shows how to use the chdrive command to set the drive to failed.
Example 7-1 The use of the chdrive command to set drive to failed
chdrive -use failed driveID
chdrive -use failed -allowdegraded driveID
Mark as...
The internal drives in the IBM Storwize V3700 storage system can be assigned to several
usage roles, which can be unused, candidate, or spare, as shown in Figure 7-11 on
page 321. The roles have the following meanings:
Unused: The drive is not in use and cannot be used as a spare.
Candidate: The drive is available for use in an array.
Spare: The drive can be used as a hot spare, if required.

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Figure 7-11 Internal drive mark as option
The new role that can be assigned depends on the current drive usage role. Figure 7-12
shows these dependencies.
Figure 7-12 Internal drive usage role table
Identify
Use the Identify action to turn on the LED light so that you can easily identify a drive that must
be replaced or that you want to troubleshoot. The panel that is shown in Figure 7-13 on
page 322 appears when the LED is on.

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Figure 7-13 Internal drive identification
Click Turn LED Off when you are finished.
Example 7-2 shows how to use the chenclosureslot command to turn on and off the drive
LED.
Example 7-2 The use of the chenclosureslot command to turn on and off drive LED
chenclosureslot -identify yes/no -slot slot enclosureID
Show Dependent Volumes
Clicking Show Dependent Volumes shows you volumes that are dependent on the selected
drive. Volumes are dependent on a drive only when the underlying disks or MDisks are in a
degraded or inaccessible state and removing further hardware causes the volume to go
offline. This condition is true for any RAID 0 MDisk or if the associated MDisk is degraded
already.
Figure 7-14 shows an example if no dependent volumes are detected for this specific drive.
Figure 7-14 Internal drive no dependent volume
Important: A lack of listed dependent volumes does not imply that there are no volumes
that were created by using this drive.

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Figure 7-15 shows the list of dependent volumes for a drive when its underlying MDisk is in a
degraded state.
Figure 7-15 Internal drive with dependent volume
Example 7-3 shows how to view dependent volumes for a specific drive by using the CLI.
Example 7-3 Command to view dependent vdisks for a specific drive
lsdependentvdisks -drive driveID
Properties
Clicking Properties (as shown in Figure 7-16 on page 324) in the Actions menu or
double-clicking the drive provides the VPD and the configuration information. The Show
Details option was selected to show more details.

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Figure 7-16 Internal drives properties part1
If the Show Details option is not selected, the technical information section is reduced, as
shown in Figure 7-17.
Figure 7-17 Internal drives properties no details
A tab for the Drive Slot is available in the Properties panel (as shown in Figure 7-18) to show
specific information about the slot of the selected drive.

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Figure 7-18 Internal drive properties slot
Example 7-4 shows how to use the lsdrive command to display configuration information
and drive VPD.
Example 7-4 The use of the lsdrive command to display configuration information and drive VPD
lsdrive driveID

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7.3 Configuring internal storage
The complete internal storage of an IBM Storwize V3700 can be configured into MDisks and
pools by using the system setup wizard during the initial configuration. For more information,
see Chapter 2, “Initial configuration” on page 27.
The decision that is shown in Figure 7-19 must be made when configuring a IBM Storwize
V3700.
Figure 7-19 Decision to customize storage configuration
The decision choices include the following considerations:
Use initial configuration
During system setup, all available drives can be configured based on the RAID
configuration presets. The initial setup creates MDisks and pools but does not create
volumes.
If this automated configuration fits your business requirement, it is recommended that this
configuration is used.
Customize storage configuration
A storage configuration might be customized for the following reasons:
– The automated initial configuration does not meet customer requirements.
– More storage was attached to the IBM Storwize V3700 and must be integrated into the
existing configuration.
7.3.1 RAID configuration presets
RAID configuration presets are used to configure internal drives that are based on
recommended values for the RAID level and drive class. Each preset has a specific goal for
the number of drives per array and the number of spare drives to maintain redundancy.
Table 7-1 on page 327 describes the presets that are used for solid-state drives (SSDs) for
the IBM Storwize V3700 storage system.

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Table 7-1 SSD RAID presets
Table 7-2 describes the RAID presets that are used for hard disk drives (HDDs) for the IBM
Storwize V3700 storage system.
Table 7-2 HDD RAID presets
Preset Purpose RAID
level
Drives per
array goal
Drive count
(Min - Max)
Spare drive
goal
SSD RAID 5 Protects against a single drive failure.
Data and one stripe of parity are
striped across all array members.
5 8 3 - 16 1
SSD RAID 6 Protects against two drive failures.
Data and two stripes of parity are
striped across all array members.
6 12 5 - 16 1
SSD RAID 10 Protects against at least one drive
failure. All data is mirrored on two array
members.
10 8 2 - 16 (even) 1
SSD RAID 1 Protects against at least one drive
failure. All data is mirrored on two array
members.
1 2 2 1
SSD RAID 0 Provides no protection against drive
failures.
0 8 1 - 8 0
SSD Easy Tier Mirrors data to protect against drive
failure. The mirrored pairs are spread
between storage pools to be used for
the Easy Tier function.
10 2 2 - 16 (even) 1
Preset Purpose RAID
level
Drives
per array
goal
Drive count
(Min - Max)
Spare
goal
Basic
RAID 5
Protects against a single drive
failure. Data and one stripe of
parity are striped across all array
members.
5 8 3 - 16 1
Basic
RAID 6
Protects against two drive
failures. Data and two stripes of
parity are striped across all array
members.
6 12 5 - 16 1
Basic
RAID 10
Protects against at least one
drive failure. All data is mirrored
on two array members.
10 8 2 - 16
(evens)
1
Balanced
RAID 10
Protects against at least one
drive or enclosure failure. All
data is mirrored on two array
members. The mirrors are
balanced across the two
enclosure chains.
10 8 2 - 16
(evens)
1
RAID 0 Provides no protection against
drive failures.
0 8 1 - 8 0

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7.3.2 Customize initial storage configuration
If the initial storage configuration does not meet the requirements, pools must be deleted.
Select the Pool navigator in the GUI and click Pools  MDisks by Pools. Select the pool,
right-click the pool, and select Delete Pool, as shown in Figure 7-20.
Figure 7-20 Delete selected pool
The option for deleting the Volumes, Mappings and MDisks must be selected so that all
associated drives are marked as a candidate for deletion, as shown in Figure 7-21.
Figure 7-21 Delete pool confirmation
These drives now can be used for a different configuration.
Important: When a pool is deleted, data that is contained within any volume that is
provisioned from this pool is deleted.

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7.3.3 Create new MDisk and pool
To configure internal storage, click Pools  Internal Storage and click Configure Storage,
as shown in Figure 7-22.
Figure 7-22 Click Configure Storage’
A configuration wizard opens and guides you through the process of configuring internal
storage. The wizard shows all internal drives, their status, and their use. The status shows
whether it is Online, Offline or Degraded. The Use will show if a drive is Unused, a Candidate
for configuration, a Spare, a Member of a current configuration, or Failed. Figure 7-23 shows
an example in which 67 drives are available for configuration.
Figure 7-23 Available drives for new MDisk

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If there are internal drives with a status of unused, a window opens, which gives the option to
include them in the RAID configuration, as shown in Figure 7-24.
Figure 7-24 Unused drives warning
When the decision is made to include the drives into the RAID configuration, their status is set
to Candidate, which also makes them available for a new MDisk.
The use of the storage configuration wizard simplifies the initial disk drive setup and offers the
following options:
Use the recommended configuration
Select a different configuration
Selecting Use the recommended configuration guides you through the wizard that is
described in “Using the recommended configuration” on page 330. Selecting Select a
different configuration uses the wizard that is described in “Selecting a different configuration”
on page 333.
7.3.4 Using the recommended configuration
As shown in Figure 7-25, when you click Use the recommended configuration, the wizard
offers a recommended storage configuration at the bottom of the window.
Figure 7-25 The recommended configuration

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The following recommended RAID presets for different drive classes are available:
SSD EasyTier or RAID 1 for SSDs
Basic RAID 5 for SAS drives and SSD drives
Basic RAID 6 for Nearline SAS drives
Figure 7-25 on page 330 shows a sample configuration with 1x SSD and 14x SAS drives. The
Configuration Summary shows a warning that there are insufficient SSDs installed to satisfy
the RAID 1 SSD preset, as two drives are required to do this, plus a third drive for a hot spare.
By using the recommended configuration, spare drives also are automatically created to meet
the spare goals according to the preset that is chosen. One spare drive is created out of every
24 disk drives of the same drive class. Spares are not created if sufficient spares are already
configured.
Spare drives in the IBM Storwize V3700 are
global spares
, which means that any spare drive
that has at least the same capacity as the drive to be replaced can be used in any array. Thus,
an SSD array with no SSD spare available uses an HDD spare instead.
If the proposed configuration meets your requirements, click Finish, and the system
automatically creates the array MDisks with a size according to the chosen RAID level.
Storage pools also are automatically created to contain the MDisks with similar performance
characteristics, including the consideration of RAID level, number of member drives, and drive
class.
After an array is created, the Array MDisk members are synchronized with each other through
a background initialization process. The progress of the initialization process can be
monitored by clicking the icon at the left of the Running Tasks status bar and selecting the
initialization task to view the status, as shown in Figure 7-26 on page 332.
Important: This option adds new MDisks to an existing storage pool when the
characteristics match. If this is not what is required, the Select different configuration option
should be used.

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Figure 7-26 Running task panel
Click the taskbar to open the progress window, as shown in Figure 7-27. The array is
available for I/O during this process. The initialization does not affect the availability because
of possible member drive failures.
Figure 7-27 Initialization progress view

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7.3.5 Selecting a different configuration
The option Select a different configuration offers a more flexible way to configure the internal
storage as compared to the Use the recommended configuration preset in terms of drive
selection, RAID level, and storage pool to be used.
Only one drive class (RAID configuration) can be allocated at a time.
Complete the following steps to select a different configuration:
1.Choose drive class and RAID preset.
The drive class selection list contains each drive class that is available for configuration, as
shown in Figure 7-28.
Figure 7-28 Select drive class for new configuration
2.Click Next and Select the appropriated RAID preset, as shown in Figure 7-29 on
page 334.

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Figure 7-29 Select the RAID preset
3.Define the RAID attributes.
You can slightly tune RAID configurations based on best practices. Selections include the
configuration of spares, optimization for performance, optimization for capacity, and the
number of drives to provision.
Each IBM Storwize V3700 preset has a specific goal for the number of drives per array.
For more information, see the Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp
Table 7-3 shows the RAID goal widths.
Table 7-3 RAID goal width
Optimizing for Performance creates arrays with same capacity and performance
characteristics. The RAID goal width (as shown in Table 7-3) must be met for this target. In
a performance optimized setup, the IBM Storwize V3700 provisions eight physical disk
drives in a single array MDisk, except for the following situations:
– RAID 6 uses 12 disk drives.
– SSD Easy Tier uses two disk drives.
Therefore, creating an Optimized for Performance configuration is only possible if there is
a sufficient number of drives available to match your needs.
RAID level HDD goal width SSD goal width
0 8 8
5 8 9
6 12 10
10 8 8

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As a consequence, all arrays with similar physical disks feature the same performance
characteristics. Because of the defined presets, this setup might leave drives unused. The
remaining unconfigured drives can be used in another array.
Figure 7-30 shows an example in which not all of the provisioned drives can be used in a
performance optimized configuration. Six drives remain.
Figure 7-30 Optimization for performance failed
Figure 7-31 shows that the number of drives is not enough to satisfy the needs of the
configuration.
Figure 7-31 Less drive for performance optimization
Figure 7-32 shows that there are a suitable number of drives to configure performance
optimized arrays.

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Figure 7-32 Arrays match performance goals
Four RAID 5 were built and all provisioned drives are used.
Optimizing for capacity creates arrays that allocate all the drives specified in the Number
of drives to provision field. This option results in arrays of different capacities and
performance. The number of drives in each MDisk does not vary by more than one drive,
as shown in Figure 7-33.
Figure 7-33 Capacity optimized configuration

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4.Storage pool assignment.
Choose whether an existing pool must be expanded or whether a new pool is created for
the configuration, as shown in Figure 7-34.
Figure 7-34 Storage pool selection
Complete the following steps to expand or create a pool:
a.Expand an existing pool.
When an existing pool is to be expanded, you can select an existing storage pool that
does not contain MDisks or a pool that contains MDisks with the same performance
characteristics, which are listed automatically as shown in Figure 7-35.
Figure 7-35 List of matching storage pool

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b.Create a pool.
Alternatively, a storage pool is created by enter the required name, as shown in
Figure 7-36.
Figure 7-36 Create new pool
All drives are initialized when the configuration wizard is finished.
7.4 Working with MDisks
After the configuration is complete for the internal storage, you can find the MDisks that were
created on the internal arrays in the MDisks by Pools window.
You can access the MDisks window by clicking Home  Overview and then clicking the
MDisks function icon. In the extended help information window, click Pools, as shown in
Figure 7-37 on page 339.

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Figure 7-37 MDisk from Overview window
An alternative way to access the MDisks window is by using the Pools function icon and
selecting MDisks by Pools, as shown in Figure 7-38.
Figure 7-38 MDisk from Physical Storage icon

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7.4.1 MDisk by Pools panel
The MDisks by Pools panel (as shown in Figure 7-39) displays information about each of the
Pools and their associated MDisks.
Figure 7-39 MDisk by Pool window
The following default information is provided:
Name
The MDisk or the Storage Pool name that is provided during the configuration process.
ID
The MDisk or Storage Pool ID that is automatically assigned during the configuration
process.
Status
The status of the MDisk and Storage Pool. The following statuses are possible:
– Online
All MDisks are online and performing optimally.
– Degraded
One MDisk is in degraded state (for example, missing SAS connection to enclosure of
member drives or a failed drive with no spare available). As shown in Figure 7-40, the
pool also is degraded.
Figure 7-40 One degraded MDisk in pool

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– Offline
One or more MDisks in a pool are offline. The pool (Pool3) also changes to offline, as
shown in Figure 7-41.
Figure 7-41 Offline MDisk in a pool
Capacity
The capacity of the MDisk. For the Storage Pool, the capacity is shown, which is the total
of all the MDisks in this pool. The usage of the Storage Pool is represented by a bar and
the number.
Mode
The mode of the MDisk. The following modes are available in the IBM Storwize V3700:
– Array
The MDisk represents a set of drives from internal storage that is managed together by
using RAID.
– Image/unmanaged
This status is an intermediate status of the migration process and is described in
Chapter 6, “Storage migration wizard” on page 261.
Storage Pool
The name of the Storage Pool to which the MDisk belongs.
The CLI command lsmdiskgrp (as shown in Example 7-5) returns a concise list or a detailed
view of the storage pools that are visible to the system.
Example 7-5 CLI command lsmdiskgrp
lsmdiskgrp
lsmdiskgrp mdiskgrpID
7.4.2 RAID action for MDisks
Internal drives in the IBM Storwize V3700 are managed as Array mode MDisks, on which
several RAID actions can be performed. Select the appropriate Array MDisk by clicking
Pools  MDisks by Pools, and then click Actions  RAID Actions, as shown in
Figure 7-42 on page 342.

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Figure 7-42 MDisk RAID actions
You can choose the following RAID actions:
Set Spare Goal
Figure 7-43 shows how to set the number of spare drives that are required to protect the
array from drive failures.
Figure 7-43 MDisk set spare goal
The alternative CLI command is shown in Example 7-6.
Example 7-6 CLI command to set spares
charray -sparegoal mdiskID goal
If the number of drives that are assigned as Spare does not meet the configured spare
goal, an error is logged in the event log that reads: “Array MDisk is not protected by
sufficient spares”. This error can be fixed by adding drives as spare. During the internal
drive configuration, spare drives are automatically assigned according to the chosen RAID
preset’s spare goals, as described in 7.3, “Configuring internal storage” on page 326.
Swap Drive
The Swap Drive action can be used to replace a drive in the array with another drive with
the status of Candidate or Spare. This action is used to replace a drive that failed, or is
expected to fail soon; for example, as indicated by an error message in the event log.

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Select an MDisk that contains the drive to be replaced and click RAID Actions  Swap
Drive. In the Swap Drive window, select the member drive that is replaced (as shown in
Figure 7-44) and click Next.
Figure 7-44 MDisk swap drive: Step 1
In step 2 (as shown as Figure 7-45), a list of suitable drives is presented. One drive must
be selected to swap into the MDisk. Click Finish.
Figure 7-45 MDisk swap drive pool step 2

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The exchange process starts and runs in the background, and the volumes on the affected
MDisk remain accessible.
If for any reason the GUI process is not used, the CLI command in Example 7-7 can be
run.
Example 7-7 CLI command to swap drives
charraymember -balanced -member oldDriveID -newdrive newDriveID mdiskID
Delete
An Array MDisk can be deleted by clicking RAID Actions  Delete. To select more than
one MDisk, use Ctrl+left-mouse click. A confirmation is required (as shown in Figure 7-46)
by entering the correct number of MDisks to be deleted. You must confirm the number of
MDisks that you want to delete. If there is data on the MDisk, it can be deleted only by
tagging the option Delete the RAID array MDisk even if it has data on it. The system
migrates the data to other MDisks in the pool.
Figure 7-46 MDisk delete confirmation
Data that is on MDisks is migrated to other MDisks in the pool, assuming enough space is
available on the remaining MDisks in the pool.
After an MDisk is deleted from a pool, its former member drives return to candidate mode.
The alternative CLI command to delete MDisks is shown in Example 7-8.
Example 7-8 CLI command to delete MDisk
rmmdisk -mdisk list -force mdiskgrpID
If all the MDisks of a storage pool were deleted, the pool remains as an empty pool with
0 bytes of capacity, as shown in Figure 7-47.
Available capacity: Make sure that you have enough available capacity that is left in
the storage pool for the data on the MDisks to be removed.

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Figure 7-47 Empty storage pool after MDisk deletion
7.4.3 Other actions on MDisks
Some of the other actions are available by clicking MDisk by Pool  Actions, as shown in
Figure 7-48.
Figure 7-48 MDisk actions
Rename
MDisks can be renamed by selecting the MDisk and clicking Rename from the Actions menu.
Enter the new name of your MDisk (as shown in Figure 7-49) and click Rename.
Figure 7-49 Rename MDisk
Show Dependent Volumes
Figure 7-50 on page 346 shows the volumes dependent on an MDisk and can be displayed
by selecting the MDisk and clicking Show Dependent Volumes from the Actions menu. The
volumes are listed with general information.

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Figure 7-50 Show dependent Volumes
Properties
The Properties action for an MDisk shows the information that you need to identify it. In the
MDisks by Pools window, select the MDisk and click Properties from the Actions menu. The
following tabs are available in this window:
The Overview tab (as shown in Figure ) contains information about the MDisk. To show
more details, click Show Details.
Figure 7-51 MDisk properties overview

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The Dependent Volumes tab (as shown in Figure 7-52) lists all of volumes that use extents
on this MDisk.
Figure 7-52 MDisk dependent volumes
In the Member Drives tab (as shown in Figure 7-53), you find all of the member drives of
this MDisk. Also, all actions that are described in 7.2.2, “Actions on internal drives” on
page 318 can be performed on the drives that are listed here.
Figure 7-53 MDisk properties member

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7.5 Working with Storage Pools
Storage pools act as a container for MDisks and provision the capacity to volumes. IBM
Storwize V3700 organizes storage in Storage Pools to ease storage management and make
it more efficient. Storage pools and MDisks are managed via the MDisks by Pools window.
You can access the MDisks by Pools window by clicking Home  Overview and then clicking
the Pools icon. Extended help information for storage pools is displayed. If you click Visit
Pools, the MDisks by Pools window opens, as shown in Figure 7-54.
Figure 7-54 Pools from the overview window

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An alternative path to the Pools window is to click Pools  MDisks by Pools, as shown in
Figure 7-55.
Figure 7-55 Pools from MDisk by pool window
The MDisk by Pools window (as shown in Figure 7-56) allows you to manage storage pools.
All existing storage pools are displayed by row. The first row contains the item Not in a Pool, if
any exist. Each defined storage pool is displayed with its assigned icon and name, numerical
ID, status, and a graphical indicator that shows that the ratio the pool’s capacity is allocated to
volumes.
Figure 7-56 Pool window
When you expand a pool’s entry by clicking the plus sign (+) to the left of the pool’s icon, you
can access the MDisks that are associated with this pool. You can perform all actions on
them, as described in 7.4, “Working with MDisks” on page 338.

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7.5.1 Create Pool
New storage pools are built when an MDisk is created, if this MDisk is not attached to an
existing pool. To create an empty pool, click the New Pool option in the pool window.
The only required parameter for the pool is the pool name, as shown in Figure 7-57.
Figure 7-57 Create Pool name
The new pool is listed in the pool list with 0 bytes, as shown in Figure 7-58.
Figure 7-58 Empty pool that is created
7.5.2 Actions on storage pools
A few actions can be performed on storage pools by using the Actions menu, as shown in
Figure 7-59. A pool can be renamed, its icon can be changed, and it can be deleted.
Figure 7-59 Pool action overview

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Change storage pool icon
There are different storage pool icons that are available, as shown in Figure 7-60. These
icons can be used to differentiate between different storage tiers or types of drives.
Figure 7-60 Change storage pool icon
Rename storage pool
The storage pool can be renamed at any time, as shown in Figure 7-61.
Figure 7-61 Rename Storage Pool

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Deleting a storage pool
Pools can be deleted only if there are no MDisks or volumes assigned to it. A confirmation
panel (as shown in Figure 7-62) is shown to confirm that all associated MDisk and volumes
can be deleted with the pool.
Figure 7-62 Confirmation to delete the storage pool
If it is safe to delete the pool, the option must be selected.
After you delete the pool, all the associated volumes and their host mappings are removed.
All the array mode MDisks in the pool are removed and all the member drives return to
candidate status.
Important: After you delete the pool, all data that is stored in the pool is lost except for the
image mode MDisks; their volume definition is deleted, but the data on the imported MDisk
remains untouched.

© Copyright IBM Corp. 2013. All rights reserved.
353
Chapter 8.
Advanced host and volume
administration
The IBM Storwize V3700 offers many functions for volume and host configuration. In
Chapter 4, “Host configuration” on page 151 and Chapter 5, “Basic volume configuration” on
page 189, the basic host and volume features of IBM Storwize V3700 are described. Those
chapters also describe how to create hosts and volumes and how to map them to a host.
This chapter contains the following topics:
Advanced host administration
Adding and deleting host ports
Host mappings overview
Advanced volume administration
Volume properties
Advanced volume copy functions
Volumes by Storage Pool
Volumes by Host feature
8

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8.1 Advanced host administration
This section describes host administration, including such topics as host modification, host
mappings, and deleting hosts. Basic host creation and mapping are described in Chapter 4,
“Host configuration” on page 151. It is assumed that you created some hosts and that some
volumes are mapped to them.
Figure 8-1 shows the IBM Storwize V3700 GUI for hosts menu.
Figure 8-1 Host menu

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If you click Hosts, the Hosts window opens, as shown in Figure 8-2.
Figure 8-2 Hosts window
As you can see in Figure 8-2, a few hosts are created and there are volumes mapped to all of
them. These hosts are used to show all the possible modifications.
If you highlight a host, you can click Action (as shown in Figure 8-3 on page 356) or
right-click the host to see all of the available tasks.
Important: Fibre Channel over Ethernet hosts are listed as FC Hosts.

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Figure 8-3 Host menu options
As figure Figure 8-3 shows, there are a number of tasks that are related to host mapping. For
more information, see sections 8.1.1, “Modifying Mappings menu” and 8.1.2, “Unmapping
volumes from a host” on page 360.
8.1.1 Modifying Mappings menu
From the host window, highlight a host and select Modify Mappings (as shown in
Figure 8-3). The Modify Host Mappings window opens, as shown in Figure 8-4 on page 357.

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Figure 8-4 Host mappings window
At the upper left, there is a drop-down menu that shows the host you selected. By selecting
the host from this menu, IBM Storwize V3700 lists the volumes that are ready to be mapped
to the chosen host. The left panel shows the volumes that are already mapped to this host.
In our example, a single volume with SCSI ID 0 is mapped to the host Host_02, and nine
more volumes are available.
Important: The unmapped volumes panel refers to volumes that are not mapped to the
chosen host.

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Figure 8-5 Modify Host Mappings
To map a volume, highlight the volume in the left pane (as shown in Figure 8-5), and select
the upper arrow (pointing to the right) to move the volume from pane to pane. The changes
are marked in yellow and now the Map Volumes and Apply buttons are enabled, as shown in
Figure 8-6.
Figure 8-6 Modify Host Mappings

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If you click Map Volumes, the changes are applied (as shown in Figure 8-7) and the Modify
Mappings window shows the task completed successfully.
Figure 8-7 Modify Mappings: The task completed
After you click Close, the Modify Host Window closes. If you clicked Apply, the changes are
submitted to the system, but the Modify Host window remains open for further changes.
You can now choose to modify another host by selecting it from the Hosts drop-down menu or
continue working with the host that is already selected. As shown in Figure 8-8, we switched
to a different host.
Figure 8-8 Selecting another host to modify

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Highlight the volume that you want to modify again and click the right arrow button to move it
to the right pane. If you right-click in the yellow unmapped volume, you can change the SCSI
ID, which is used for the host mapping, as shown in Figure 8-9.
Figure 8-9 Editing iSCSI ID
Click Edit SCSI ID and then click OK to change the SCSI ID. Click Apply to submit the
changes and complete the host volume mapping.
If you want to remove a host mapping, the required steps are the same. For more information
about Unmapping Volumes, see 8.1.2, “Unmapping volumes from a host”.
8.1.2 Unmapping volumes from a host
If you want to remove host access to certain volumes on your IBM Storwize V3700, you select
the volumes by pressing and holding the Ctrl key and highlighting the volumes, as shown in
Figure 8-10 on page 361.
Important: IBM Storwize V3700 automatically assigns the lowest available SCSI ID if none
is specified. However, you can set a SCSI ID for the volume. The SCSI ID cannot be
changed while volume is assigned to host.

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Figure 8-10 Unmapping certain volumes
If you want to remove access to all volumes in your IBM Storwize V3700 from a host, you can
do it by highlighting the host from Hosts window and clicking Unmap all Volumes from the
Actions menu, as shown in Figure 8-11.
Figure 8-11 Unmap all volumes

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You are prompted to confirm the number of mappings you want to remove. Enter the number
of mappings and click Unmap. In our example, we remove two mappings. Figure 8-12 shows
the unmap from host Host_01.
Figure 8-12 Enter the number of mappings to be removed
The changes are applied to the system, as shown in Figure 8-13. Click Close after you review
the output.
Figure 8-13 Unmapping all volumes from host
Unmapping: By clicking Unmap, all access for this host to volumes that are controlled by
IBM Storwize V3700 system is removed. Ensure that you run the required procedures in
your host operating system before the unmapping procedure.

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Figure 8-14 shows that the host Host_01 no longer has any volume mappings.
Figure 8-14 Host mapping
8.1.3 Duplicate Mappings option
To duplicate host mappings in the IBM Storwize V3700, highlight the host you want to use as
a source and click Duplicate Mappings, as shown in Figure 8-15.
Figure 8-15 Duplicate Mappings

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You are prompted to select the target host that you want to duplicate the volume mappings on
to as shown in Figure 8-16.
Figure 8-16 Target host to duplicate the mappings
Click Duplicate and then Close to return to Hosts window.
8.1.4 Renaming a host
To rename a host object in the IBM Storwize V3700, highlight the host from the Hosts window
and click Rename, as shown in Figure 8-17.
Figure 8-17 Renaming a host
Important: Always check the Operating System capabilities and requirements before
duplicating volume mappings.

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Enter a new name and click Rename, as shown in Figure 8-18. If you click Reset, your
changes are not saved and the host retains its original name.
Figure 8-18 Renaming a host window
After the changes are applied to the system, click Close from the task window, as shown in
Figure 8-19.
Figure 8-19 Rename a host task completed

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8.1.5 Deleting a host
To delete a host, browse to the Hosts window, highlight the host and click Delete, as shown in
Figure 8-20.
Figure 8-20 Deleting a host
You are prompted to confirm the number of hosts you want to delete then click Delete, as
shown in Figure 8-21.
Figure 8-21 Deleting a host
If you want to delete a host with volumes assigned, you must force the deletion by selecting
the option in the lower part of the window, as shown in Figure 8-21. If you select this option,
the host is completely removed from the IBM Storwize V3700.
After the task is complete, click Close (as shown in Figure 8-22 on page 367) to return to the
mappings window.

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Figure 8-22 Delete host task completed
8.1.6 Host properties
This section covers the host properties. Relevant host information can be found through the
next steps. The Host Properties window gives you an overview of your host from the following
tabs:
Overview
Mapped Volumes
Port Definitions
To open the Host Properties window, highlight the host and from the Action drop-down menu,
click Properties. You also can highlight the host and right-click it, as shown in Figure 8-23.
Figure 8-23 Opening host properties

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In the following example, we selected the host Host_01 to show the host properties
information.
When the Overview tab opens, select Show Details in left bottom of the window to see more
information about the host, as shown in Figure 8-24.
Figure 8-24 Host detail information
This tab provides the following information:
Host Name: Host object name.
Host ID: Host object identification number.
Status: The current host object status; it can be Online, Offline or Degraded.
# of FC: Shows the number of host Fibre Channel or FCoE ports that IBM Storwize V3700
can see.
# of iSCSI Ports: Shows the number of host iSCSI name or host IQN ID.
# of SAS Ports: Shows the number of host SAS ports that are connected to IBM Storwize
V3700.
iSCSI CHAP Secret: Shows the Challenge Handshake Authentication Protocol (CHAP)
information if it exists or is configured.

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To change the host properties, click Edit and several fields can be edited, as shown in
Figure 8-25.
Figure 8-25 Host properties: Editing host information
The following changes can be made:
Host Name: Change the host name.
Host Type: Change this setting if you are intending to change host type to HP/UX,
OpenVMS, or TPGS hosts.
iSCSI CHAP Secret: Enter or change the iSCSI CHAP secret for this host.
Make any changes necessary and click Save to apply them. Click Close to return to the Host
Properties window.
The Mapped Volume tab (as shown in Figure 8-26 on page 370) gives you an overview of
which volumes are mapped to this host. The details shown are SCSI ID, volume name, UID
(volume ID) and the Caching I/O Group ID per volume.
Selecting the Show Details option does not show any detailed information.
Important: Only a single I/O Group is allowed in IBM Storwize V3700 cluster.

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Figure 8-26 Host Details: mapped volumes information
The Port Definitions tab (as shown in Figure 8-27) shows the configured host ports and
provides status information about them. It also shows the WWPN numbers (for SAS and FC
hosts) and the IQN (iSCSI Qualified Name) for iSCSI hosts. The Type column shows the port
type information and the # Nodes Logged In column lists the number of IBM Storwize V3700
node canisters that each port (initiator port) has logged on to.
Figure 8-27 Host port details

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By using this window, you can also Add and Delete Host Port (or ports), as described in 8.2,
“Adding and deleting host ports”. The Show Details option does not show any other
information.
Click Close to close the Host Properties section.
8.2 Adding and deleting host ports
To configure host ports, use the IBM Storwize V3700 GUI by clicking Host  Ports by Host
window, as shown in Figure 8-28.
Figure 8-28 Ports by Host
Hosts are listed in the left pane of the window, as shown in Figure 8-29 on page 372. The
function icons show an orange cable for Fibre Channel and FCoE hosts, black for SAS hosts,
and a blue cable for iSCSI hosts.
The properties of the highlighted host are shown in the right pane. If you click New Host, the
wizard that is described in Chapter 4, “Host configuration” on page 151 starts.
If you click the Action drop-down menu (as shown in Figure 8-29 on page 372), the tasks that
are described in the previous sections can be started from this location.

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Figure 8-29 Host action menu
8.2.1 Adding a host port
To add a host port, highlight the host from left side panel, click Add, and choose a Fibre
Channel, SAS, or an iSCSI port, as shown in Figure 8-30.
Figure 8-30 Adding a host port
Important: A host system can have a mix of Fibre Channel, iSCSI, and SAS connections.
If you must mix protocols, check your Operating System capabilities and plan carefully to
avoid miscommunication or data loss.

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8.2.2 Adding a Fibre Channel port
As shown in Figure 8-30 on page 372, click Fibre Channel Port and the Add Fibre Channel
Ports window opens.
If you click the Fibre Channel Ports drop-down menu, you see a list of all known Fibre
Channel host ports that are available. If the worldwide port name (WWPN) of your host is not
available in the menu, check your SAN zoning and rescan the SAN from the host. You can
also try to rescan by clicking Rescan.
Select the WWPN to add and click Add Port to List. Figure 8-31 shows the new port added
to the list.
It is possible to repeat this step to add more ports to a host. If you want to add an offline port,
manually enter the WWPN of the port into the Fibre Channel Ports field and click Add Port to
List, as shown in Figure 8-31.
Figure 8-31 Adding offline port
The port appears as unverified because it is not logged on to the IBM Storwize V3700. The
first time the port logs on, the state changes to online automatically and the mapping is
applied to this port.
To remove one of the ports from the list, click the red X next to it. In Figure 8-31, we manually
added an FC port.
Click Add Ports to Host and the changes are applied. Figure 8-32 on page 374 shows the
output after ports are added to the host. Even if it is an offline port, the IBM Storwize V3700
still add it.
Important: If you are removing either online/offline ports, IBM Storwize V3700 prompts
you to add the number of ports you want to delete but does not warn you about mappings.
Disk mapping is associated to the host object and LUN access is obviously lost if all ports
are deleted.

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Figure 8-32 Adding a host port
8.2.3 Adding a SAS host port
As shown in Figure 8-30 on page 372, from the IBM Storwize V3700 GUI, click Host  Port
by Host and then Add  SAS Port to add a SAS host port to an existing host.
The Add SAS Host Port window opens. If you click the SAS Ports drop-down menu, you see
a list of all known SAS Ports that are connected to IBM Storwize V3700. If SAS WWPNs are
unavailable, click Rescan or check the physical connection (or connections).
Select the SAS WWPN you want to add to the existing host and click Add Port to List, as
shown in Figure 8-33.
Figure 8-33 Adding an online SAS port
The Add Port to Host task completes successfully, as shown in Figure 8-32 on page 374.
Important: IBM Storwize V3700 allows the addition of an offline SAS port. Enter the SAS
WWPN in the SAS Port field and then click Add Port to List.

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8.2.4 Adding an iSCSI host port
To add an iSCSI host port, click iSCSI Port (as shown in Figure 8-30 on page 372) and the
Add iSCSI Ports window opens, as shown in Figure 8-34.
Figure 8-34 Adding iSCSI Host Port
Enter the initiator name of your host and click Add Port to List. After you add the iSCSI Port,
click Add Ports to Host to complete the tasks and apply the changes to the system. The
iSCSI port status remains as unknown until it is added to the host and a host rescan process
is completed. Figure 8-35 shows the output after an iSCSI port is added.
Figure 8-35 Successful iSCSI port addition
Click Close to return to the Ports by Host window.
Important: An error message with code CMMVC6581E is shown if one of the following
conditions occurs:
The IQNs exceed the maximum number allowed.
There is a duplicated IQN.
The IQN contains a comma or leading or trailing spaces or is not valid in some other
way.

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8.2.5 Deleting a host port
To delete host ports, click Host  Ports by Host to open the Ports by Host window, as shown
in Figure 8-30 on page 372.
Select the host in left pane, highlight the host port you want to delete and the Delete Port
button is enabled, as shown in Figure 8-36.
Figure 8-36 Delete host port
If you press and hold the Ctrl key, you can also select several host ports to delete.
Click Delete and you are prompted to enter the number of host ports that you want to delete,
as shown in Figure 8-37.
Figure 8-37 Deleting host port.
Click Delete to apply the changes to the system. A task window appears that shows the
results. Click Close to return to the Ports by Host window.

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8.3 Host mappings overview
From IBM Storwize V3700 GUI, select Host  Host Mappings to open the Host Mappings
overview window, as shown in Figure 8-38.
Figure 8-38 Host volume mappings
This window shows a list of all the hosts and volumes and the respective SCSI ID and Volume
Unique Identifier (UID). In our example in Figure 8-38, the host vmware-fc has two mapped
volumes (volumes vmware-fc and vmware-fc1), and the associated SCSI ID (0 and 1),
Volume Name, Volume Unique Identifier (UID), and Caching I/O Group ID.
If you highlight one line and click Actions (as shown in Figure 8-39), the following options are
available:
Unmap Volumes
Properties (Host) option
Properties (Volume) option
Figure 8-39 Host mapping options

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If multiple lines are highlighted (which are selected by pressing and holding the Ctrl key), only
the Unmap Volumes option becomes available.
8.3.1 Unmap Volumes
Highlight one or more lines and click Unmap Volumes, enter the number of volumes to
remove (as shown in Figure 8-40), and click Unmap. The mappings for all selected entries
are removed.
Figure 8-40 Unmapping a volume from host
A task window should appear showing the status and completion of volume unmapping.
Figure 8-41 shows volume windows2k8-sas being unmapped from host windows2k8-sas.
Figure 8-41 Unmapping a volume from host
Warning: Always ensure that you run the required procedures in your host operating
system before you unmap volumes in the IBM Storwize V3700 GUI.

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8.3.2 Properties (Host) option
Selecting an entry and clicking Properties (Host) (as shown in Figure 8-39 on page 377)
opens the Host Properties window. For more information about this window, see 8.1.6, “Host
properties” on page 367.
8.3.3 Properties (Volume) option
Selecting an entry and clicking Properties (Volume) (as shown in Figure 8-39 on page 377)
opens the Volume Properties view. For more information about volume properties, see 8.5,
“Volume properties” on page 391.
8.4 Advanced volume administration
This section describes volume administration tasks, such as volume modification, volume
migration, and creation of volume copies. We assume that you created volumes on your IBM
Storwize V3700 and you are familiar with generic, thin-provision, mirror, and thin-mirror
volumes.
For more information about basic volume configuration, see Chapter 5, “Basic volume
configuration” on page 189.
Figure 8-42 shows the following options that are available within the Volumes menu for
advanced features administration:
Volumes
Volumes by Pool
Volumes by Host
Figure 8-42 Volume options menu

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8.4.1 Advanced volume functions
Click Volumes (as shown in Figure 8-42) and the Volumes window opens, as shown in
Figure 8-43.
Figure 8-43 Volume window
By default, this window lists all configured volumes on the system and provides the following
information:
Name: Shows the name of the volume. If there is a + sign next to the name, this sign
means that there are two copies of this volume. Click the + sign to expand the view and list
the copies, as shown in Figure 8-44 on page 381.
Status: Gives you status information about the volume, which can be online, offline, or
degraded.
Capacity: The disk capacity that is presented to the host is listed here. If there is a blue
volume listed next to the capacity, this means that this volume is a thin-provisioned
volume. Therefore, the listed capacity is the virtual capacity, which might be more than the
real capacity on the system.
Storage Pool: Shows in which Storage Pool the volume is stored. The primary copy is
shown unless you expand the volume copies.
UID: The volume unique identifier.
Host Mappings: Shows if a volume has host mapping. “Yes” when host mapping exists
(along with small server icon) and “No” when there are no hosting mappings.
Important: If you right-click anywhere in the blue title bar, you can customize the
volume attributes that are displayed. You might want to add some useful information
here.

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Figure 8-44 Expand volume copies
To create a volume, click New Volume and complete the steps that are described in 5.1,
“Provisioning storage from IBM Storwize V3700 and making it available to the host” on
page 190.

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You can right-click or highlight a volume and select Actions to see the available actions for a
volume, as shown in Figure 8-45.
Figure 8-45 Listing the action options for volume
Depending on which volume you highlighted, the following Volume options are available:
Map to Host
Unmap All Hosts
View Mapped Host
Duplicate Volume
Rename
Shrink
Expand
Migration to Another Pool
Export to Image Mode
Delete
Properties
The following Volume Copy options are available:
Add Mirror Copy
Thin Provisioned: Only available for thin-provisioned volumes:
– Shrink
– Expand
– Properties
All of these options are described next.

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8.4.2 Mapping a volume to a host
If you want to map a volume to a host, select Map to Host from the menu that is shown in
Figure 8-45 on page 382. Select the I/O Group and Host to which you want to map the
volume and click Next. Figure 8-46 shows the Modify Host Mappings menu.
Figure 8-46 Modify Host Mappings menu
After you select a host, the Modify Mappings window opens. In the upper left, you see the
selected host. The yellow volume is the selected volume that is ready to be mapped, as
shown in Figure 8-47. Click Map Volumes to apply the changes to the system.
Figure 8-47 Modify Host Mappings
After the changes are made, click Close to return to the All Volumes window.
Modify Mappings window: For more information about the Modify Mappings window, see
8.1.1, “Modifying Mappings menu” on page 356.

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8.4.3 Unmapping volumes from all hosts
If you want to remove all host mappings from a volume, click Unmap All Hosts (as shown in
Figure 8-45 on page 382). This action removes all host mappings, which means that no hosts
can access this volume. Enter the number of mappings that are affected and click Unmap, as
show in Figure 8-48.
Figure 8-48 Unmapping from host(s)
After the task completes, click Close to return to the All Volumes window.
8.4.4 Viewing a host that is mapped to a volume
If you want to know which host mappings are configured, highlight a volume and click View
Mapped Host (as shown in Figure 8-45 on page 382). The Host Maps tab of the Volume
Details window opens, as shown in Figure 8-49 on page 385. In this example, you see that
there is one existing host mapping to the vmware-sas volume.
Warning: Always ensure that you run the required procedures in your host operating
system before a procedure is unmapped.

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Figure 8-49 Volume to host mapping
If you want to remove a mapping, highlight the host and click Unmap from Host, which
removes the access for the selected host (after you confirm it). If several hosts are mapped to
this volume (for example, in a cluster), only the highlighted host is removed.
8.4.5 Duplicate Volume option
Use this option to duplicate a volume. If you want to duplicate an existing volume, highlight the
volume and click Duplicate Volume, as shown in Figure 8-50 on page 386.

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Figure 8-50 Duplicating volume
A Duplicate Volume window opens and you are prompt to enter the new volume name. IBM
Storwize V3700 automatically suggests a name by adding an incremental number in the end
of the new volume name, as shown in Figure 8-51.
Figure 8-51 Duplicate Volume
Click Duplicate and the IBM Storwize V3700 creates an independent volume that uses the
same characteristics as the source volume.
Important: When the Duplicate Volume function is used, you cannot specify a preferred
node.

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8.4.6 Renaming a volume
To rename a volume, select Rename (as shown in Figure 8-45 on page 382). The Rename
Volume window opens. Enter the new name, as shown in Figure 8-52.
Figure 8-52 Renaming a volume
If you click Reset, the name field is reset to the active name of the volume. Click Rename to
apply the changes and click Close after task window completes.
8.4.7 Shrinking a volume
The IBM Storwize V3700 has the option to shrink volumes. This feature should be used only if
your host operating system supports it. This capability reduces the capacity that is allocated
to the particular volume by the amount that you specify. To shrink a volume, click Shrink, as
shown in Figure 8-45 on page 382. You can enter the new size or by how much the volume
should shrink. If you enter a value, the other line updates automatically, as shown in
Figure 8-53.
Figure 8-53 Shrink Volume
Click Shrink to start the process and then click Close when task window completes to return
to the All Volumes window.
Run the required procedures on your host after the shrinking process.
Important: Before a volume is shrunk, ensure that the volume is not mapped to any host
object and does not contain data. If both conditions are ignored, it is likely that your
Operating System logs disk errors or data corruption.
Important: For volumes that contain more than one copy, you might receive a
CMMVC6354E error; use the lsvdisksyncprogress command to view the synchronization
status. Wait for the copy to synchronize. If you want the synchronization process to
complete more quickly, increase the rate by running the chvdisk command. When the copy
is synchronized, resubmit the shrink process.

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8.4.8 Expanding a volume
If you want to expand a volume, click Expand (as shown in Figure 8-45 on page 382) and the
Expand Volume window opens. Before you continue, check if your operating system supports
online volume expansion. Enter the new volume size and click Expand, as shown in
Figure 8-54.
Figure 8-54 Expand volume
After the tasks complete, click Close to return to the All Volumes window.
Run the required procedures in your operating system to use the available space.
8.4.9 Migrating a volume to another storage pool
The IBM Storwize V3700 supports online volume migration while applications are running. By
using volume migration, you can move volumes between storage pools, whether the pools are
internal pools or on an external storage system. The migration process is a low priority and
one extent is moved at a time.
To migrate a volume to another storage pool, click Migrate to Another Pool (as shown in
Figure 8-45 on page 382). The Migrate Volume Copy window opens. If your volume consists
of more than one copy, you are asked which copy you want to migrate to another storage
pool, as shown in Figure 8-55 on page 389.
If the selected volume consists of one copy, this option does not appear. Notice that the
vmware-sas volume has 2 copies stored into two different storage pools (Figure 8-55 on
page 389). The storage pools to which they belong are shown in parentheses.
Important: For the migration to be acceptable, the source and target Storage Pool must
have the same extent size. For more information about extent size, see Chapter 1.1, “IBM
Storwize V3700 overview” on page 2.

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Figure 8-55 Migrate Volume
Select the new target storage pool and click Migrate, as shown in Figure 8-55.
The volume copy migration starts, as shown in Figure 8-56. Click Close to return to the All
Volumes window.
Figure 8-56 Volume Copy Migration starts
Depending on the size of the volume, the migration process can take some time. You can
monitor the status of the migration in the running tasks bar at the bottom of the window.
Volume migration tasks cannot be interrupted.
After the migration completes, the “copy 0” from the vmware-sas volume is shown in the new
storage pool, as shown in Figure 8-57 on page 390.

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Figure 8-57 Volume showing at new Storage Pool
The volume copy was migrated without any downtime to the new storage pool. It is also
possible to migrate both volume copies to other storage pools.
Another way to migrate volumes to a different pool is by using the volume copy feature, as
described in 8.6.5, “Migrating volumes by using the volume copy features” on page 406.
8.4.10 Deleting a volume
To delete a volume, select Delete, as shown in Figure 8-45 on page 382.
You must enter the number of volumes that you want to delete. Select the option to force
deletion if the volume has host mappings or is used in FlashCopy or RemoteCopy mappings.
Figure 8-58 shows the Delete Volume window.
Figure 8-58 Delete volume
Click Delete and the volume is removed from the system.
Click Close to return to Volumes window.

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8.5 Volume properties
This section provides an overview of all available information that is related to IBM Storwize
V3700 volumes.
To open the advanced view of a volume, select Properties and the Volume Details window
opens, as shown in Figure 8-59. The following tabs are available in this window:
Overview
Host Maps
Member MDisk
Figure 8-59 Volume Details Overview
8.5.1 Overview tab
The Overview tab that is shown in Figure 8-60 gives you a complete overview of the volume
properties. In the left part of the window, you find common volume properties. In the right part
of the window, you see information about the volume copies. The detailed view was chosen
by selecting the Show Details option in the lower left.
Important: You must force the deletion if the volume has host mappings or is used in
FlashCopy or RemoteCopy mappings. To be safe, always ensure the volume has no
association before you delete it.

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Figure 8-60 Volume properties window
The following details are available:
Volume Properties:
– Volume Name: Shows the name of the volume.
– Volume ID: Shows the ID of the volume. Every volume has a system-wide unique ID.
– Status: Gives status information about the volume, which can be online, offline, or
degraded.
– Capacity: Shows the capacity of the volume. If the volume is thin-provisioned, this
number is the virtual capacity; the real capacity is displayed for each copy.
–# of Flash Copy Mappings: The number of existing Flash Copy relationships. For more
information, see Chapter 10.1, “FlashCopy” on page 450.
– Volume UID: The volume unique identifier.
– Accessible I/O Group: Shows the I/O Group.
– Preferred Node: Specifies the ID of the preferred node for the volume.
– I/O Throttling: It is possible to set a maximum rate at which the volume processes I/O
requests. The limit can be set in I/Os or MBps. This feature is an advanced feature and
can be enabled only through the CLI, as described in Appendix A, “Command-line
interface setup and SAN Boot” on page 593.
– Mirror Sync Rate: After creation, or if a volume copy is offline, the mirror sync rate
weights the synchronization process. Volumes with a high sync rate (100%) complete
the synchronization faster than volumes with a lower priority. By default, the rate is set
to 50% for all volumes.
– Cache Mode: Shows whether the cache is enabled or disabled for this volume.

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– Cache State: Provides feedback if open I/O requests are inside the cache that are not
destaged to the disks.
– UDID (OpenVMS): The unit device identifiers are used by OpenVMS hosts to access
the volume.
Copy Properties:
– Storage Pool: Provides information about which pool the copy is in, what type of copy it
is (generic or thin-provisioned), the status of the copy and Easy Tier status.
– Capacity: Shows the allocated (used) and the virtual (Real) capacity from both Tiers
(SSD and HDD) and the warning threshold, and the grain size for Thin-Provisioned
volumes.
If you want to modify any of these changeable settings, click Edit and the window changes to
modify mode. Figure 8-61 shows the Volume Details Overview tab in modify mode.
Figure 8-61 Modify Volume Details
Inside the Volume Details window, the following properties can be changed:
Volume Name
Mirror Sync Rate
Cache Mode
UDID
Make any required changes and click Save.

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8.5.2 Host Maps tab
The second tab of the Volume Details window is Host Maps, as shown in Figure 8-62. All
hosts that are mapped to the selected volume are listed in this view.
Figure 8-62 Host Maps
To unmap a host from the volume, highlight it and click Unmap from Host. Confirm the
number of mappings to remove and click Unmap. Figure 8-63 shows the Unmap Host
window.
Figure 8-63 Unmap Host

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The changes are applied to the system. The selected host no longer has access to this
volume. Click Close to return to the Host Maps window. For more information about host
mappings, see 8.3, “Host mappings overview” on page 377.
8.5.3 Member MDisk tab
The third and last tab is Member MDisk, which lists all MDisks on which the volume is located.
Select a copy and the associated MDisks is shown in the window, as shown in Figure 8-64.
Figure 8-64 Member MDisk tab

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Highlight an MDisk and click Actions to see the available tasks, as shown in Figure 8-65 on
page 396). The Show Details option on the lower left side does not provide more information.
For more information about the available tasks, see Chapter 7, “Storage pools” on page 313.
Figure 8-65 MDisk action menu
Click Close to return to the All Volumes window.
8.5.4 Adding a mirrored volume copy
If you have a volume that consists of only one copy, you can add a second mirrored copy to
the volume. This action creates a second online copy of your volume. This second copy can
be generic or thin-provisioned.
In addition, you can use this alternative method to migrate data across storage pools with
different extent size.
To add a second copy, highlight the volume and click Actions  Volume Copy Actions 
Add Mirrored Copy, as shown in Figure 8-66 on page 397.

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Figure 8-66 Add Mirrored Copy
Select the storage pool to which the new copy should be created, as shown in Figure 8-67. If
the new copy should be thin-provisioned, select the Thin-Provisioned option and click Add
Copy.
Figure 8-67 Select Storage Pool
The copy is created after you click Add Copy and data starts to synchronize as a background
task. Figure 8-68 on page 398 shows you that the volume named volume_001 holds two
volume copies.

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Figure 8-68 Volume containing two copies
8.5.5 Editing Thin-Provisioned volume properties
The processes that are used to modify the volume size presented to a host are described in
8.4.7, “Shrinking a volume” on page 387 and 8.4.8, “Expanding a volume” on page 388.
However, if you have a thin-provisioned volume, you can also edit the allocated size and the
warning thresholds. To edit these settings, select the volume copy, then select Actions 
Thin-Provisioned or highlight and right-click the volume copy and click Thin-Provisioned 
Shrink, as shown in Figure 8-69.
The following options are available, as shown in Figure 8-69:
Shrink
Expand
Edit Properties
Figure 8-69 Working with Thin-Provisioned volumes
These changes are made only to the internal storage; no changes to your host are necessary.
Shrinking Thin-Provisioned space
Select Shrink (as shown in Figure 8-69) to reduce the allocated space of a thin-provisioned
volume. Enter the amount by which the volume should shrink or the new final size, and click
Shrink.

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Figure 8-70 shows the Shrink Volume window.
Figure 8-70 Shrink Volume
After the task completes, click Close. The allocated space of the thin-provisioned volume is
reduced.
Expanding Thin-Provisioned space
To expand the allocated space of a thin-provisioned volume, select Expand, as shown in
Figure 8-69 on page 398. Enter the amount by which space should be allocated or the new
final size and click Expand. In our example (as shown in Figure 8-71), we are expanding the
Thin-Provisioned space by 10 Mb.
Figure 8-71 Expand Volume
The new space is now allocated. Click Close after task is completed.
Editing Thin-Provisioned properties
To edit thin-provisioned properties, select Edit Properties, as shown in Figure 8-69 on
page 398. Edit the settings (if required) and click OK to apply the changes.
Deallocating extents: You can only deallocate extents that do not include stored data on
them. If the space is allocated because there is data on them, you cannot shrink the
allocated space and an out-of-range warning message appears.

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Figure 8-72 on page 400 shows the Edit Properties window.
Figure 8-72 Thin-Provisioned volume properties.
After the task completes, click Close to return to the All Volumes window.
8.6 Advanced volume copy functions
In 8.4.1, “Advanced volume functions” on page 380, we described all of the available actions
at a volume level and how to create a second volume copy. In this section, we focus on
volumes that consist of two volume copies and how to apply the concept of two copies for
business continuity and data migration.
If you expand the volume and highlight a copy, the following volume copy actions become
available, as shown in Figure 8-73:
Thin-provisioned (for Thin volumes)
Make Primary (for non-primary copy)
Split into New Volume
Validate Volume Copies
Delete Copy option
Figure 8-73 Volume copy actions

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If you review the volume copies that are shown in Figure 8-73 on page 400, you see that one
of the copies has a star displayed next to its name, as also shown in Figure 8-74.
Figure 8-74 Volume copy names
Each volume has a primary and a secondary copy, and the star indicates the primary copy.
The two copies are always synchronized, which means that all writes are destaged to both
copies, but all reads are always done from the primary copy. Two copies per volume are the
maximum number configurable and you can change the roles of your copies.
To accomplish this task, highlight the secondary copy and then click Actions  Make
Primary. Usually, it is a best practice to place the volume copies on storage pools with similar
performance because the write performance is constrained if one copy is on a lower
performance pool than the other.
Figure 8-75 shows the secondary copy Actions menu.
Figure 8-75 Make primary
If you demand high read performance only, another possibility is to place the primary copy in
an SSD pool and the secondary copy in a normal disk storage pool. This action maximizes
the read performance of the volume and makes sure that you have a synchronized second
copy in your less expensive disk pool. It is possible to migrate online copies between storage
pools. For more information about how to select which copy you want to migrate, see 8.4.9,
“Migrating a volume to another storage pool” on page 388.
Click Make Primary and the role of the copy is changed to online. Click Close when the task
completes.
The volume copy feature also is a powerful option for migrating volumes, as described in
8.6.5, “Migrating volumes by using the volume copy features” on page 406.

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8.6.1 Thin-provisioned
This menu item includes the same functions that are described in “Shrinking Thin-Provisioned
space” on page 398, “Expanding Thin-Provisioned space” on page 399, and “Editing
Thin-Provisioned properties” on page 399. You can specify the same settings for each volume
copy.
Figure 8-76 shows the Thin-provisioned menu item.
Figure 8-76 Thin-provisioned menu item
8.6.2 Splitting into a new volume
If your two volume copies are synchronized, you can split one of the copies to a new volume
and map this new volume to another host. From a storage point of view, this procedure can be
performed online, which means you can split one copy from the volume and create a copy
from the remaining one without any host impact. However, if you want to use the split copy for
testing or backup purposes, you must make sure that the data inside the volume is consistent.
Therefore, you must flush the cached data to storage to make the copies consistent.
For more information about flushing the data, see your operating system documentation. The
easiest way to flush the data is to shut down the hosts or application before a copy is split.
In our example, volume win_vol_01 has two copies, Copy 0 as primary and Copy 1 as
secondary. To split a copy, click Split into New Volume (as shown in Figure 8-73 on
page 400) on either copy and it becomes a new volume in its own right. The remaining copy
automatically becomes the primary for the original volume.
Optionally, enter a name for the new volume and click Split Volume Copy.

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Figure 8-77 shows the Split Volume Copy window.
Figure 8-77 Split Volume Copy
After the task completes, click Close to return to the All Volumes window, where the copy
appears as a new volume named vdisk0 that can be mapped to a host, as shown in
Figure 8-78.
Figure 8-78 All Volumes - New volume from split copy
Example 8-1 Output of lsvdisksyncprogress command
IBM_Storwize:mcr-atl-cluster-01:superuser>lsvdisksyncprogress
vdisk_id vdisk_name copy_id progress estimated_completion_time
3 vmware-sas 1 3 130605014819
14 thin-volume 1 38 130606032210
25 win_vol_01 1 55 130604121159
IBM_Storwize:mcr-atl-cluster-01:superuser>
Important: If you receive an error message while you are splitting volume copy (error
message code CMMVC6357E), use the lsvdisksyncprogress command to view the
synchronization status or wait for the copy to synchronize. Example 8-1 shows an output of
lsvdisksyncprogress command.

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8.6.3 Validate Volume Copies option
The IBM Storwize V3700 GUI provides capabilities to check volume copies that are identical
or to process the differences between them.
To validate the copies of a mirrored volume, complete the following steps:
1.Select Validate Volume Copies, as shown in Figure 8-73 on page 400. The Validate
Volume Copies window opens, as shown in Figure 8-79.
Figure 8-79 Validate Volume Copies
The following options are available:
– Generate Event of Differences
Use this option if you want to verify only that the mirrored volume copies are identical. If
any difference is found, the command stops and logs an error that includes the logical
block address (LBA) and the length of the first difference. Starting at a different LBA
each time, you can use this option to count the number of differences on a volume.
– Overwrite Differences
Use this option to overwrite contents from the primary volume copy to the other volume
copy. The command corrects any differing sectors by copying the sectors from the
primary copy to the copies that are compared. Upon completion, the command
process logs an event which indicates the number of differences that were corrected.
Use this option if you are sure that the primary volume copy data is correct or that your
host applications can handle incorrect data.
– Return Media Error to Host
Use this option to convert sectors on all volume copies that contain different contents
into virtual medium errors. Upon completion, the command logs an event, which
indicates the number of differences that were found, the number that were converted
into medium errors, and the number that were not converted. Use this option if you are
unsure what the correct data is and you do not want an incorrect version of the data to
be used.
2.Select which action to perform and click Validate to start the task. The volume is now
checked. Click Close.
Figure 8-80 on page 405 shows the output when the volume copy Generate Event of
Differences option is chosen.

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Figure 8-80 Volume copy validation output
The validation process runs as a background process and can take some time, depending on
the volume size. You can check the status in the Running Tasks window, as shown in
Figure 8-81.
Figure 8-81 Validate Volume Copies: Running Tasks
8.6.4 Delete Volume Copy option
Click Delete (as shown in Figure 8-73 on page 400) to delete a volume copy. The copy is
deleted, but the volume remains online by using the remaining copy. Confirm the deletion
process by clicking YES. Figure 8-82 on page 406 shows the copy deletion window.

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Figure 8-82 Delete a copy
After the copy is deleted, click Close to return to the All Volumes window.
8.6.5 Migrating volumes by using the volume copy features
In the previous sections, we showed that it is possible to create, synchronize, split, and delete
volume copies. A combination of these tasks can be used to migrate volumes to other storage
pools.
The easiest way to migrate volume copies is to use the migration feature that is described in
8.4.9, “Migrating a volume to another storage pool” on page 388. If you use this feature, one
extent after another is migrated to the new storage pool. However, the use of volume copies
provides another way to migrate volumes if you have different storage pool characteristic in
terms of extent size.
To migrate a volume, complete the following steps:
1.Create a second copy of your volume in the target storage pool. For more information, see
8.5.4, “Adding a mirrored volume copy” on page 396.
2.Wait until the copies are synchronized.
3.Change the role of the copies and make the new copy the primary copy. For more
information, see 8.6, “Advanced volume copy functions” on page 400.
4.Split or delete the old copy from the volume. For more information, see 8.6.2, “Splitting into
a new volume” on page 402 or 8.6.4, “Delete Volume Copy option” on page 405.
This migration process requires more user interaction with the IBM Storwize V3700 GUI, but it
offers some benefits.
As an example, we look at migrating a volume from a tier 1 storage pool to a lower
performance tier 2 storage pool.
In step 1, you create the copy on the tier 2 pool, while all reads are still performed in the tier 1
pool to the primary copy. After synchronization, all writes are destaged to both pools, but the
reads are still done only from the primary copy.
Considering the copies are fully synchronized, now you can online switch the role of them
(step 3), and complete performance analysis on the new pool. When you are done testing
your lower performance pool, you can split or delete the old copy in tier 1 or switch back to tier
1 in seconds if the tier 2 storage pool did not meet your requirements.

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8.7 Volumes by Pool feature
To see an overview of which volumes are on which storage pool, click Volumes by Pool, as
shown in Figure 8-83.
Figure 8-83 Volumes by Pool

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The Volumes by Pool window opens, as shown in Figure 8-84 on page 408.
Figure 8-84 Volumes by Pool window
The left pane is named Pool Filter, and all of your existing storage pools are shown there. For
more information about storage pools, see Chapter 7, “Storage pools” on page 313.
In the upper right, you see information about the pool that you selected in the pool filter, the
following information is also shown:
Pool icon: Because storage pools might have different characteristics, you can change the
storage pool icon. For more information about making the changes, see 7.5, “Working with
Storage Pools” on page 348.
Pool Name: This is the name given during the creation of the storage pool. For more
information about changing the storage pool name, see, Chapter 7, “Storage pools” on
page 313.
Pool Details: This shows you the information about the storage pools such as status, the
number of managed disks, and easy tier status.
Volume allocation: This shows you the amount of capacity that is allocated to volumes
from this storage pool.
The lower right section (as shown in Figure 8-85 on page 409) lists all volumes that have at
least one copy in the selected storage pool and the following information is provided:
Name: The name of the volume.
Status: The status of the volume.
Capacity: The capacity that is presented to host.
UID: The volume unique identifier.
Host Mappings: Indicates if host mapping exists.

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Figure 8-85 Volumes by Storage Pool
It is also possible to create volumes from this window. Click Create Volume to start the
volume creation window. The steps are the same as those that are described in Chapter 5,
“Basic volume configuration” on page 189.
If you highlight a volume and select Actions or right-click the volume, the same options as
described in 8.4, “Advanced volume administration” on page 379 appears.

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8.8 Volumes by Host feature
To see an overview about which volume a host can access, click Volumes by Host, as shown
in Figure 8-83 on page 407 and the Volumes by Host window opens, as shown in Figure 8-86.
Figure 8-86 Volumes by Host
In the left pane of the view is the Host Filter. If you select a host, its properties appear in the
right pane; for example host name, the number of ports and host type.
The hosts with an orange cable represent Fibre Channel or FCoE hosts, the black cable
represents the SAS hosts, and blue cable represents the iSCSI hosts.
The volumes that are mapped to this host are listed, as shown in Figure 8-87.
Figure 8-87 Volumes by host.
It is also possible to create a volume from this window. If you click New Volume, the same
wizard that is described in 5.1, “Provisioning storage from IBM Storwize V3700 and making it
available to the host” on page 190 opens.
If you highlight the volume, the Actions button becomes available and the options are the
same as described in 8.4, “Advanced volume administration” on page 379.

© Copyright IBM Corp. 2013. All rights reserved.
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Chapter 9.
Easy Tier
In today’s storage market, solid-state drives (SSDs) are emerging as an attractive alternative
to hard disk drives (HDDs). Because of their low response times, high throughput, and
IOPS-energy-efficient characteristics, SSDs have the potential to allow your storage
infrastructure to achieve significant savings in operational costs. However, the current
acquisition cost per GB for SSDs is currently much higher than for HDDs. SSD performance
depends a lot on workload characteristics, so SSDs must be used with HDDs. It is critical to
choose the right mix of drives and the right data placement to achieve optimal performance at
low cost. Maximum value can be derived by placing “hot” data with high IO density and low
response time requirements on SSDs, while targeting HDDs for “cooler” data that is accessed
more sequentially and at lower rates.
Easy Tier automates the placement of data among different storage tiers and boosts your
storage infrastructure performance to achieve optimal performance through a software,
server, and storage solution.
This chapter describes the Easy Tier disk performance optimization feature and how to
activate the Easy Tier process for evaluation purposes and for automatic extent migration.
Information is also included about the monitoring tool, Storage Tier Advisor Tool (STAT) and
Tivoli Storage Productivity Center for performance monitoring.
This chapter includes the following topics:
Easy Tier overview
Easy Tier for IBM Storwize V3700
Easy Tier process
Easy Tier configuration using the GUI
Easy Tier configuration using the CLI
IBM Storage Tier Advisor Tool
Tivoli Storage Productivity Center
Administering and reporting an IBM Storwize V3700 system through Tivoli Storage
Productivity Center
9

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9.1 Easy Tier overview
Easy Tier is an optional licensed feature of IBM Storwize V3700 that brings enterprise
storage functions to the entry segment. It enables automated subvolume data placement
throughout different storage tiers to intelligently align the system with current workload
requirements and to optimize the usage of SSDs. This functionality includes the ability to
automatically and non-disruptively relocate data (at the extent level) from one tier to another
tier in either direction to achieve the best available storage performance for the workload in
your environment. Easy Tier reduces the I/O latency for hot spots, but it does not replace
storage cache. Both Easy Tier and storage cache solve a similar access latency workload
problem, but these two methods weigh differently in the algorithmic construction based on
“locality of reference”, recency, and frequency. Because Easy Tier monitors I/O performance
from the device end (after cache), it can pick up the performance issues that cache cannot
solve and complement the overall storage system performance.
In general, without Easy Tier, storage environments are monitored at the volume level and the
entire volume is placed on an appropriate storage tier. Determining the I/O at the extent level
is too complex and manually moving extents to an appropriate storage tier and reacting to
workload changes is not feasible.
Easy Tier is a performance optimization function that overcomes this issue because it
automatically migrates (or moves) extents that belong to a volume between different storage
tiers, as shown in Figure 9-1. Because this migration works at the extent level, it is often
referred to as
sub-LUN migration
.
Figure 9-1 Easy Tier
You can enable Easy Tier for storage on a volume basis. It monitors the I/O activity and
latency of the extents on all Easy Tier enabled volumes over a 24-hour period. Based on the
performance log, it creates an extent migration plan and dynamically moves high activity or
hot extents to a higher disk tier within the same storage pool, and moves extents whose
activity has dropped off, or cooled, from higher disk tier MDisks back to a lower tier MDisk.

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To enable this migration between MDisks with different tier levels, the target storage pool must
consist of different characteristic MDisks. These pools are called
multitiered storage pools
.
IBM Storwize V3700 Easy Tier is optimized to boost the performance of storage pools that
contain HDDs and SSDs.
To identify the potential benefits of Easy Tier in your environment before actually installing
higher MDisk tiers, such as SSDs, it is possible to enable the Easy Tier monitoring on
volumes in single-tiered storage pools. Although the Easy Tier extent migration is not possible
within a single-tiered pool, the Easy Tier statistical measurement function is possible.
Enabling Easy Tier on a single-tiered storage pool starts the monitoring process and logs the
activity of the volume extents. In this case, Easy Tier creates a migration plan file that can
then be used to show a report on the number of extents that are appropriate for migration to
higher level MDisk tiers, such as SSDs.
The IBM Storage Tier Advisor Tool (STAT) is a no-cost tool that helps you to analyze this data.
If you do not have an IBM Storwize V3700, use Disk Magic to get a better idea about the
required number of SSDs that are appropriate for your workload. If you do not have any
workload performance data, a good starting point can be to add about 5% of net capacity of
SSDs to your configuration. But this ratio is heuristics-based and changes according to
different applications or different disk tier performance in each configuration. For database
transactions, a ratio of fast SAS or FC drives to SSD is about 6:1 to achieve the optimal
performance, but this ratio depends on the environment on which it is implemented.
9.2 Easy Tier for IBM Storwize V3700
This section describes the terms and gives an example of an implementation of Easy Tier.
After reading this section, you should understand the Easy Tier concept as it relates to the
IBM Storwize V3700.
9.2.1 Tiered storage pools
With IBM Storwize V3700, we must differentiate between the following types of storage pools:
Single-tiered storage pools
Multitiered storage pools
As shown in Figure 9-2 on page 414, single-tiered storage pools include one type for disk tier
attribute. Each disk should have the same size and performance characteristics. Multitiered
storage pools are populated with two different disk tier attributes, which means high
performance tier SSD disks, and generic HDD disks. A volume migration, as described in
Chapter 8, “Advanced host and volume administration” on page 353, is when the complete
volume is migrated from one storage pool to another storage pool. An Easy Tier data
migration only moves extents inside the storage pool to different tiered disks.

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Figure 9-2 Tiered storage pools
9.3 Easy Tier process
The Easy Tier feature consists of four main processes. Figure 9-3 shows the flow between
these processes. These processes ensure that the extent allocation in multitiered storage
pools is optimized for the best performance that is monitored on your workload in the last 24
hours. At five-minute intervals, statistics about extent usage are collected. Every 24 hours of
elapsed time, a heat map is created that is used by the internal algorithms to generate a
migration plan and a summary report. This migration plan contains information about which
extents to promote to the upper tier or to demote to the lower tier, and the summary report is
used by STAT (see 9.6, “IBM Storage Tier Advisor Tool” on page 433).
Figure 9-3 Easy Tier process flow
Also, Easy Tier is based on an algorithm with a threshold to evaluate if an extent is cold or
hot. If an extent activity is below this threshold, it is not considered by the algorithm to be
moved to the SSD tier.
The four main processes and the flow between them are described in the following sections.

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9.3.1 I/O Monitoring
The I/O Monitoring (IOM) process operates continuously and monitors host volumes for I/O
activity. It collects performance statistics for each extent and derives averages for a rolling
24-hour period of I/O activity.
Easy Tier makes allowances for large block I/Os and thus only considers I/Os of up to 64 KB
as migration candidates.
This process is an efficient process and adds negligible processing impact to the IBM
Storwize V3700 node canisters.
9.3.2 Data Placement Advisor
The Data Placement Advisor (DPA) uses workload statistics to make a cost benefit decision
about which extents should be candidates for migration to a higher performance (SSD) tier.
This process also identifies extents that must be migrated back to a lower (HDD) tier.
9.3.3 Data Migration Planner
By using the extents that were previously identified, the Data Migration Planner (DMP)
process builds the extent migration plan for the storage pool.
9.3.4 Data Migrator
The Data Migrator (DM) process involves scheduling and the actual movement or migration of
the volume’s extents up to, or down from, the high disk tier. The extent migration rate is
capped to a maximum of up to 15 MBps. This rate equates to around 2 TB a day that is
migrated between disk tiers, as shown in Figure 9-4 on page 416.

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Figure 9-4 Easy Tier Data Migrator
9.3.5 Easy Tier operating modes
IBM Storwize V3700 offers the following operating modes for Easy Tier:
Easy Tier - OFF (for more information, see “Easy Tier - OFF” on page 416.)
Evaluation Mode (for more information, see “Evaluation Mode” on page 416.)
Auto Data Placement Mode (for more information, see “Automatic Data Placement Mode”
on page 416.)
Easy Tier - OFF
Easy Tier can be turned off. No statistics are recorded and no extents are moved.
Evaluation Mode
If you turn on Easy Tier in a single-tiered storage pool, it runs in Evaluation Mode, which
means it measures the I/O activity for all extents. A statistic summary file is created and can
be offloaded from the IBM Storwize V3700. This file can be analyzed with the IBM Storage
Tier Advisory Tool, as described in 9.6, “IBM Storage Tier Advisor Tool” on page 433. This
analysis shows the benefits for your workload if you were to add SSDs to your pool before any
hardware acquisition.
Automatic Data Placement Mode
This operating mode is enabled by default if you create a multitiered storage pool. Easy Tier is
also enabled on all volumes inside the multitiered storage pool. The extents are migrated
dynamically by the Easy Tier processes to achieve the best performance. The movement is
not apparent to the host server and applications, and it only provides increased performance.

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If you do want to disable Auto Data Placement Mode for single volumes inside a multitiered
storage pool, it is possible to turn off at the volume level. This action excludes the volume
from Auto Data Placement Mode and measures the I/O statistics only.
The statistic summary file can be offloaded for input to the advisor tool. The tool produces a
report on the extents that are moved to SSD and a prediction of performance improvement
that can be gained if SSD drives were added.
9.3.6 Easy Tier rules
The following operating rules exist when IBM Easy Tier is used on the IBM Storwize V3700:
Automatic data placement and extent I/O activity monitors are supported on each copy of
a mirrored volume. Easy Tier works with each copy independently of the other copy.
Easy Tier works with all striped volumes, including the following types:
– Generic volumes
– Thin-provisioned volumes
– Mirrored volumes
– Thin-mirrored volumes
– Global and Metro Mirror sources and targets
Easy Tier automatic data placement is not supported for image mode or sequential
volumes. I/O monitoring for such volumes is supported, but you cannot migrate extents on
such volumes unless you convert image or sequential volume copies to striped volumes.
If possible, IBM Storwize V3700 creates new volumes or volume expansions by using
extents from HDD tier MDisks, but uses extents from SSD tier MDisks if no HDD space is
available.
When a volume is migrated out of a storage pool that is managed with Easy Tier,
Automatic Data Placement Mode is no longer active on that volume. Automatic Data
Placement is also turned off while a volume is being migrated, even if it is between pools
that both have Easy Tier Automatic Data Placement enabled. Automatic Data Placement
for the volume is re-enabled when the migration is complete.
SSD performance is dependent on block sizes, and small blocks perform much better than
larger ones. Because Easy Tier is optimized to work with SSD, it decides if an extent is hot
by measuring I/O smaller than 64 KB, but it migrates the entire extent to the appropriate
disk tier.
As extents are migrated, the use of smaller extents makes Easy Tier more efficient.
The first migration of hot data to SSD starts about one hour after Automatic Data
Placement Mode is enabled, but it takes up to 24 hours to achieve optimal performance.
In the current IBM Storwize V3700 Easy Tier implementation, it takes about two days
before hot spots are considered being moved from SSDs, which prevents hot spots from
being moved from SSDs if the workload changes over a weekend.
If you run an unusual workload over a longer period, Automatic Data Placement can be
turned off and on online, to avoid data movement.
Volume mirroring: Volume mirroring can have different workload characteristics on
each copy of the data because reads are normally directed to the primary copy and
writes occur to both. Thus, the number of extents that Easy Tier migrates to SSD tier
probably is different for each copy.

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Depending on which storage pool and which Easy Tier configuration is set, a volume copy
can have the Easy Tier states that are shown in Table 9-1.
Table 9-1 Easy Tier states
Storage pool Single-tiered or
multitiered storage
pool
Volume copy
Easy Tier
setting
Easy Tier status
Off Single-tiered Off Inactive
a
a. When the volume copy status is inactive, no Easy Tier functions are enabled for that
volume copy.
Off Single-tiered On Inactive
a
Off Multitiered Off Inactive
a
Off Multitiered On Inactive
a
Auto
b
b. The default Easy Tier setting for a storage pool is auto, and the default Easy Tier setting for
a volume copy is on. This scenario means that Easy Tier functions are disabled for storage
pools with a single tier, and that automatic data placement mode is enabled for all striped
volume copies in a storage pool with two tiers.
Single-tiered Off Inactive
a
Auto
b
Single-tiered On Inactive
a
Auto
b
Multitiered Off Measured
c
c. When the volume copy status is measured, the Easy Tier function collects usage statistics for
the volume, but automatic data placement is not active.
Auto
b
Multitiered On Active
d

e
d. If the volume copy is in image or sequential mode or is being migrated, then the volume copy
Easy Tier status is measured instead of active.
e. When the volume copy status is active, the Easy Tier function operates in automatic data
placement mode for that volume.
On Single-tiered Off Measured
c
On Single-tiered On Measured
c
On Multitiered Off Measured
c
On Multitiered On Active
d

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9.4 Easy Tier configuration using the GUI
This section describes how to activate Easy Tier by using the IBM Storwize V3700 GUI.
9.4.1 Creating multitiered pools: Enable Easy Tier
In this section, we describe how to create multitiered storage pools by using the GUI. When a
storage pool changes from single-tiered to multitiered, Easy Tier is enabled by default for the
pool and on all volume copies inside this pool.
To create multitiered pools, completed the following steps:
1.Click Volumes  Volumes by Pool. Figure 9-5 shows that, in our example, the
V3700_Pool_1 storage pool exists as a single tiered Storage pool and Easy Tier is
inactive. We now add SSD drives to the single tiered Storage pool, V3700_Pool_2 storage
pool to enable Easy Tier.
Figure 9-5 Single-tiered pool
2.Click Pools  Internal Storage. Figure 9-6 shows that one internal SSD drive is available
and is in a candidate status.
Figure 9-6 Internal SSDs

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3.Click Configure Storage and the Storage Configuration wizard opens. Figure 9-7 shows
the first step of the configuration wizard.
Figure 9-7 Configure Internal Storage window
The wizard recommends the use of the SSDs to enable Easy Tier. If you select Use
recommended configuration, it selects the recommended RAID level and hot spare
coverage for your system automatically, as shown in Figure 9-8.
Figure 9-8 Recommended configuration

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If you select Select a different configuration (as shown in Figure 9-9 on page 421), you
can select the preset.
Figure 9-9 Select a preset menu
4.Choose a custom RAID level, or you can also select the SSD Easy Tier preset to review
and modify the recommended configuration. Because we do not have enough drives in
our configuration in this example, the SSD Easy Tier preset is unavailable from the preset
selection. When this preset is available, it configures a RAID 10 array with a spare goal of
one drive. In this example, we create a RAID 0 array (this is not best practice and is not
used in a production environment). Because there are not enough drives, an error
message is displayed, as shown in Figure 9-10 on page 422.

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Figure 9-10 Select RAID 0 preset
This error message can be avoided if the Automatically configure spares option is cleared, as
shown in Figure 9-11. A RAID 0 array with one drive and no spares is created.
Figure 9-11 Array creation configuration summary
5.To create a multitiered storage pool, the SSDs must be added to an existing generic HDD
pool. Select Expand an existing pool (see Figure 9-12 on page 423) and select the pool
you want to change to a multitiered storage pool. In our example, V3700_Pool_2 is
selected. Click Finish.

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Figure 9-12 Expand an existing pool
6.Now the array is configured on the SSDs and added to the selected storage pool. Click
Close after the task completes, as shown in Figure 9-13.
Figure 9-13 Array creation completed task
Figure 9-14 on page 424 shows that the internal SSD drives usage has now changed to
Member and that the wizard created an MDisk that is named mdisk2.

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Figure 9-14 SSD usage has changed
In Figure 9-15, you see that the new MDisk is now part of the V3700_Pool_2 storage pool and
that the Pool icon changed to show . This means that the status of the Easy Tier changed
to Active. In this pool, Automatic Data Placement Mode is started and the Easy Tier
processes starts to work.
Figure 9-15 Easy Tier active
By default, Easy Tier is now active in this storage pool and all its volumes. Figure 9-16 shows
an example of three volumes in the multitiered storage pool.
Figure 9-16 Volumes by pool

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If you open the properties of a volume by clicking Actions
 Properties, you can also see
that Easy Tier is enabled on the volume by default, as shown in Figure 9-17.
Figure 9-17 Easy Tier enabled volume
If a volume has more than one copy, Easy Tier can be enabled and disabled on each copy
separately. This action depends on the storage pool where the volume copy is defined. A
volume with two copies is stored in two different storage pools, as shown in Figure 9-18.
Figure 9-18 Easy Tier by Copy

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If you want to enable Easy Tier on the second copy, change the storage pool of the second
copy to a multitiered storage pool by repeating these steps.
9.4.2 Downloading Easy Tier I/O measurements
Easy Tier is now enabled and Automatic Data Placement Mode is active. Extents are
automatically migrated to or from high performance disk tiers, and the statistic summary
collection is now active. The statistics log file can be downloaded to analyze how many
extents were migrated and to monitor if it makes sense to add more SSDs to the multitiered
storage pool.
To download the statistics file, complete the following steps:
1.Click Settings  Support, as shown in Figure 9-19.
Figure 9-19 Settings menu
2.Click Show full log listing, as shown in Figure 9-20.
Figure 9-20 Download files menu

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This action lists all the log files that are available to download (see Figure 9-21). The Easy
Tier log files are always named dpa_heat.canister_name_date.time.data.
Figure 9-21 Download dpa_heat file
If you run Easy Tier for a longer period, it generates a heat file at least every 24 hours.
The time and date of the file creation is included in the file name. The heat log file always
includes the measured I/O activity of the last 24 hours.
3.Right-click the dpa_heat.canister_name_date.time.data file and click Download. Select
the file for Easy Tier measurement for the most representative time.
You can also use the search field on the right to filter your search, as shown in
Figure 9-22.
Figure 9-22 Filter your search
Depending on your browser settings, the file is downloaded to your default location, or you
are prompted to save it to your computer. This file can be analyzed as described in 9.6,
“IBM Storage Tier Advisor Tool” on page 433.
9.5 Easy Tier configuration using the CLI
In 9.4, “Easy Tier configuration using the GUI” on page 419 the process that is used to enable
IBM Storwize V3700 Easy Tier by using the GUI is described. Easy Tier can also be
configured by using the CLI. For the advanced user, this method offers several more options
for Easy Tier configuration.
Log file creation: Depending on your workload and configuration, it can take up to 24
hours until a new Easy Tier log file is created.

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Before the CLI is used, you must configure CLI access, as described in Appendix A,
“Command-line interface setup and SAN Boot” on page 593.
9.5.1 Enabling Easy Tier evaluation mode
If you want to enable Easy Tier in evaluation mode, you must enable Easy Tier on a
single-tiered storage pool. Connect to your IBM Storwize V3700 by using the CLI and run the
lsmdiskgrp command, as shown in Example 9-1. This command shows an overview about all
configured storage pools and the Easy Tier status of the pool. In our example, there are two
storage pools listed: mdiskgrp0 with Easy Tier inactive, and Multi_Tier_Pool with Easy Tier
enabled.
Example 9-1 List storage pools
IBM_2072:admin>lsmdiskgrp
id name status mdisk_count ... easy_tier easy_tier_status
0 mdiskgrp0 online 3 ... auto inactive
1 Multi_Tier_Pool online 3 ... auto active
For a more detailed view of the single-tiered storage pool, run lsmdiskgrp storage pool
name, as shown in Example 9-2.
Example 9-2 Storage Pools details - Easy Tier inactive
IBM_2072:admin>lsmdiskgrp mdiskgrp0
id 0
name mdiskgrp0
status online
mdisk_count 3
...
easy_tier auto
easy_tier_status inactive
tier generic_ssd
tier_mdisk_count 0
...
tier generic_hdd
tier_mdisk_count 3
...
To enable Easy Tier on a single-tiered storage pool, run chmdiskgrp -easytier on storage
pool name, as shown in Example 9-3. Because this storage pool does not have any SSD
MDisks, it is not a multitiered storage pool; only measuring is available.
Example 9-3 Enable Easy Tier on a single-tiered storage pool
IBM_2072:admin>chmdiskgrp -easytier on mdiskgrp0
IBM_2072:admin>
Readability: In most examples shown in this section, many lines were deleted in the
command output or responses so that we can concentrate on the Easy Tier related
information only.

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Check the status of the storage pool again by running lsmdiskgrp storage pool name again,
as shown in Example 9-4.
Example 9-4 Storage pool details: Easy Tier ON
IBM_2072:admin>lsmdiskgrp mdiskgrp0
id 0
name mdiskgrp0
status online
mdisk_count 3
vdisk_count 7
...
easy_tier on
easy_tier_status active
tier generic_ssd
tier_mdisk_count 0
...
tier generic_hdd
tier_mdisk_count 3
...
Run the svcinfo lsmdiskgrp command again (as shown in Example 9-5) and you see that
Easy Tier is turned on the storage pool now, but that Automatic Data Placement Mode is not
active on the multitiered storage pool.
Example 9-5 Storage pool list
IBM_2072:admin>lsmdiskgrp
id name status mdisk_count vdisk_count ... easy_tier easy_tier_status
0 mdiskgrp0 online 3 7 ...on active
1 Multi_Tier_Pool online 3 0 ...auto active
To get the list of all the volumes that are defined, run the lsvdisk command, as shown in
Example 9-6. For this example, we are only interested in the redhat1 volume.
Example 9-6 All volumes list
IBM_2072:admin>lsvdisk
id name IO_group_id IO_group_name status mdisk_grp_id
5 redhat1 0 io_grp0 online many many
...
To get a more detailed view of a volume, run the lsvdisk volume name command, as shown in
Example 9-7. This output shows two copies of a volume. Copy 0 is in a multitiered storage
pool and Automatic Data Placement is active, Copy 1 is in the single-tiered storage pool, and
Easy Tier evaluation mode is active, as indicated by the easy_tier_status measured line.
Example 9-7 Volume details
IBM_2072:admin>lsvdisk redhat1
id 5
name redhat1
IO_group_id 0
IO_group_name io_grp0
status online
mdisk_grp_id many
mdisk_grp_name many

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capacity 10.00GB
...
copy_id 0
status online
sync yes
primary yes
mdisk_grp_id 1
mdisk_grp_name Multi_Tier_Pool
...
easy_tier on
easy_tier_status active
tier generic_ssd
tier_capacity 0.00MB
tier generic_hdd
tier_capacity 10.00GB
...
copy_id 1
status online
sync yes
primary no
mdisk_grp_id 0
mdisk_grp_name mdiskgrp0
....
easy_tier on
easy_tier_status measured
tier generic_ssd
tier_capacity 0.00MB
tier generic_hdd
tier_capacity 10.00GB
...
These changes are also reflected in the GUI, as shown in Figure 9-23 on page 431. Select
the Show Details option to view the details of the Easy Tier for each of the volume copies.

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Figure 9-23 Easy Tier status by volume
Easy Tier evaluation mode is now active on the single-tiered storage pool (mdiskgrp0), but
only for measurement. For more information about downloading the I/O statistics and
analyzing them, see 9.4.2, “Downloading Easy Tier I/O measurements” on page 426.
9.5.2 Enabling or disabling Easy Tier on single volumes
If you enable Easy Tier on a storage pool, by default, all volume copies inside the Easy Tier
pools also have it enabled. This setting applies both to multitiered and single-tiered storage
pools. It is also possible to turn Easy Tier on and off for single volume copies.
To disable Easy Tier on single volumes, run chvdisk -easytier off volume name, as shown
in Example 9-8.
Example 9-8 Disable Easy Tier on a single volume
IBM_2072:admin>chvdisk -easytier off redhat1
IBM_2072:admin>
This command disables Easy Tier on all copies of this volume. Example 9-9 shows that the
Easy Tier status of the copies has changed, even if Easy Tier is still enabled on the
storage pool.
Example 9-9 Easy Tier disabled
IBM_2072:admin>lsvdisk redhat1
id 5
name redhat1
IO_group_id 0
IO_group_name io_grp0

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status online
mdisk_grp_id many
mdisk_grp_name many
capacity 10.00GB
...
copy_id 0
status online
sync yes
primary yes
mdisk_grp_id 1
mdisk_grp_name Multi_Tier_Pool
...
easy_tier off
easy_tier_status meassured
tier generic_ssd
tier_capacity 0.00MB
tier generic_hdd
tier_capacity 10.00GB
...
copy_id 1
status online
sync yes
primary no
mdisk_grp_id 0
mdisk_grp_name mdiskgrp0
....
easy_tier off
easy_tier_status measured
tier generic_ssd
tier_capacity 0.00MB
tier generic_hdd
tier_capacity 10.00GB
...
To enable Easy Tier on a volume, run the chvdisk -easytier on volume name command (as
shown in Example 9-10), and the Easy Tier Status changes back to Enabled, as shown in
Example 9-7 on page 429.
Example 9-10 Easy Tier enabled
IBM_2072:admin>chvdisk -easytier on redhat1
IBM_2072:admin>

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9.6 IBM Storage Tier Advisor Tool
The IBM Storage Tier Advisor Tool (STAT) is a Windows console tool. If you run Easy Tier in
evaluation mode, it analyzes the extents and estimates how much benefit you derive if you
implement Easy Tier Automatic Data Placement with SSD MDisks. If Automatic Data
Placement Mode is already active, the analysis also includes an overview of migrated hot
data and recommendations about whether you can derive any benefit by adding more SSD
drives. The output provides a graphical representation of the performance data collected by
Easy Tier over a 24-hour operational cycle.
9.6.1 Creating graphical reports
STAT takes input from the dpa_heat log file and produces an HTML file that contains the
report. Download the heat_log file, as described in 9.4.2, “Downloading Easy Tier I/O
measurements” on page 426, and save it to the HDD of a Windows system.
For more information about the tool and to download it, see this website:
http://www-01.ibm.com/support/docview.wss?uid=ssg1S4000935
Click Start  Run, enter cmd, and click OK to open a command prompt.
Typically, the tool is installed in the C:\Program Files\IBM\STAT directory. Enter the following
command to generate the report, as shown in Example 9-11:
C:\Program Files\IBM\STAT>STAT.exe -o c:\directory_where_you_want_the output_to_go
c:\location_of_dpa_heat_data_file
If you do not specify -o c:\directory_where_you_want_the output_to_go, the output goes to
the directory where the STAT.exe file is in.
Example 9-11 Generate HTML file
C:\EasyTier>STAT.exe -o C:\EasyTier C:\StorwizeV3700_Logs\dpa_heat.31G00KV-1.101
209.131801.data
CMUA00019I The STAT.exe command has completed.
C:\EasyTier>
Browse the directory where you directed the output file, and there is a file named index.html.
Open it with your browser to view the report.

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9.6.2 STAT reports
If you open the index.html file of an IBM Storwize V3700 system that is in Easy Tier
evaluation mode, a window opens that gives you an estimate of the benefit if you were to add
SSD drives, as shown in Figure 9-24.
Figure 9-24 STAT report: System Summary
The System Summary window provides the most important numbers. In Figure 9-24, we see
that 12 volumes were monitored with a total capacity of 6000 GB. The result of the analysis of
the hot extents is that about 160 GB (which means 2%) that should be migrated to the high
performance disk tier.
It also recommends that one SSD RAID 5 array should be added as a high performance tier
that consists of four SSD drives (3+P). This predicted performance improvement is the
possible response time reduction at the backend in a balanced system is between 64% and
84%.
Important: Because this tool was first available for SAN Volume Controller and IBM
Storwize V7000, you can ignore that it is showing IBM Storwize V7000 in the report. The
STAT tool works on all SAN Volume Controller and Storwize systems.

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Click Volume Heat Distribution to change to a more detailed view, as shown in Figure 9-25.
Figure 9-25 Volume Heat Distribution window
The table in Figure 9-25 shows how the hot extents are distributed across your system. It
contains the following information:
Volume ID: The unique ID of each volume on the IBM Storwize V3700.
Copy ID: If a volume owns more than one copy, the data is measured for each copy.
Pool ID: The unique ID of each pool configured on the IBM Storwize V3700.
Configured Size: The configured size of each volume that is represented to the host.
Capacity on SSD: Capacity of the volumes on high performance disk tier (even in
evaluation mode, volumes can be on high performance disk tiers if they were moved there
before).
Heat Distribution: Shows the heat distribution of the data in this volume. The blue portion
of the bar represents the capacity of the cold extents, and the red portion represents the
capacity of the hot extents. The red hot data is candidates to be moved to high
performance disk tier.

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9.7 Tivoli Storage Productivity Center
IBM Tivoli Storage Productivity Center provides a set of policy-driven automated tools for
managing storage capacity, availability, events, performance, and assets in your enterprise
environment. Tivoli Storage Productivity Center provides storage management from the host
and application to the target storage device. It provides disk and tape subsystem
configuration and management, performance management, SAN fabric management and
configuration, and usage reporting and monitoring. In this section, we describe how to use
Tivoli Storage Productivity Center to get usage reporting and to monitor performance data.
Tivoli Storage Productivity Center can help you to identify, evaluate, control, and predict your
enterprise storage management assets. Because it is policy-based, it can detect potential
problems and automatically make adjustments that are based on the policies and actions that
you define. For example, it can notify you when your system is running out of disk space or
warn you of impending storage hardware failure. By alerting you to these and other issues
that are related to your stored data, it enables you to prevent unnecessary system and
application downtime.
9.7.1 Features of Tivoli Storage Productivity Center
Tivoli Storage Productivity Center includes the following features:
Simplifies the management of storage infrastructures.
Manages, configures and provisions SAN-attached storage.
Monitors and tracks performance of SAN-attached devices.
Monitors and tracks performance of SAN-attached devices.
Monitors, manages, and controls (through zones) SAN fabric components.
Manages the capacity usages and availability of the file systems and databases.
Makes available Performance Monitoring and Reporting.
View reports from web-based GUI.
For more information about new features in Tivoli Storage Productivity Center 5.1, see this
website:
http://pic.dhe.ibm.com/infocenter/tivihelp/v59r1/index.jsp?topic=%2Fcom.ibm.tpc_V5
1.doc%2Ffqz0_r_whats_new_release_5.1.html
9.7.2 Adding IBM Storwize V3700 in Tivoli Storage Productivity Center
After the Tivoli Storage Productivity Center installation is complete, Tivoli Storage Productivity
Center is ready to connect to the IBM Storwize V3700 system. Complete the following steps
to set up this connection:
1.Browse to this website:
http://<TPCsystemHostname>:9550/ITSRM/app/en_US/index.html
Start Tivoli Storage Productivity Center, as shown in Figure 9-26 on page 437. You also
find a link on the website to download IBM Java, if required. To start Tivoli Storage
Productivity Center console, click TPC GUI (Java Web Start).

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Figure 9-26 Tivoli Storage Productivity Center window
2.After you start Tivoli Storage Productivity Center, it starts an application download, as
shown in Figure 9-27. During your first login, the required Java packages are installed to
your local system.
Figure 9-27 Downloading Tivoli Storage Productivity Center application
3.Use your login credentials to access Tivoli Storage Productivity Center, as shown in
Figure 9-28.
Figure 9-28 Tivoli Storage Productivity Center Login Access

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4.After successful login, you are ready to add storage devices into Tivoli Storage
Productivity Center, as shown in Figure 9-29.
Figure 9-29 Add Devices Console
5.Enter the information about your IBM Storwize V3700 in Tivoli Storage Productivity Center,
as shown in Figure 9-30.
Figure 9-30 Configure device in Tivoli Storage Productivity Center

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After you complete all of the required steps, follow the wizard. After it is completed, Tivoli
Storage Productivity Center collects information from IBM Storwize V3700. A summary of
details is shown at the end of discovery process.
9.8 Administering and reporting an IBM Storwize V3700 system
through Tivoli Storage Productivity Center
This section shows examples of how to use Tivoli Storage Productivity Center to administer,
configure and generate reports for IBM Storwize V3700 system. A detailed description about
Tivoli Storage Productivity Center reporting is beyond the intended scope of this book.
9.8.1 Basic configuration and administration
Tivoli Storage Productivity Center allows you to administer, monitor, and configure your IBM
Storwize V3700 system, but not all of the options that are normally associated with the IBM
Storwize V3700 GUI or CLI are available.
After successfully adding your IBM Storwize V3700 system, click Disk Manager  Storage
Subsystems to view your configured devices, as shown in Figure 9-31.
Figure 9-31 Storage Subsystem view
When you highlight the IBM Storwize V3700 system, action buttons become available that
allows you to view the device configuration or create virtual disks (see Figure 9-32). MDisk
Groups provides a detailed list of the configured MDisk groups including, pool space,
available space, configured space and Easy Tier Configuration. Virtual Disks lists all the
configured Volumes with the option to filter them by MDisk Group. The list includes several
attributes, such as capacity, volume type, and type.
Terms used: Tivoli Storage Productivity Center and SAN Volume Controller use the
following terms:
Virtual Disk: The equivalent of a Volume on a Storwize device
MDisk Group: The equivalent of a Storage Pool on a Storwize device.

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Figure 9-32 Action Buttons
If you click Create Virtual Disk, it opens the Create Virtual Disk wizard window, as shown in
Figure 9-33. Use this window to create volumes that specify several options (such as size,
name, thin provisioning) and add MDisks to an MDisk Group.
Figure 9-33 Virtual Disk wizard Creation

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9.8.2 Report Generation by using the GUI
In this section, we show some report generation that uses the GUI. Create a probe to collect
information from IBM Storwize V3700, as shown in Figure 9-34.
Figure 9-34 Create Probe
Add an IBM Storwize V3700 in the probe for collecting information, as shown in Figure 9-35.
Figure 9-35 Adding IBM Storwize V3700 in Probe

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After you create the probe, you can create Subsystem Performance Monitor, as shown in
Figure 9-36.
Figure 9-36 Create subsystem performance monitor
To check the Managed Disk performance, click Disk Manager  Reporting  Storage
Subsystem Performance  By Managed Disk. You see many options to include in the
wizard to check MDisk performance, as shown in Figure 9-37.
Figure 9-37 Managed disk performance report filter specification

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If you click the Generate Report option, you see a report, as shown in Figure 9-38.
Figure 9-38 MDisk performance report
Clicking the Pie chart icon creates a graphical chart view of the selected MDisk, as shown in
Figure 9-39.
Figure 9-39 MDisk history chart
9.8.3 Report Generation using Tivoli Storage Productivity Center web page
In this section, we describe how to generate reports by using Tivoli Storage Productivity
Center Web Console.
To connect to the console, enter the following URL in your browser:
https://tpchostname.com:9569/srm/
You see a login window, as shown in Figure 9-40 on page 444. Log in by using your Tivoli
Storage Productivity Center credentials.

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Figure 9-40 Tivoli Storage Productivity Center login window
After login, you see the Tivoli Storage Productivity Center web dashboard, as shown in
Figure 9-41. The Tivoli Storage Productivity Center web-based GUI is used to show
information about the storage resources in your environment. It contains predefined and
custom reports about performance and storage tiering.
Figure 9-41 Tivoli Storage Productivity Center window
You can use IBM Tivoli Common Reporting to view predefined reports and create custom
reports from the web-based GUI. We show some predefined reports, starting with the report
that is shown in Figure 9-42.
Figure 9-42 Tivoli Storage Productivity Center web-based reporting

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Figure 9-43 shows how to select predefined Storage Tiering reports.
Figure 9-43 Tivoli Storage Productivity Center Storage Tiering Reports
Figure 9-44 shows the different report options for Storage Tiering.
Figure 9-44 Details Reports
Figure 9-45 shows the output from VDisk Details Report.
Figure 9-45 VDisk Details Report

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Figure 9-46 on page 446 shows the Report Overview in a pie chart.
Figure 9-46 Reporting Overview
Figure 9-47 shows the Easy Tier usage for volumes. To open this report in Tivoli Storage
Productivity Center, click Storage Resources  Volumes.
Figure 9-47 Volume Easy Tier usage

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Figure 9-48 shows a detailed list of Storage Pools.
Figure 9-48 Pool Easy Tier information
Figure 9-49 shows Storage Virtualized Pool details in graph format.
Figure 9-49 Pool details

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© Copyright IBM Corp. 2013. All rights reserved.
449
Chapter 10.
Copy services
In this chapter, we describe the copy services functions that are provided by the IBM Storwize
V3700 storage system, including FlashCopy and Remote Copy. Copy services functions are
useful for making data copies for backup, application test, recovery, and so on. The IBM
Storwize V3700 system makes it easy to apply these functions to your environment through
its intuitive GUI.
This chapter includes the following topics:
FlashCopy
Remote Copy
Troubleshooting Remote Copy
Managing Remote Copy using the GUI
10

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10.1 FlashCopy
By using the FlashCopy function of the IBM Storwize V3700 storage system, you can create a
point-in-time copy of one or more volumes. In this section, we describe the structure of
FlashCopy and provide details about its configuration and use.
You can use FlashCopy to solve critical and challenging business needs that require the
duplication of data on your source volume. Volumes can remain online and active while you
create consistent copies of the data sets. Because the copy is performed at the block level, it
operates below the host operating system and cache and therefore is not apparent to the
host.
While the FlashCopy operation is performed, I/O to the source volume is frozen briefly to
initialize the FlashCopy bitmap and then allowed to resume. Although several FlashCopy
options require the data to be copied from the source to the target in the background (which
can take time to complete), the resulting data on the target volume copy appears to have
completed immediately. This task is accomplished through the use of a bitmap (or bit array)
that tracks changes to the data after the FlashCopy is initiated and an indirection layer, which
allows data to be read from the source volume transparently.
10.1.1 Business requirements for FlashCopy
When you are deciding if FlashCopy addresses your needs, you must adopt a combined
business and technical view of the problems you want to solve. Determine what your needs
are from a business perspective, and then determine if FlashCopy fulfills the technical needs
of those business requirements.
With an immediately available copy of the data, FlashCopy can be used in the following
business scenarios:
Rapidly creating consistent backups of dynamically changing data
FlashCopy can be used to create backups through periodic execution; the FlashCopy
target volumes can be used to complete a rapid restore of individual files or the entire
volume through Reverse FlashCopy (by using the -restore option).
The target volumes that are created by FlashCopy can also be used for backup to tape.
Attaching them to another server and performing backups from there allows the
production server to continue largely un-affected. After the copy to tape completes, the
target volumes can be discarded or kept as a rapid restore copy of the data.
Flushing: Because FlashCopy operates at the block level, which is below the host
operating system and cache, those levels do need to be flushed for consistent FlashCopy
copies.
License information: The IBM Storwize V3700 offers up to 64 FlashCopy mappings at no
charge. However, other licenses can be purchased to expand to 2,040 FlashCopy
mappings per system.

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Rapidly creating consistent copies of production data to facilitate data movement or
migration between hosts
FlashCopy can be used to facilitate the movement or migration of data between hosts
while minimizing downtime for applications. FlashCopy allows application data to be
copied from source volumes to new target volumes while applications remain online. After
the volumes are fully copied and synchronized, the application can be stopped and then
immediately started on the new server accessing the new FlashCopy target volumes. This
mode of migration is faster than other migration methods that are available through the
IBM Storwize V3700 because the size and the speed of the migration is not as limited.
Rapidly creating copies of production data sets for application development and testing
Under normal circumstances, to perform application development and testing, data must
be restored from traditional backup media, such as tape. Depending on the amount of
data and the technology in use, this process easily can take a day or more. With
FlashCopy, a copy can be created and online for use in a few minutes. The time varies
based on the application and the data set size.
Rapidly creating copies of production data sets for auditing purposes and data mining
Auditing or data mining normally require the usage of the production applications. This
situation can cause high loads for databases track inventories or similar data. With
FlashCopy, you can create copies for your reporting and data mining activities. This
feature reduces the load on your production systems, which increases their performance.
Rapidly creating copies of production data sets for quality assurance
Quality assurance is an interesting case for FlashCopy. Because traditional methods
involve so much time and labor, the refresh cycle typically is extended. This reduction in
time required allows much more frequent refreshes of the quality assurance database.
10.1.2 FlashCopy functional overview
FlashCopy occurs between a source volume and a target volume. The source and target
volumes must be the same size. Multiple FlashCopy mappings (source-to-target
relationships) can be defined, and point-in-time consistency can be maintained across
multiple point-in-time mappings by using consistency groups. For more information about
FlashCopy consistency groups, see “FlashCopy consistency groups” on page 456.
The minimum granularity that IBM Storwize V3700 storage system supports for FlashCopy is
an entire volume; it is not possible to use FlashCopy to copy only part of a volume.
Additionally, the source and target volumes must belong to the same IBM Storwize V3700
storage system, but they do not have to be in the same storage pool.
Before you start a FlashCopy (regardless of the type and options specified) the IBM Storwize
V3700 must put the cache into write-through mode flushing the I/O currently bound for the
source volume. If you are scripting FlashCopy operations from the CLI you must run the
prestartfcmap or prestartfcconsistgrp command. However, this step is managed for you
and carried out automatically by the GUI. This is not the same as flushing the host cache,
which is not required. After FlashCopy is started, an effective copy of a source volume to a
target volume is created. The content of the source volume is immediately presented on the
target volume and the original content of the target volume is lost. This FlashCopy operation
is also referred to as a
time-zero copy
(T
0
).

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Immediately following the FlashCopy operation, both the source and target volumes are
available for use. The FlashCopy operation creates a bitmap that is referenced and
maintained to direct I/O requests within the source and target relationship. This bitmap is
updated to reflect the active block locations as data is copied in the background from the
source to target and updates are made to the source.
Figure 10-1 shows the redirection of the host I/O toward the source volume and the target
volume.
Figure 10-1 Redirection of host I/O
When data is copied between volumes, it is copied in units of address space known as
grains
. Grains are units of data that are grouped together to optimize the use of the bitmap
that tracks changes to the data between the source and target volume. You have the option of
using 64 KB or 256 KB grain sizes (256 KB is the default). The FlashCopy bitmap contains
1 bit for each grain and is used to track whether the source grain was copied to the target.
The 64 KB grain size uses bitmap space at a rate of four times the default 256 KB size.
The FlashCopy bitmap dictates the following read and write behavior for the source and target
volumes:
Read I/O request to source: Reads are performed from the source volume the same as for
non-FlashCopy volumes.
Write I/O request to source: Writes to the source cause the grains of the source volume to
be copied to the target if they are not already and then the write is performed to the
source.
Read I/O request to target: Reads are performed from the target if the grains are already
copied; otherwise, the read is performed from the source.
Write I/O request to target: Writes to the target cause the grain to be copied from the
source to the target first, unless the entire grain is being written and then the write
completes to the target only.
FlashCopy mappings
A FlashCopy mapping defines the relationship between a source volume and a target volume.
FlashCopy mappings can be stand-alone mappings or a member of a consistency group, as
described in “FlashCopy consistency groups” on page 456.

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Incremental FlashCopy mappings
In an incremental FlashCopy, the initial mapping copies all of the data from the source volume
to the target volume. Subsequent FlashCopy mappings only copy data that was modified
since the initial FlashCopy mapping. This action reduces the amount of time that it takes to
re-create an independent FlashCopy image. You can define a FlashCopy mapping as
incremental only when you create the FlashCopy mapping.
Multiple target FlashCopy mappings
You can copy up to 256 target volumes from a single source volume. Each relationship
between a source and target volume is managed by a unique mapping such that a single
volume can be the source volume for up to 256 mappings.
Each of the mappings from a single source can be started and stopped independently. If
multiple mappings from the same source are active (in the copying or stopping states), a
dependency exists between these mappings.
If a single source volume has multiple target FlashCopy volumes, the write to the source
volume does not cause its data to be copied to all of the targets. Instead, it is copied to the
newest target volume only. The older targets refer to new targets first before referring to the
source. A dependency relationship exists between a particular target and all newer targets
that share a source until all data is copied to this target and all older targets.
Cascaded FlashCopy mappings
The cascaded FlashCopy function allows a FlashCopy target volume to be the source volume
of another FlashCopy mapping. Up to 256 mappings can exist in a cascade. If cascaded
mappings and multiple target mappings are used, a tree of up to 256 mappings can be
created.
Cascaded mappings differ from multiple target FlashCopy mappings in depth. Cascaded
mappings have an association in the manner of A > B > C, while multiple target FlashCopy
has an association in the manner A > B1 and A > B2.
Background copy
The background copy rate is a property of a FlashCopy mapping defined as a value of 0 -
100. The background copy rate can be defined and dynamically changed for individual
FlashCopy mappings. A value of 0 disables background copy. This option is also called the
no-copy option
, which provides pointer-based images for limited lifetime uses.
With FlashCopy background copy, the source volume data is copied to the corresponding
target volume in the FlashCopy mapping. If the background copy rate is set to 0, which means
disable the FlashCopy background copy, only data that changed on the source volume is
copied to the target volume. The benefit of the use of a FlashCopy mapping with background
copy enabled is that the target volume becomes a real independent clone of the FlashCopy
mapping source volume after the copy is complete. When the background copy is disabled,
the target volume only remains a valid copy of the source data while the FlashCopy mapping
remains in place. Copying only the changed data saves your storage capacity (assuming it is
thin provisioned and -rsize was correctly set up.)

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The relationship of the background copy rate value to the amount of data copied per second
is shown in Table 10-1.
Table 10-1 Background copy rate
Cleaning rate
The cleaning rate provides a method for FlashCopy copies with dependant mappings
(multiple target or cascaded) to complete their background copies before their source goes
offline or is deleted after a stop is issued.
When you create or modify a FlashCopy mapping, you can specify a cleaning rate for the
FlashCopy mapping that is independent of the background copy rate. The cleaning rate is
also defined as a value of 0 - 100, which has the same relationship to data copied per second
as the backup copy rate (see Table 10-1 on page 454).
The cleaning rate controls the rate at which the cleaning process operates. The cleaning
process’ purpose is to copy (or flush) data from FlashCopy source volumes upon which there
are dependent mappings. For cascaded and multiple target FlashCopy, the source maybe a
target for another FlashCopy or a source for a chain (cascade) of FlashCopy mappings. The
cleaning process must complete before the FlashCopy mapping can go to the stopped state.
This feature and the distinction between stopping and stopped states was added to prevent
data access interruption for dependent mappings, when their source is issued a stop.
FlashCopy mapping states
At any point in time, a mapping is in one of the following states:
Idle or Copied
The source and target volumes act as independent volumes even if a mapping exists
between the two. Read and write caching is enabled for both the source and the target
volumes.
Value Data copied per
second
Grains per second
(256 KB grain)
Grains per second
(64 KB grain)
1 - 10 128 KB 0.5 2
11 - 20 256 KB 1 4
21 - 30 512 KB 2 8
31 - 40 1 MB 4 16
41 - 50 2 MB 8 32
51 - 60 4 MB 16 64
61 - 70 8 MB 32 128
71 - 80 16 MB 64 256
81 - 90 32 MB 128 512
91 - 100 64 MB 256 1024
Data copy rate: The data copy rate remains the same regardless of the FlashCopy grain
size. The difference is the number of grains copied per second. The gain size can be 64 KB
or 256 KB. The smaller size uses more bitmap space and thus limits the total amount of
FlashCopy space possible, but can be more efficient regarding the amount of data moved,
depending on your environment.

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If the mapping is incremental and the background copy is complete, the mapping only
records the differences between the source and target volumes. If the connection to both
nodes in the IBM Storwize V3700 storage system that the mapping is assigned to is lost,
the source and target volumes go offline.
Copying
The copy is in progress. Read and write caching is enabled on the source and the target
volumes.
Prepared
The mapping is ready to start. The target volume is online, but is not accessible. The
target volume cannot perform read or write caching. Read and write caching is failed by
the SCSI front end as a hardware error. If the mapping is incremental and a previous
mapping has completed, the mapping only records the differences between the source
and target volumes. If the connection to both nodes in the IBM Storwize V3700 storage
system that the mapping is assigned to is lost, the source and target volumes go offline.
Preparing
The target volume is online, but not accessible. The target volume cannot perform read or
write caching. Read and write caching is failed by the SCSI front end as a hardware error.
Any changed write data for the source volume is flushed from the cache. Any read or write
data for the target volume is discarded from the cache. If the mapping is incremental and a
previous mapping has completed, the mapping records only the differences between the
source and target volumes. If the connection to both nodes in the IBM Storwize V3700
storage system that the mapping is assigned to is lost, the source and target volumes go
offline.
Stopped
The mapping is stopped because you issued a stop command or an I/O error occurred.
The target volume is offline and its data is lost. To access the target volume, you must
restart or delete the mapping. The source volume is accessible and the read and write
cache is enabled. If the mapping is incremental, the mapping is recording write operations
to the source volume. If the connection to both nodes in the IBM Storwize V3700 storage
system that the mapping is assigned to is lost, the source and target volumes go offline.
Stopping
The mapping is in the process of copying data to another mapping. If the background copy
process is complete, the target volume is online while the stopping copy process
completes. If the background copy process is not complete, data is discarded from the
target volume cache. The target volume is offline while the stopping copy process runs.
The source volume is accessible for I/O operations.
Suspended
The mapping started, but it did not complete. Access to the metadata is lost, which causes
the source and target volume to go offline. When access to the metadata is restored, the
mapping returns to the copying or stopping state and the source and target volumes return
online. The background copy process resumes.
Any data that was flushed and written to the source or target volume before the
suspension is in cache until the mapping leaves the suspended state.

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FlashCopy consistency groups
Consistency groups address the requirement to preserve point-in-time data consistency
across multiple volumes for applications having related data that spans them. For these
volumes, consistency groups maintain the integrity of the FlashCopy by ensuring that
dependent writes
(which are described in more detail in “Dependent writes” on page 456) are
run in the application’s intended sequence.
When consistency groups are used, the FlashCopy commands are issued to the FlashCopy
consistency group, which performs the operation on all FlashCopy mappings that are
contained within the consistency group.
Figure 10-2 shows a consistency group consisting of two FlashCopy mappings.
Figure 10-2 FlashCopy consistency group
Dependent writes
To show why it is crucial to use consistency groups when a data set spans multiple volumes,
consider the following typical sequence of writes for a database update transaction:
1.A write is run to update the database log, which indicates that a database update is about
to be performed.
2.A second write is run to complete the actual update to the database.
3.A third write is run to update the database log, indicating that the database update
completed successfully.
The database ensures the correct ordering of these writes by waiting for each step to
complete before starting the next step. However, if the database log (updates 1 and 3) and the
database (update 2) are on separate volumes, it is possible for the FlashCopy of the database
volume to occur before the FlashCopy of the database log. This situation can result in the
target volumes seeing writes (1) and (3) but not (2), because the FlashCopy of the database
volume occurred before the write completed.
FlashCopy mapping management: After an individual FlashCopy mapping is added to a
consistency group, it can only be managed as part of the group; operations such as start
and stop are no longer allowed on the individual mapping.

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In this case, if the database was restarted by using the backup that was made from the
FlashCopy target volumes, the database log indicates that the transaction completed
successfully when, in fact, it had not. This situation occurs because the FlashCopy of the
volume with the database file was started (bitmap was created) before the write had
completed to the volume. Therefore, the transaction is lost and the integrity of the database is
in question.
To overcome the issue of dependent writes across volumes and to create a consistent image
of the client data, it is necessary to perform a FlashCopy operation on multiple volumes as an
atomic operation using consistency groups.
A FlashCopy consistency group can contain up to 512 FlashCopy mappings. The more
mappings you have, the more time it takes to prepare the consistency group. FlashCopy
commands can then be issued to the FlashCopy consistency group and simultaneously for all
of the FlashCopy mappings that are defined in the consistency group. For example, when
starting the FlashCopy for the consistency group, all FlashCopy mappings in the consistency
group are started at the same time, resulting in a point-in-time copy that is consistent across
all FlashCopy mappings that are contained in the consistency group.
A consistency group aggregates FlashCopy mappings, not volumes. Thus, where a source
volume has multiple FlashCopy mappings, they can be in the same or separate consistency
groups. If a particular volume is the source volume for multiple FlashCopy mappings, you
might want to create separate consistency groups to separate each mapping of the same
source volume. Regardless of whether the source volume with multiple target volumes is in
the same consistency group or in separate consistency groups, the resulting FlashCopy
produces multiple identical copies of the source data.
The consistency group can be specified when the mapping is created. You can also add the
FlashCopy mapping to a consistency group or change the consistency group of a FlashCopy
mapping later.
FlashCopy consistency group states
At any point, a FlashCopy consistency group is in one of the following states:
Idle or Copied
All FlashCopy Mappings in this consistency group are in the Idle or Copied state.
Preparing
At least one FlashCopy mapping in this consistency group is in the Preparing state.
Prepared
The consistency group is ready to start. While in this state, the target volumes of all
FlashCopy mappings in this consistency group are not accessible.
Copying
At least one FlashCopy mapping in the consistency group is in the Copying state and no
FlashCopy mappings are in the Suspended state.
Stopping
At least one FlashCopy mapping in the consistency group is in the Stopping state and no
FlashCopy mappings are in the Copying or Suspended state.
Important: Do not place stand-alone mappings into a consistency group because they
become controlled as part of that consistency group.

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Stopped
The consistency group is stopped because you issued a command or an I/O error
occurred.
Suspended
At least one FlashCopy mapping in the consistency group is in the Suspended state.
Empty
The consistency group does not have any FlashCopy mappings.
Reverse FlashCopy
Reverse FlashCopy enables FlashCopy targets to become restore points for the source
without breaking the FlashCopy relationship and without waiting for the original copy
operation to complete. It supports multiple targets and multiple rollback points.
A key advantage of Reverse FlashCopy is that it does not delete the original target, thus
allowing processes that use the target, such as a tape backup, to continue uninterrupted.
You can also create an optional copy of the source volume that is made before you start the
reverse copy operation. This copy restores the original source data, which can be useful for
diagnostic purposes.
Figure 10-3 shows an example of the reverse FlashCopy scenario.
Figure 10-3 Reverse FlashCopy scenario

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To restore from a FlashCopy backup by using the GUI, complete the following steps:
1.(Optional) Create a target volume (volume Z) and run FlashCopy on the production
volume (volume X) to copy data on to the new target for later problem analysis.
2.Create a FlashCopy map with the backup to be restored (volume Y) or (volume W) as the
source volume and volume X as the target volume.
3.Start the FlashCopy map (volume Y  volume X).
Regardless of whether the initial FlashCopy map (volume X to volume Y) is incremental, the
Reverse FlashCopy operation only copies the modified data.
Consistency groups are reversed by creating a set of new “reverse” FlashCopy maps and
adding them to a new “reverse” consistency group. Consistency groups cannot contain more
than one FlashCopy map with the same target volume. For more information about restoring
from a FlashCopy, see “Restoring from a FlashCopy” on page 484.
10.1.3 Planning for FlashCopy
There are several items that must be considered before a FlashCopy is performed, which we
describe in this section.
Guidelines for FlashCopy implementation
Consider the following guidelines for FlashCopy implementation:
The source and target volumes must be on the same IBM Storwize V3700 storage
system.
The source and target volumes do not need to be in the same storage pool.
The FlashCopy source and target volumes can be thin-provisioned.
The source and target volumes must be the same size. The size of the source and target
volumes cannot be altered (increased or decreased) while a FlashCopy mapping is
defined.
FlashCopy operations perform in direct proportion to the performance of the source and
target disks. If you have a fast source disk and slow target disk, the performance of the
source disk is reduced because it must wait for the write operation to occur at the target
before it can write to the source.
Maximum configurations for FlashCopy
Table 10-2 shows some of the FlashCopy maximum configurations. For more information
about the latest values, see the IBM Storwize V3700 Information Center at this website:
http://www.ibm.com/support/docview.wss?rs=591&uid=ssg1S1004380
Table 10-2 FlashCopy maximum configurations
The -restore option: In the CLI, you must add the -restore option to the command
svctask startfcmap manually. For more information about the use of the CLI, see
Appendix A, “Command-line interface setup and SAN Boot” on page 593.
FlashCopy property Maximum
FlashCopy targets per source 256
FlashCopy mappings per cluster 4,096

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FlashCopy presets
The IBM Storwize V3700 storage system provides three FlashCopy presets, named
Snapshot, Clone, and Backup, to simplify the more common FlashCopy operations
(Table 10-3).
Table 10-3 FlashCopy presets
10.1.4 Managing FlashCopy by using the GUI
The IBM Storwize V3700 storage system provides a separate function icon to access copy
service management. The following windows are available for managing FlashCopy under the
Copy Services function icon:
FlashCopy
Consistency Groups
FlashCopy Mappings
FlashCopy consistency groups per
cluster
127
FlashCopy mappings per
consistency group
512
Preset Purpose
Snapshot Creates a point-in-time view of the production data. The snapshot is not
intended to be an independent copy, but is used to maintain a view of the
production data at the time the snapshot is created.
This preset automatically creates a thin-provisioned target volume with
0% of the capacity allocated at the time of creation. The preset uses a
FlashCopy mapping with 0% background copy so that only data written
to the source or target is copied to the target volume.
Clone Creates an exact replica of the volume, which can be changed without
affecting the original volume. After the copy operation completes, the
mapping that was created by the preset is automatically deleted.
This preset automatically creates a volume with the same properties as
the source volume and creates a FlashCopy mapping with a background
copy rate of 50. The FlashCopy mapping is configured to automatically
delete itself when the FlashCopy mapping reaches 100% completion.
Backup Creates a point-in-time replica of the production data. After the copy
completes, the backup view can be refreshed from the production data,
with minimal copying of data from the production volume to the backup
volume.
This preset automatically creates a volume with the same properties as
the source volume. The preset creates an incremental FlashCopy
mapping with a background copy rate of 50.
Presets: All of the presets can be adjusted by using the Advanced Settings expandable
section in the GUI.
FlashCopy property Maximum

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The Copy Services function icon is shown in Figure 10-4.
Figure 10-4 Copy services function icon
Most of the actions to manage the FlashCopy mapping can be done in the FlashCopy window
or the FlashCopy Mappings windows, although the quick path to create FlashCopy presets
can only be found in the FlashCopy window.

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Click FlashCopy in the Copy Services function icon menu and the FlashCopy window opens,
as shown in Figure 10-5. In the FlashCopy window, the FlashCopy mappings are organized
by volumes.
Figure 10-5 FlashCopy window
Click FlashCopy Mappings in the Copy Services function icon menu and the FlashCopy
Mappings window opens, as shown in Figure 10-6. In the FlashCopy Mappings window, the
FlashCopy mappings are listed individually.
Figure 10-6 FlashCopy Mappings window

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The Consistency Groups window is used to manage the consistency groups for FlashCopy
mappings. Click Consistency Groups in the Copy Services function icon menu and the
Consistency Groups window opens, as shown in Figure 10-7.
Figure 10-7 Consistency Groups window
Quick path to create FlashCopy presets
It is easy to create a FlashCopy by using the presets in the FlashCopy window.
Creating a snapshot
In the FlashCopy window, choose a volume and click New Snapshot from the Actions
drop-down menu, as shown in Figure 10-8. Alternatively, highlight your chosen volume and
right-click to access the Actions menu.
Figure 10-8 Create a snapshot using the preset

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You now have a snapshot volume for the volume that you selected.
Creating a clone
In the FlashCopy window, choose a volume and click New Clone from the Actions drop-down
menu, as shown in Figure 10-9. Alternatively, highlight your chosen volume and right-click to
access the Actions menu.
Figure 10-9 Create a clone from the preset
You now have a clone volume for the volume that you selected.

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Creating a backup
In the FlashCopy window, choose a volume and click New Backup from the Actions
drop-down menu, as shown in Figure 10-10. Alternatively, highlight your chosen volume and
right-click to access the Actions menu.
Figure 10-10 Create a backup from the preset
You now have a backup volume for the volume that you selected.
You can monitor the progress of the running FlashCopy operations in the FlashCopy window
and in the FlashCopy Mappings window, as shown in Figure 10-11. The progress bars for
each target volume indicate the copy progress in percentage. The copy progress remains 0%
for snapshots; there is no change until data is written to the target volume. The copy
progresses for clone and backup keep increasing until the copy process completes.
Figure 10-11 FlashCopy in progress viewed for the FlashCopy Mappings window

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The copy progress can be also found under the Running Tasks status indicator, as shown in
Figure 10-12.
Figure 10-12 Running tasks bar: FlashCopy operations
This view is slightly different than that of the FlashCopy and FlashCopy Mappings windows,
as shown in Figure 10-13.
Figure 10-13 FlashCopy operations shown through Running Tasks
After the copy processes complete, you find the FlashCopy mapping with the clone preset
(FlashVol2 in our example) is deleted automatically, as shown in Figure 10-14 on page 467.
There are now two identical volumes completely independent of each other.

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Figure 10-14 FlashCopy progresses complete
10.1.5 Managing FlashCopy mappings
The FlashCopy presets cover the most used FlashCopy configurations for general situations.
However, customized FlashCopy mappings are still necessary in some complicated
scenarios.
Creating FlashCopy mappings
You can create FlashCopy mappings through the FlashCopy window. Select the volume you
want to be the source volume for the FlashCopy mapping and click Advanced FlashCopy...
from the Actions drop-down menu, as shown in Figure 10-15 on page 468. Alternatively,
select the volume and right-click.

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Figure 10-15 Create advanced FlashCopy
You have the option to create target volumes as part of the mapping process or use existing
target volumes. We describe creating new volumes next. For more information about use
existing volumes, see “Using existing target volumes” on page 473.
Creating target volumes
Complete the following steps to create target volumes:
1.Click Create new target volumes if you have not created the target volume yet.
After you click Create new target volumes, the wizard guides you to choose a preset., as
shown in Figure 10-16. Choose one preset that has the most similar configuration to the
one required and click Advanced Settings to make any appropriate adjustments to the
advanced settings. Figure 10-17 on page 469 shows the default advanced settings for the
snapshot preset.
Figure 10-16 Choose a preset most similar to your requirement

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Figure 10-17 Default setting for the snapshot preset
The following default advanced settings are available:
– Background Copy: 0
– Incremental: No
– Auto Delete after completion: No
– Cleaning Rate: 0

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Figure 10-18 shows the Advanced Settings for the Clone Preset.
Figure 10-18 Default settings for the clone preset
The following advanced settings are available:
– Background Copy: 50
– Incremental: No
– Auto Delete after completion: Yes
– Cleaning Rate: 50

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Figure 10-19 shows the Advanced Settings for the Backup preset.
Figure 10-19 Default settings for the backup preset
The following advanced settings are available:
– Background Copy: 50
– Incremental: Yes
– Auto Delete after completion: No
– Cleaning Rate: 50
Change the settings of the FlashCopy mapping according to your requirements and click
Next.
2.You have the option to add your FlashCopy mapping to a consistency group, as shown in
Figure 10-20 on page 471. If the consistency group is not ready, the FlashCopy mapping
can be added to the consistency group afterward. Click Next to continue.
Figure 10-20 Add FlashCopy mapping to a consistency group

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You can choose from which storage pool you want to create your target volume. As shown
in Figure 10-21, you can select the same storage pool that is used by the source volume
or a different one. Click Next to continue.
Figure 10-21 Choose use the same storage pool with the source volume
Next you have the option to define how the new target volumes manage capacity. Create a
generic volume is your default choice if you selected Clone or Backup as your basic
preset. If you select a thin-provisioned volume, you see more options, as shown in
Figure 10-22 on page 472.
Figure 10-22 Create a thin provisioned target volume
3.Click Finish and a task runs to create the mappings and volume, as shown in
Figure 10-23 on page 473. Close this window to see the FlashCopy mapping that was
created on your volume with a new target, as shown in Figure 10-24 on page 473. The
status of the created FlashCopy mapping is Idle; it can be started, as described in
“Starting a FlashCopy mapping” on page 476.

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Figure 10-23 Advanced FlashCopy create task complete
Figure 10-24 New FlashCopy mapping has been created with a new target
Using existing target volumes
Complete the following steps to use the existing target volumes:
1.In the Advanced FlashCopy menu, if you already have candidate target volumes, select
Use Existing Target Volumes, as shown in Figure 10-25 on page 474.

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Figure 10-25 Create FlashCopy mapping using existing target volume
2.You now must choose the target volume for the source volume you selected. Select the
target volume in the drop-down menu in the right pane of the window and click Add, as
shown in Figure 10-26.
Figure 10-26 Select the target volume
3.The FlashCopy mapping is now listed, as shown in Figure 10-27 on page 475. Click the
red X if the FlashCopy mapping is not the one you want to create. If the FlashCopy
mapping is what you want, click Next to continue.

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Figure 10-27 Add FlashCopy mapping
4.Select the preset and, if necessary, adjust the settings by using Advanced Settings, as
shown in Figure 10-28. For more information about the advanced settings, see “Creating
target volumes” on page 468. Make sure that the settings meet your requirements and
click Next.
Figure 10-28 Select a preset and make your adjustments

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5.Now you can add the FlashCopy mapping to a consistency group if necessary, as shown
in Figure 10-29. Select Yes to see a drop-down menu from which you can select a
consistency group. Click Finish and the FlashCopy mapping is created with the Idle
status, as shown in Figure 10-24.
Figure 10-29 Select a consistency group to add the FlashCopy mapping to
New FlashCopy Mappings
You can also create FlashCopy mappings in the FlashCopy Mappings window by clicking
New FlashCopy Mapping at the upper left, as shown in Figure 10-30.
Figure 10-30 Create a FlashCopy mapping in the FlashCopy Mappings window
A wizard opens to guide you through the creation of a FlashCopy mapping. The steps are the
same as creating an Advanced FlashCopy mapping by using Existing Target Volumes, as
described in “Using existing target volumes” on page 473.
Starting a FlashCopy mapping
Most of the FlashCopy mapping actions are available in the FlashCopy window or the
FlashCopy Mapping window. For the actions that are available in both windows, we show in
the following sections the steps in the FlashCopy window, although the steps are the same if
you were to use the FlashCopy Mapping window.

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You can start the mapping by selecting the FlashCopy target volume in the FlashCopy
window and selecting the Start option from the Actions drop-down menu (see Figure 10-31)
or by selecting the volume and right-clicking. The status of the FlashCopy mapping changes
from Idle to Copying.
Figure 10-31 Start FlashCopy mapping
Stopping a FlashCopy mapping
The FlashCopy mapping can be stopped by selecting the FlashCopy target volume in the
FlashCopy window and clicking the Stop option from the Actions drop-down menu, as shown
in Figure 10-32 on page 478. After the stopping process completes, the status of the
FlashCopy mapping is changed to Stopped.

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Figure 10-32 Stopping a FlashCopy mapping
Renaming the target volume
If the FlashCopy target volumes were created automatically by IBM Storwize V3700 storage
system, the name of the target volumes is the source volume name plus a suffix that contains
numbers. The name of the target volumes can be changed to be more meaningful in your
environment.
To change the name of the target volume, select the FlashCopy target volume in the
FlashCopy window and click Rename Target Volume from the Actions drop-down menu (see
Figure 10-33) or right-click the selected volume.
Figure 10-33 Rename a target volume

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Enter your new name for the target volume, as shown in Figure 10-34. Click Rename to
finish.
Figure 10-34 Rename a target volume
Renaming a FlashCopy mapping
The FlashCopy mappings are created with names that begin with fcmap. The name of
FlashCopy mappings can be changed to be more meaningful to you.
To change the name of a FlashCopy mapping, select the FlashCopy mapping in the
FlashCopy Mappings window and click the Rename Mapping option from the Actions
drop-down menu, as shown in Figure 10-35.
Figure 10-35 Rename a FlashCopy mapping
You must enter your new name for the FlashCopy mapping, as shown in Figure 10-36 on
page 480. Click Rename to finish.

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Figure 10-36 Enter a new name for the FlashCopy mapping
Deleting a FlashCopy mapping
The FlashCopy mapping can be deleted by selecting the FlashCopy target volume in the
FlashCopy window and clicking the Delete Mapping option from the Actions drop-down
menu (see Figure 10-37) or by right-clicking the selected volume.
Figure 10-37 Select Delete Mapping
FlashCopy Mapping state: If the FlashCopy mapping is in the Copying state, it must be
stopped before it is deleted.

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You must confirm your action to delete FlashCopy mappings in the window that opens, as
shown in Figure 10-38. Verify the number of FlashCopy mappings that you must delete. If you
want to delete the FlashCopy mappings while the data on the target volume is inconsistent
with the source volume, select the option to do so. Click Delete and your FlashCopy mapping
is removed.
Figure 10-38 Confirm the deletion of FlashCopy mappings
Showing Related Volumes
You can show the FlashCopy mapping dependencies by selecting a target or source volume
in the FlashCopy window and clicking the Show Related Volumes option from the Actions
drop-down menu (see Figure 10-39 on page 481) or right-clicking the selected volume.
Figure 10-39 Show Related Volumes menu
Deleting FlashCopy mapping: Deleting the FlashCopy mapping does not delete the
target volume. If you must reclaim the storage space that is occupied by the target volume,
you must delete the target volume manually.

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The FlashCopy mapping dependency tree opens, as shown in Figure 10-40.
Figure 10-40 FlashCopy mapping dependency
Clicking either volume shows the properties of the volume, as shown in Figure 10-41.
Figure 10-41 Target FlashCopy Volume details
Editing properties
The background copy rate and cleaning rate can be changed after the FlashCopy mapping is
created by selecting the FlashCopy target mapping in the FlashCopy window and clicking the
Edit Properties option from the Actions drop-down menu (as shown in Figure 10-42 on
page 483) or by right-clicking.

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Figure 10-42 Edit Properties menu
You can then modify the value of the background copy rate and cleaning rate by moving the
pointers on the bars, as shown in Figure 10-43. Click Save to save changes.
Figure 10-43 Change the copy rate

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Restoring from a FlashCopy
Complete the following steps to manipulate FlashCopy target volumes to restore a source
volume to a previously known state:
1.Identify the FlashCopy relationship that you want to restore. In our example, we want to
restore FlashVol1, shown in Figure 10-44.
Figure 10-44 Starting FlashCopy restore

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2.Create a mapping by using the target volume of the mapping to be restored. In our case, it
is FlashVol1_01, as shown in Figure 10-45. Select Advanced FlashCopy  Use
Existing Target Volumes.
Figure 10-45 Create new reverse mapping
3.The Source Volume is preselected with the target volume that we selected in the previous
step. Select the Target Volume from the drop-down menu. Select the source volume that
you want to restore. In our case, it is FlashVol1, as shown in Figure 10-46.
Figure 10-46 Select Target Volume

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4.Click Add. As shown in Figure 10-47, a warning appears because we are using a source
as a target. Click Close.
Figure 10-47 Flash restore warning
5.Click Next and you see a Snapshot preset choice, as shown in Figure 10-48.
Figure 10-48 Choose snapshot preset.
Select Snapshot and click Next

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6.In the next window, the question is asked if the new mapping is to be part of a consistency
group, as shown in Figure 10-49. In our example the new mapping is not part of the
consistency group, so we click No and then Finish to create the mapping.
Figure 10-49 Add new mapping to consistency group
7.The reverse mapping is created and is shown in the Idle state, as shown in Figure 10-50.
Figure 10-50 New reverse mapping

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8.To restore the original source volume FlashVol1 with the snapshot we took FlashVol1_01,
we select the new mapping and right-click for the Actions menu, as shown in Figure 10-51.
Figure 10-51 Starting the reverse mapping
9.Clicking Start results in FlashVol1 being over written with the original bitmap data that was
saved in the FlashCopy FlashVol01_01. The command completes, as shown in
Figure 10-52.
Figure 10-52 Restore command
Important: The underlying command that is run by the IBM Storwize V3700 appends the
-restore option automatically.

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10.The reverse mapping now shows as 100% copied, as shown in Figure 10-53.
Figure 10-53 Source volume restore complete
10.1.6 Managing a FlashCopy consistency group
FlashCopy consistency groups can be managed by clicking the Consistency Groups menu
that is under the Copy Services function icon, as shown in Figure 10-54.
Figure 10-54 Access to the Consistency Groups window

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The Consistency Groups window (see Figure 10-55) is where you can manage consistency
groups and FlashCopy mappings.
Figure 10-55 Consistency Groups window
In the left pane of the Consistency Groups window, you can list the consistency groups you
need. Click Not in a Group, and then expand your selection by clicking the plus icon (+) next
to it. All the FlashCopy mappings that are not in any consistency groups are shown.
In the lower pane of the Consistency Groups window, you can see the properties of a
consistency group and the FlashCopy mappings in it. You can also work with any consistency
groups and FlashCopy mappings within the Consistency Groups window, as allowed by their
state. All the actions that are allowed for the FlashCopy mapping are described in 10.1.5,
“Managing FlashCopy mappings” on page 467.
Creating a FlashCopy consistency group
To create a FlashCopy consistency group, click New Consistency Group at the top of the
Consistency Groups window, as shown in Figure 10-56.
Figure 10-56 New Consistency Group option

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You are prompted to enter the name of the new consistency group, as shown in Figure 10-57.
Following your naming conventions, enter the name of the new consistency group in the field
and click Create.
Figure 10-57 Enter the name for the consistency group
After the creation process completes, you find a new consistency group, as shown in
Figure 10-58.
Figure 10-58 New consistency group
You can rename the Consistency Group by highlighting it and right-clicking or by using the
Actions drop-down menu. Select Rename and enter the new name, as shown in
Figure 10-59. Next to the name of the consistency group, the state shows that it is now an
empty consistency group with no FlashCopy mapping in it.
Figure 10-59 Renaming a consistency group

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Adding FlashCopy mappings to a consistency group
Click Not in a Group to list all the FlashCopy mappings with no Consistency Group. You can
add FlashCopy mappings to a Consistency Group by selecting them and clicking the Move to
Consistency Group option from the Actions drop-down menu, as shown in Figure 10-60.
Figure 10-60 Select the FlashCopy mappings to add to a consistency group
Selections of a range are performed by highlighting a mapping, pressing and holding the Shift
key, and clicking the last item in the range. Multiple selections can be made by pressing and
holding the Ctrl key and clicking each mapping individually. The option is also available by
right-clicking individual mappings.
You are prompted to specify which consistency group you want to move the FlashCopy
mapping into, as shown in Figure 10-61. Choose from the list in the drop-down menu. Click
Move to Consistency Group to continue.
Figure 10-61 Select consistency group
After the action completes, you find that the FlashCopy mappings you selected are removed
from the Not In a Group list to the consistency group you chose.
Important: You cannot move mappings that are in the process of copying. Selecting a
snapshot that is already running makes the Move to Consistency Group option unavailable.

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Starting a consistency group
To start a consistency group, highlight the required group and click Start from the Actions
drop-down menu or right-click the consistency group, as shown in Figure 10-62.
Figure 10-62 Start a consistency group
After you start the consistency group, all the FlashCopy mappings in the consistency group
start at the same point. The state of the consistency group and all the underlying mappings
changes to Copying, as shown in Figure 10-63.
Figure 10-63 Consistency group start completes

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Stopping a consistency group
The consistency group can be stopped by selecting Stop from the Actions drop-down menu
or right-clicking, as shown in Figure 10-64.
Figure 10-64 Stop a consistency group
After the stop process completes, the FlashCopy mappings in the consistency group are in
the Stopped state, and a red X icon appears on the function icon of this consistency group to
indicate an alert, as shown in Figure 10-65.
Figure 10-65 Consistency group stop completes
Previously copied relationships that were added to a consistency group that was later
stopped before all members of the consistency group completed synchronization do not go
out of the Copied state.

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Removing FlashCopy mappings from a consistency group
FlashCopy mappings can be removed from a consistency group by selecting the FlashCopy
mappings and clicking Remove from Consistency Group from the Actions drop-down menu
of the FlashCopy mapping or right-clicking, as shown in Figure 10-66.
Figure 10-66 Remove from consistency group
The FlashCopy mappings are returned to the Not in a Group list after being removed from the
consistency group.
Deleting a consistency group
A consistency group can be deleted by clicking Delete from the Actions drop-down menu or
right-clicking the selected group, as shown in Figure 10-67.
Figure 10-67 Delete a consistency group

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Restoring from a FlashCopy Consistency Group
Complete the following steps to manipulate FlashCopy mappings that are captured as part of
a consistency group to restore the source volumes of those mappings to the state they were
all in at the time the FlashCopy was taken:
1.To restore a consistency group from a FlashCopy, we must create a reverse mapping of all
the individual volumes contained within the original consistency group. In our example, we
have two FlashCopy mappings (fcmap1 and fcmap4) in a consistency group known as
FlashTestGroup, as shown in Figure 10-68.
Figure 10-68 Creating FlashCopy reverse mapping
2.Click New Consistency Group in the upper left corner (as shown in Figure 10-68) and
create a consistency group. We created one that is called RedBookTest.
3.Follow the procedure that is described in “Restoring from a FlashCopy” on page 484 to
create reverse mappings for each of the mappings that exist in the source consistency
group (FlashTestGroup). When you are prompted to add to a consistency group as shown
in Figure 10-49 on page 487, select Yes and from the drop-down menu, select the new
“reverse” consistency group you created in step 2 (in our case, RedBookTest). The result
is similar to that shown in Figure 10-69.
Figure 10-69 Reverse Consistency group populated

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4.To restore the consistency group, highlight the reverse consistency group and click Start,
as shown in Figure 10-70.
Figure 10-70 Starting Consistency group restore
5.Clicking Start results in FlashVol1 and FlashVol5 being over written with the original
bitmap data that was saved in the FlashTestGroup FlashCopy consistency group mapping.
The command completes as shown in Figure 10-71.
Figure 10-71 Consistency Group restore command

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6.Clicking Close returns to the Consistency Group window. The reverse consistency group
now shows as a 100% copied and all volumes in the original FlashTestGroup were
restored, as shown in Figure 10-72.
Figure 10-72 Consistency Group restored
10.2 Remote Copy
In this section, we describe how the Remote Copy function works in IBM Storwize V3700. We
also provide the implementation steps by using the GUI for Remote Copy configuration and
management.
Remote Copy consists of the following methods for copying:
Metro Mirror: Designed for metropolitan distances with a synchronous copy requirement.
Global Mirror: Designed for longer distances without requiring the hosts to wait for the full
round-trip delay of the long-distance link through asynchronous methodology.
Global Mirror with Change Volumes: An added piece of functionality for Global Mirror that
is designed to attain consistency on lower-quality network links.
Metro Mirror and Global Mirror are IBM branded terms for the functions Synchronous Remote
Copy and Asynchronous Remote Copy. Throughout this book, the term
Remote Copy
is used
to refer to both functions where the text applies to each term equally.
10.2.1 Remote Copy license consideration
The license settings only apply to the system on which you are configuring licenses. For
remote-copy partnerships, a license is also required on any remote systems that are in the
partnership.
If a license is not purchased and activated before the trial period (90 days) expires, the
system automatically suspends any configuration that is associated with the function. You can
manually remove any configuration that is related to this function or select Monitoring 
Events in the management GUI. You can run the fix procedure that is related to the event that
is generated when the trial license period expires.
Important: The IBM Storwize V3700 automatically appends the -restore option to the
command.

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10.2.2 Remote Copy concepts
In this section, we describe Remote Copy concepts.
Partnership
When a partnership is created, we connect two separate IBM Storwize V3700 systems or an
IBM SAN Volume Controller, Storwize V3700, or Storwize V7000 and an IBM Storwize
V3700. After the partnership creation is configured on both systems, further communication
between the node canisters in each of the storage systems is established and maintained by
the SAN network. All inter-cluster communication goes through the Fibre Channel network.
Partnership must be defined on both IBM Storwize V3700 or on the IBM Storwize V3700 and
the other IBM SAN Volume Controller, Storwize V3700, or Storwize V7000 storage system to
make the partnership fully functional.
Introduction to layers
IBM Storwize V3700 implements the concept of
layers
. Layers determine how the IBM
Storwize portfolio interacts with the IBM SAN Volume Controller. Currently, the following
layers are available: replication and storage.
The replication layer is used when you want to use the IBM Storwize V3700 with one or more
IBM SAN Volume Controllers as a Remote Copy partner. The storage layer is the default
mode of operation for the IBM Storwize V3700, and is used when you want to use the IBM
Storwize V3700 to present storage to an IBM SAN Volume Controller.
The layer for the IBM Storwize V3700 can be switched by running the svctask chsystem
-layer replication command. Generally, switch the layer while your IBM Storwize V3700
system is not in production. This situation prevents potential disruptions because layer
changes are not I/O-tolerant.
Figure 10-73 shows the effect of layers on IBM SAN Volume Controller and IBM Storwize
V3700 partnerships.
Figure 10-73 IBM Storwize V3700 virtualization layers
Interconnection: Interconnects between IBM Storwize products were introduced in
Version 6.3.0. Because IBM Storwize V3700 supports only version 7.10 or higher, there is
no problem with support for this functionality. However, any other Storwize product must be
at a minimum level of 6.3.0 to connect to the IBM Storwize V3700 and the IBM Storwize
V3700 must set the replication layer by using the svctask chsystem -layer replication
limitations that are described in “Introduction to layers” on page 499.

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The replication layer allows an IBM Storwize V3700 system to be a Remote Copy partner with
an IBM SAN Volume Controller, while the storage layer allows an IBM Storwize V3700 system
to function as back-end storage for an IBM SAN Volume Controller. An IBM Storwize V3700
system cannot be in both layers at the same time.
Limitations on the SAN Volume Controller and Storwize V3700
partnership
IBM SAN Volume Controller and IBM Storwize V3700 systems can be partners in a Remote
Copy partnership. However, the following limitations affect that partnership:
The layer for the V3700 must be set to replication. The default is storage.
If any other SAN Volume Controller or IBM Storwize V3700 ports are visible on the SAN
(aside from the ones on the cluster where you are making changes), you cannot change
the layer.
If any host object is defined to an IBM SAN Volume Controller or IBM Storwize V3700
system, you cannot change the layer.
If any MDisks from an IBM Storwize V3700 other than the one you are making the layer
change on are visible, you cannot change the layer.
If any cluster partnership is defined, you cannot change the layer.
Partnership topologies
A partnership between up to four IBM Storwize V3700 systems are allowed.
The following typical partnership topologies between multiple IBM Storwize V3700s are
available:
Daisy-chain topology, as shown in Figure 10-74.
Figure 10-74 Daisy chain partnership topology for IBM Storwize V3700
Triangle topology, as shown in Figure 10-75.
Figure 10-75 Triangle partnership topology for IBM Storwize V3700

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Star topology, as shown in Figure 10-76 on page 501.
Figure 10-76 Star topology for IBM Storwize V3700
Full-meshed topology, as shown in Figure 10-77.
Figure 10-77 Full-meshed topology
Partnership states
A partnership has the following states:
Partially Configured
Indicates that only one cluster partner is defined from a local or remote cluster to the
displayed cluster and is started. For the displayed cluster to be configured fully and to
complete the partnership, you must define the cluster partnership from the cluster that is
displayed to the corresponding local or remote cluster.
Fully Configured
Indicates that the partnership is defined on the local and remote clusters and is started.
Partnerships: These partnerships are valid for configurations with SAN Volume
Controllers and IBM Storwize V3700 systems if the IBM Storwize V3700 systems are using
the replication layer. They are also valid for IBM Storwize V5000 and V7000 products.

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Remote Not Present
Indicates that the remote cluster is not present for the partnership.
Partially Configured (Local Stopped)
Indicates that the local cluster is only defined to the remote cluster and the local cluster is
stopped.
Fully Configured (Local Stopped)
Indicates that a partnership is defined on the local and remote clusters and the remote
cluster is present, but the local cluster is stopped.
Fully Configured (Remote Stopped)
Indicates that a partnership is defined on the local and remote clusters and the remote
cluster is present, but the remote cluster is stopped.
Fully Configured (Local Excluded)
Indicates that a partnership is defined between a local and remote cluster; however, the
local cluster is excluded. Usually this state occurs when the fabric link between the two
clusters is compromised by too many fabric errors or slow response times of the cluster
partnership.
Fully Configured (Remote Excluded)
Indicates that a partnership is defined between a local and remote cluster; however, the
remote cluster is excluded. Usually this state occurs when the fabric link between the two
clusters is compromised by too many fabric errors or slow response times of the cluster
partnership.
Fully Configured (Remote Exceeded)
Indicates that a partnership is defined between a local and remote cluster and the remote
is available; however, the remote cluster exceeds the number of allowed clusters within a
cluster network. The maximum of four clusters can be defined in a network. If the number
of clusters exceeds that limit, the IBM Storwize V3700 system determines the inactive
cluster or clusters by sorting all the clusters by their unique identifier in numerical order.
The inactive cluster partner that is not in the top four of the cluster-unique identifiers
shows Fully Configured (Remote Exceeded).
Remote Copy relationships
A Remote Copy relationship is a relationship between two individual volumes of the same
size. These volumes are called a
master (source) volume
and an
auxiliary (target) volume
.
Typically, the master volume contains the production copy of the data and is the volume that
the application normally accesses. The auxiliary volume typically contains a backup copy of
the data and is used for disaster recovery.
The master and auxiliary volumes are defined when the relationship is created, and these
attributes never change. However, either volume can operate in the primary or secondary role
as necessary. The primary volume contains a valid copy of the application data and receives
updates from the host application, which is analogous to a source volume. The secondary
volume receives a copy of any updates to the primary volume because these updates are all
transmitted across the mirror link. Therefore, the secondary volume is analogous to a
continuously updated target volume. When a relationship is created, the master volume is
assigned the role of primary volume and the auxiliary volume is assigned the role of
secondary volume. The initial copying direction is from master to auxiliary. When the
relationship is in a consistent state, you can reverse the copy direction.

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The two volumes in a relationship must be the same size. The Remote Copy relationship can
be established on the volumes within one IBM Storwize V3700 storage system, which is
called an
intra
-cluster relationship. The relationship can also be established in different IBM
Storwize V3700 storage systems or between an IBM Storwize V3700 storage system and an
IBM SAN Volume Controller, IBM Storwize V5000, or IBM Storwize V7000, which are called
inter
-cluster relationships.
Usage of Remote Copy target volumes as Remote Copy source volumes is not allowed. A
FlashCopy target volume can be used as Remote Copy source volume and as a Remote
Copy target volume.
Metro Mirror
Metro Mirror is a type of Remote Copy that creates a synchronous copy of data from a master
volume to an auxiliary volume. With synchronous copies, host applications write to the master
volume but do not receive confirmation that the write operation completed until the data is
written to the auxiliary volume. This action ensures that both volumes have identical data
when the copy completes. After the initial copy completes, the Metro Mirror function maintains
a fully synchronized copy of the source data at the target site at all times.
Figure 10-78 shows how a write to the master volume is mirrored to the cache of the auxiliary
volume before an acknowledgement of the write is sent back to the host that issued the write.
This process ensures that the auxiliary is synchronized in real time if it is needed in a failover
situation.
Figure 10-78 Write on volume in a Metro Mirror relationship
The Metro Mirror function supports copy operations between volumes that are separated by
distances up to 300 km. For disaster recovery purposes, Metro Mirror provides the simplest
way to maintain an identical copy on both the primary and secondary volumes. However, as
with all synchronous copies over remote distances, there can be a performance impact to
host applications. This performance impact is related to the distance between primary and
secondary volumes and, depending on application requirements, its use might be limited
based on the distance between sites.

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Global Mirror
Global Mirror provides an asynchronous copy, which means that the secondary volume is not
an exact match of the primary volume at every point. The Global Mirror function provides the
same function as Metro Mirror Remote Copy without requiring the hosts to wait for the full
round-trip delay of the long-distance link; however, some delay can be seen on the hosts in
congested or overloaded environments. Make sure that you closely monitor and understand
your workload.
In asynchronous Remote Copy (which Global Mirror provides), write operations are
completed on the primary site and the write acknowledgement is sent to the host before it is
received at the secondary site. An update of this write operation is sent to the secondary site
at a later stage, which provides the capability to perform Remote Copy over distances
exceeding the limitations of synchronous Remote Copy.
The distance of Global Mirror replication is limited primarily by the latency of the WAN Link
provided. Global Mirror has a requirement of 80 ms round-trip-time for data sent to the remote
location. The propagation delay is roughly 8.2 µs per mile or 5 µs per kilometer for Fibre
Channel connections. Each device in the path adds delay of about 25 µs. Devices that use
software (such as some compression devices) adds much more time. The time that is added
by software-assisted devices is highly variable and should be measured directly. Be sure to
include these times when you are planning your Global Mirror design.
You should also measure application performance that is based on the expected delays
before Global Mirror is fully implemented. The IBM Storwize V3700 storage system provides
you with an advanced feature of Global Mirror that permits you to test performance
implications before Global Mirror is deployed and a long-distance link is obtained. This
advanced feature is enabled by modifying the IBM Storwize V3700 storage system
parameters gmintradelaysimulation and gminterdelaysimulation. These two parameters
can be used to simulate the write delay to the secondary volume. The delay simulation can be
enabled separately for each intra-cluster or inter-cluster Global Mirror. You can use this
feature to test an application before the full deployment of the Global Mirror feature. For more
information about how to enable the CLI feature, see Appendix A, “Command-line interface
setup and SAN Boot” on page 593.
Figure 10-79 on page 505 shows that a write operation to the master volume is
acknowledged back to the host that is issuing the write before the write operation is mirrored
to the cache for the auxiliary volume.

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Figure 10-79 Global Mirror write sequence
The Global Mirror algorithms maintain a consistent image on the auxiliary volume at all times.
They achieve this consistent image by identifying sets of I/Os that are active concurrently at
the master, assigning an order to those sets, and applying those sets of I/Os in the assigned
order at the secondary.
In a failover scenario where the secondary site must become the master source of data,
certain updates might be missing at the secondary site depending on the workload pattern
and the bandwidth and distance between local and remote site. Therefore, any applications
that use this data must have an external mechanism for recovering the missing updates and
reapplying them; for example, a transaction log replay.
10.2.3 Global Mirror with Change Volumes
Global Mirror within the IBM Storwize V3700 is designed to achieve an RPO as low as
possible so that data is as up-to-date as possible. This capability places some strict
requirements on your infrastructure and in certain situations with low network link quality or
congested or overloaded hosts, you maybe impacted by multiple 1920 (congestion) errors.
Congestion errors happen in the following primary situations:
Congestion at the source site through the host or network.
Congestion in the network link or network path.
Congestion at the target site through the host or network.
Global Mirror has functionality that is designed to address the following conditions that
negatively affect some Global Mirror implementations:
Estimation of bandwidth requirements tends to be complex.
It is often difficult to ensure that the latency and bandwidth requirements can be met.
Congested hosts on either the source or target site can cause disruption.
Congested network links can cause disruption with only intermittent peaks.

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To address these issues,
Change Volumes
were added as an option for Global Mirror
relationships. Change Volumes use the FlashCopy functionality but cannot be manipulated as
FlashCopy volumes because they are special purpose only. Change Volumes replicate
point-in-time images on a cycling period (the default is 300 seconds). This situation means
that your change rate only needs to include the condition of the data at the point in time that
the image was taken instead of all the updates during the period. This situation can provide
significant reductions in replication volume.
Figure 10-80 shows a basic Global Mirror relationship without Change Volumes.
Figure 10-80 Global Mirror without Change Volumes
Figure 10-81 shows the Change Volumes.
Figure 10-81 Global Mirror with Change Volumes
With Change Volumes, a FlashCopy mapping exists between the primary volume and the
primary Change Volume. The mapping is updated during a cycling period (every 60 seconds
to one day.) The primary Change Volume is then replicated to the secondary Global Mirror
volume at the target site, which is then captured in another change volume on the target site.
This situation provides an always consistent image at the target site and protects your data
from being inconsistent during resynchronization.
Take a closer look at how Change Volumes might reduce replication traffic.

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Figure 10-82 shows a number of I/Os on the source volume and the same number on the
target volume, and in the same order. Assuming that this set is the same set of data being
updated over and over, these updates are wasted network traffic and the I/O can be
completed much more efficiently, as shown in Figure 10-83.
Figure 10-82 Global Mirror I/O replication without Change Volumes
In Figure 10-83, the same data is being updated repeatedly, so Change Volumes
demonstrate significant IO transmission savings because you only must send I/O number 16,
which was the last I/O before the cycling period.
Figure 10-83 Global Mirror I/O replication with Change Volumes
The cycling period can be adjusted by running the chrcrelationship -cycleperiodseconds
<60-86400> command. If a copy does not complete in the cycle period, the next cycle does
not start until the prior one completes. It is for this reason that the use of Change Volumes
gives you the following possibilities for RPO:
If your replication completes in the cycling period, your RPO is twice the cycling period.
If your replication does not complete within the cycling period, your RPO is twice the
completion time. The next cycling period starts immediately after the prior one is finished.
Careful consideration must be put into balancing your business requirements with the
performance of Global Mirror with Change Volumes. Global Mirror with Change Volumes
increases the inter-cluster traffic for more frequent cycling periods, so going as short as
possible is not always the answer. In most cases, the default should meet your requirements
and perform reasonably well.

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Remote Copy consistency groups
A consistency group is a logical entity that groups copy relationships. By grouping the
relationships, you can ensure that these relationships are managed in unison and the data
within the group is in a consistent state. For more information about the necessity of
consistency groups, see 10.1.6, “Managing a FlashCopy consistency group” on page 489.
Remote Copy commands can be issued to a Remote Copy consistency group, and therefore
simultaneously for all Metro Mirror relationships that are defined within that consistency group
or to a single Metro Mirror relationship that is not part of a Metro Mirror consistency group.
Figure 10-84 shows the concept of Remote Copy consistency groups. Because the
RC_Relationships 1 and 2 are part of the consistency group, they can be handled as one
entity, while the stand-alone RC_Relationship 3 is handled separately.
Figure 10-84 Remote Copy consistency group
Important: When Global Mirror volumes are used with Change Volumes, make sure that
you remember to select the Change Volume on the auxiliary (target) site. Failure to do so
leaves you exposed during a resynchronization operation.
Also, the GUI automatically creates Change Volumes for you. However, it is a limitation of
this initial release that they are fully provisioned volumes. To save space, you should create
thin-provisioned volumes before and use the existing volume option to select your change
volumes.

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Remote Copy relationships can only belong to one consistency group, but they do not have to
belong to a consistency group. Relationships that are not part of a consistency group are
called
stand-alone relationships
. A consistency group can contain zero or more relationships.
All relationships in a consistency group must have matching primary and secondary clusters,
which are sometimes referred to as
master
and
auxiliary clusters
. All relationships in a
consistency group must also have the same copy direction and state.
Metro Mirror and Global Mirror relationships cannot belong to the same consistency group. A
copy type is automatically assigned to a consistency group when the first relationship is
added to the consistency group. After the consistency group is assigned a copy type, only
relationships of that copy type can be added to the consistency group.
Remote Copy and consistency group states
Stand-alone Remote Copy relationships and consistency groups share a common
configuration and state model. All of the relationships in a non-empty consistency group have
the same state as the consistency group.
The following states apply to the relationships and the consistency groups, except for the
Empty state, which is only for consistency groups:
InconsistentStopped
The primary volumes are accessible for read and write I/O operations, but the secondary
volumes are not accessible for either one. A copy process must be started to make the
secondary volumes consistent.
InconsistentCopying
The primary volumes are accessible for read and write I/O operations, but the secondary
volumes are not accessible for either one. This state indicates that a copy process is
ongoing from the primary to the secondary volume.
ConsistentStopped
The secondary volumes contain a consistent image, but it might be outdated with respect
to the primary volumes. This state can occur when a relationship was in the
ConsistentSynchronized state and experiences an error that forces a freeze of the
consistency group or the Remote Copy relationship.
ConsistentSynchronized
The primary volumes are accessible for read and write I/O operations. The secondary
volumes are accessible for read-only I/O operations.
Idling
The primary volumes and the secondary volumes are operating in the primary role.
Consequently, the volumes are accessible for write I/O operations.
IdlingDisconnected
The volumes in this half of the consistency group are all operating in the primary role and
can accept read or write I/O operations.
InconsistentDisconnected
The volumes in this half of the consistency group are all operating in the secondary role
and cannot accept read or write I/O operations.

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ConsistentDisconnected
The volumes in this half of the consistency group are all operating in the secondary role
and can accept read I/O operations but not write I/O operations.
Empty
The consistency group does not contain any relationships.
10.2.4 Remote Copy planning
Before you use Remote Copy, you must plan for its usage.
General guidelines for Remote Copy
General guidelines for Remote Copy include the following items:
The remote mirroring license must be acquired for the primary and remote systems.
Partnerships between up to four IBM Storwize V3700 storage systems, IBM SAN Volume
Controller systems, IBM Storwize VXXXX, or IBM Storwize V3700 is allowed. The
partnership must be defined on any partnered IBM Storwize storage systems or IBM SAN
Volume Controller systems to make it fully functional.
The two volumes in a relationship must be the same size.
The Remote Copy relationship can be established on the volumes within one IBM
Storwize V3700 storage system or in different IBM Storwize V3700 storage systems.
You cannot use Remote Copy target volumes as Remote Copy source volumes. However,
a FlashCopy target volume can be used as Remote Copy source volume. There are other
restrictions outlined in Table 10-5 on page 512.
The Metro Mirror function supports copy operations between volumes that are separated
by distances up to 300 km.
One Remote Copy relationship can only belong to one consistency group.
All relationships in a consistency group must have matching primary and secondary
clusters, which are sometimes referred to as
master
and
auxiliary
clusters. All
relationships in a consistency group must also have the same copy direction and state.
Metro Mirror and Global Mirror relationships cannot belong to the same consistency
group.
To manage multiple Remote Copy relationships as one entity, relationships can be made
part of a Remote Copy consistency group, which ensures data consistency across
multiple Remote Copy relationships and provides ease of management.
An IBM Storwize V3700 storage system implements flexible resynchronization support,
enabling it to resynchronize volume pairs that have experienced write I/Os to both disks
and to resynchronize only those regions that are known to have changed.
Global Mirror with Change Volumes should have Change Volumes defined for the master
and auxiliary volumes.

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Remote Copy configuration limits
Table 10-4 lists the Remote Copy configuration limits.
Table 10-4 Remote Copy configuration limits
SAN planning for Remote Copy
In this section, we describe some guidelines for planning for a SAN for Remote Copy.
Zoning recommendation
Node canister ports on each IBM Storwize V3700 must communicate with each other for the
partnership creation to be performed. These ports must be visible to each other on your SAN.
Proper switch zoning is critical to facilitating inter-cluster communication.
The following SAN zoning recommendations can be considered:
For each node canister, exactly two Fibre Channel ports should be zoned to exactly two
Fibre Channel ports from each node canister in the partner cluster.
If dual-redundant inter-switch links (ISLs) are available, the two ports from each node
should be split evenly between the two ISLs; that is, exactly one port from each node
canister should be zoned across each ISL.
For more information, see this website:
http://www-01.ibm.com/support/docview.wss?uid=ssg1S1003634&myns=s033&mynp=famil
yind5329743&mync=E
Additionally, all local zoning rules should be followed. A properly configured SAN fabric is
key to not only local SAN performance, but Remote Copy.
For more information, see this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.
storwize.v3700.641.doc%2Fv3700_ichome_641.html
Remote Copy link requirements
The following link requirements are valid for Metro Mirror and Global Mirror:
Round-trip latency
The total round-trip latency must be less than 80 ms, and less than 40 ms in each
direction. Latency simulations should be performed with your applications before any
network links are put in place to see if the applications perform at an acceptable level while
meeting the round-trip latency requirement.
Parameter Value
Number of Remote Copy consistency groups per cluster 256
Number of Remote Copy relationships per consistency group 8,192
Total Remote Copy volume capacity per system.1024 TB
Fabrics: When a local fabric and a remote fabric are connected for Remote Copy
purposes, the ISL hop count between a local node and a remote node cannot exceed
seven.

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Bandwidth
The bandwidth must satisfy the following requirements:
– If you are not using Change Volumes: Can sustain peak write load for all mirrored
volumes and background copy traffic.
– If you are using Change Volumes with Global Mirror: Can sustain change rate of
Source Change Volumes and background copy traffic.
– More background copy rate (the best practice is 10% to 20% of maximum peak load)
for initial synchronization and resynchronization.
– Remote Copy internal communication at idle with or without Change Volumes is
approximately 2.6 Mbps (the minimum amount).
Interaction between Remote Copy and FlashCopy
Table 10-5 lists which combinations of FlashCopy and Remote Copy are supported.
Table 10-5 FlashCopy and Remote Copy interaction
If you are not using Global Mirror with Change Volumes, for disaster recovery purposes, you
can use the FlashCopy feature to create a consistent copy of an image before you restart a
Global Mirror relationship.
When a consistent relationship is stopped, the relationship enters the consistent_stopped
state. While in this state, I/O operations at the primary site continue to run. However, updates
are not copied to the secondary site. When the relationship is restarted, the synchronization
process for new data is started. During this process, the relationship is in the
inconsistent_copying state. The secondary volume for the relationship cannot be used until
the copy process completes and the relationship returns to the consistent state. When this
situation occurs, start a FlashCopy operation for the secondary volume before you restart the
relationship. While the relationship is in the Copying state, the FlashCopy feature can provide
a consistent copy of the data. If the relationship does not reach the synchronized state, you
can use the FlashCopy target volume at the secondary site.
Redundancy: If the link between two sites is configured with redundancy so that it can
tolerate single failures, the link must be sized so that the bandwidth and latency
requirement can be met during single failure conditions.
Component Remote Copy primary Remote Copy secondary
FlashCopy source Supported Supported.
When the FlashCopy relationship is in the
Preparing and Prepared states, the cache
at the Remote Copy secondary site
operates in write-through mode. This
process adds latency to the already latent
Remote Copy relationship.
FlashCopy target This combination is supported.
Issuing stop -force might
cause the Remote Copy
relationship to fully
resynchronize.
This combination is supported with the
restriction that the FlashCopy mapping
cannot be copying, stopping, or
suspended. Otherwise, the restrictions
are the same as at the Remote Copy
primary site.

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10.3 Troubleshooting Remote Copy
Remote Copy (Global Mirror and Metro Mirror) has two primary error codes: 1920 or 1720. A
1920 error is a congestion error. This error means that the source, the link between source
and target, or the target cannot keep up with the rate of demand. A 1720 error is a heartbeat
or cluster partnership communication error. This error tends to be more serious because
failing communication between your cluster partners involves some extended diagnostic time.
10.3.1 1920 error
A 1920 error (event ID 050010) can have several triggers. The following cause projections are
probable:
Primary cluster or SAN fabric problem (10%)
Primary cluster or SAN fabric configuration (10%)
Secondary cluster or SAN fabric problem (15%)
Secondary cluster or SAN fabric configuration (25%)
Inter-cluster link problem (15%)
Inter-cluster link configuration (25%)
In practice, the error that is most often overlooked is latency. Global Mirror has a
round-trip-time tolerance limit of 80 ms. A message that is sent from your source cluster to
your target cluster and the accompanying acknowledgement must have a total time of 80 ms
or 40 ms each way.
The primary component of your round-trip time is the physical distance between sites. For
every 1,000 km there is a 5 ms delay. This delay does not include the time added by
equipment in the path. Every device adds a varying amount of time (depending on the device)
but expect about 25 µs for pure hardware devices. For software-based functions (such as
compression implemented in software), the delay added tends to be much higher (usually in
the millisecond plus range).
Consider an example. Company A has a production site that is 1,900 km distant from their
recovery site. Their network service provider uses a total of five devices to connect the two
sites. In addition to those devices, Company A uses a SAN Fibre Channel Router at each site
to provide FCIP to encapsulate the Fibre Channel traffic between sites. There are now seven
devices, and 1900 km of distance delay. All the devices add 200 µs of delay each way. The
distance adds 9.5 ms each way, for a total of 19 ms. Combined with the device latency, that is
19.4 ms of physical latency at a minimum. This latency is under the 80 ms limit of Global
Mirror, but this number is the best case number. Link quality and bandwidth play a significant
role here. Your network provider likely ensures a latency maximum on your network link; be
sure to stay below the Global Mirror RTT (Round Trip Time) limit. You can easily double or
triple the expected physical latency with a lower quality or lower bandwidth network link. As a
result, you are suddenly within range of exceeding the limit the moment a large flood of I/O
happens that exceeds the bandwidth capacity you have in place.
When you receive a 1920 error, always check the latency first. Remember that the FCIP
routing layer can introduce latency if it is not properly configured. If your network provider
reports a much lower latency, this report can be an indication of a problem at your FCIP
Routing layer. Most FCIP Routing devices have built-in tools to allow you to check the RTT.
When you are checking latency, remember that TCP/IP routing devices (including FCIP
routers) report RTT that uses standard 64-byte ping packets.

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Figure 10-85 shows why the effective transit time should only be measured by using packets
large enough to hold a Fibre Channel frame. This packet size is 2148 bytes (2112 bytes of
payload and 36 bytes of header) and you should allow some more capacity to be safe
because different switching vendors have optional features that might increase this size.
Figure 10-85 The effect of packet size (in bytes) versus the link size
Before you proceed, take a quick look at the second largest component of your
round-trip-time, that is, serialization delay. Serialization delay is the amount of time that is
required to move a packet of data of a specific size across a network link of a given
bandwidth. This delay is based on a simple concept: the time that is required to move a
specific amount of data decreases as the data transmission rate increases.
In Figure 10-85, there are orders of magnitude of difference between the different link
bandwidths. It is easy to see how 1920 errors can arise when your bandwidth is insufficient
and why you should never use a TCP/IP ping to measure RTT for FCIP traffic.
Figure 10-85 compares the amount of time in microseconds required to transmit a packet
across network links of varying bandwidth capacity. The following packet sizes are used:
64 bytes: The size of the common ping packet.
1500 bytes: The size of the standard TCP/IP packet.
2148 bytes: The size of a Fibre Channel frame.
Remember that your path MTU affects the delay that is incurred in getting a packet from one
location to another when it causes fragmentation or is too large and causes too many
retransmits when a packet is lost. After you verify your latency by using the correct packet
size, proceed with normal hardware troubleshooting.

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10.3.2 1720 error
The 1720 error (event ID 050020) is the other primary error code of Remote Copy. Because
the term
System Partnership
implies that all involved virtualization systems are partners, they
must communicate with each other. When a partner on either side stops communicating, you
see a 1720 error appear in your error log. According to official documentation, there are no
likely field replaceable unit breakages or other causes.
In practice, the source of this error is most often a fabric problem or a problem in the network
path between your partners. When you receive this error, if your fabric has more than 64 HBA
ports zoned, you should check your fabric configuration for zoning of more than one HBA port
for each node. One port for each node that is associated with the host is the recommended
zoning configuration for fabrics. For those fabrics with 64 or more host ports, this
recommendation becomes a rule. You must follow this zoning rule or the configuration is
technically unsupported.
Improper zoning leads to SAN congestion, which can inhibit remote link communication
intermittently. Checking the zero buffer credit timer through IBM Tivoli Storage Productivity
Center and comparing its value against your sample interval might reveal potential SAN
congestion. When a zero buffer credit timer is above 2% of the total time of the sample
interval, it is likely to cause problems.
Next, always ask your network provider to check the status of the link. If the link is okay, watch
for repetition of this error. It is possible in a normal and functional network setup to have
occasional 1720 errors, but multiple occurrences point to a larger problem.
If you receive multiple 1720 errors, recheck your network connection and then check the IBM
Storwize V3700 partnership information to verify their status and settings. Perform diagnostic
tests for every piece of equipment in the path between the two systems. It often helps to have
a diagram showing the path of your replication from both logical and physical configuration
viewpoints.
If your investigation fails to resolve your Remote Copy problems, you should contact your IBM
support representative for a complete analysis.
10.4 Managing Remote Copy using the GUI
The IBM Storwize V3700 storage system provides a separate function icon for copy service
management. The following windows are available for managing Remote Copy, which are
accessed through the Copy Services function icon:
Remote Copy
Partnerships
As the name implies, these windows are used to manage Remote Copy and the partnership.
10.4.1 Managing cluster partnerships
The Partnership window is used to manage a partnership between clusters. To access the
Partnership window, click the Copy Services function icon and then click Partnerships, as
shown in Figure 10-86 on page 516.

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Figure 10-86 Partnership window
Creating a partnership
No partnership is defined in our example (see Figure 10-87), so you must create a
partnership between the IBM Storwize V3700 systems. Click New Partnership in the
Partnership window.
Figure 10-87 Create a cluster partnership

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If there is no partnership candidate, an error window opens, as shown in Figure 10-88.
Figure 10-88 No candidates are available to create a partnership
Check the zoning and the system status and make sure that the clusters can see each other.
Then you can create your partnership by selecting the appropriate remote storage system
(see Figure 10-89), and defining the available bandwidth between both systems.
Figure 10-89 Select the remote IBM Storwize storage system for a new partnership
The bandwidth you must input here is used by the background copy process between the
clusters in the partnership. To set the background copy bandwidth optimally, make sure that
you consider all three resources (the primary storage, the inter-cluster link bandwidth, and the
auxiliary storage) to avoid overloading them and affecting the foreground I/O latency.
Click Create and the partnership definition is complete on the first IBM Storwize V3700
system. You can find the partnership listed in the left pane of the Partnership window. If you
select the partnership, more information for this partnership is displayed on the right, as
shown in Figure 10-90 on page 518.

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Figure 10-90 Partially configured partnership
Complete the same steps on the second storage system for the partnership to become fully
configured. The Remote Copy partnership is now implemented between the two IBM
Storwize V3700 systems and both systems are ready for further configuration of Remote
Copy relationships, as shown in Figure 10-91.
Figure 10-91 Fully configured partnership
You can also change the bandwidth setting for the partnership in the Partnerships window.
Click Apply Changes to confirm your modification.
Important: The state of the partnership is “Partially Configured: Local” because we did not
define it on the other IBM Storwize V3700. For more information about partnership states,
see “Remote Copy and consistency group states” on page 509.

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Stopping and starting a partnership
You can stop the partnership by clicking Stop Partnership from the Actions drop-down menu,
as shown in Figure 10-92. If you stop the partnership, the relationship that uses this
partnership is disconnected.
Figure 10-92 Stop the partnership
After you stop the partnership, your partnership is listed as Fully Configured: Stopped, as
shown in Figure 10-93.
Figure 10-93 Fully configured partnership in stopped state
You can restart a stopped partnership by clicking Start Partnership from the Actions
drop-down menu.
The partnership returns to the fully configured status when it is restarted.
Deleting a partnership
You can delete a partnership by selecting Delete Partnership from the Actions drop-down
menu, as shown in Figure 10-92.

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10.4.2 Managing stand-alone Remote Copy relationships
A Remote Copy relationship can be defined between two volumes, where one is the master
(source) and the other one is the auxiliary (target) volume. Usage of Remote Copy auxiliary
volumes as Remote Copy master volumes is not allowed. Open the Remote Copy window to
manage Remote Copy by clicking the Copy Services icon and then clicking Remote Copy,
as shown in Figure 10-94.
Figure 10-94 Open Remote Copy window

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The Remote Copy window (see Figure 10-95) is where you can manage Remote Copy
relationships and Remote Copy consistency groups.
Figure 10-95 Remote Copy window
The Remote Copy window displays a list of Remote Copy consistency groups. You can also
take actions on the Remote Copy relationships and Remote Copy consistency groups. Click
Not in a Group and all the Remote Copy relationships that are not in any Remote Copy
consistency groups are displayed. To customize the blue column heading bar and select
different attributes of Remote copy relationships, right-click anywhere in the blue bar.
Creating stand-alone Remote Copy relationships
To create a Remote Copy relationship, click New Relationship at the top of the Remote Copy
window, as shown in Figure 10-95). A wizard opens and guides you through the Remote
Copy relationship creation process.
As shown in Figure 10-96 on page 522, you must set the Remote Copy relationship type first.
Based on your requirements, you can select Metro Mirror (synchronous replication) or Global
Mirror (asynchronous replication). Select the appropriate replication type and click Next.
Important: Before a remote copy relationship is created, target volumes that are the same
size as the source volumes that you want to mirror must be created. For more information
about creating volumes, see Chapter 5, “Basic volume configuration” on page 189.

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Figure 10-96 Select the appropriate Remote Copy type
You must select where your auxiliary (target) volumes are: the local system or the already
defined second storage system. In our example (see Figure 10-97), choose another system
to build an inter-cluster relationship. Click Next to continue.
Figure 10-97 Select Remote Copy partner
The Remote Copy master and auxiliary volume must be specified. Both volumes must have
the same size. As shown in Figure 10-98 on page 523, the system offers only appropriate
auxiliary candidates with the same volume size as the selected master volume. After you
select the volumes based on your requirement, click Add.

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Figure 10-98 Select the master and auxiliary volume
You can define multiple and independent relationships by clicking Add. You can remove a
relationship by clicking the red cross. In our example, we create two independent Remote
Copy relationships, as shown in Figure 10-99.
Figure 10-99 Define multiple independent relationships
A window opens and asks if the volumes in the relationship are already synchronized. In most
situations, the data on the master volume and on the auxiliary volume are not identical, so
click No and then click Next to enable an initial copy, as shown in Figure 10-100.

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Figure 10-100 Activate initial data copy
If you select Yes, the volumes are already synchronized in this step, a warning message
opens, as shown in Figure 10-101. Make sure that the volumes are truly identical, and then
click OK to continue.
Figure 10-101 Warning message to make sure that the volumes are synchronized
You can choose to start the initial copying progress now, or wait to start it at a later time. In our
example, select Yes, start copying now and then click Finish, as shown in Figure 10-102.
Figure 10-102 Choose if you want to start copying now or later
After the Remote Copy relationships creation completes, two independent Remote Copy
relationships are defined and displayed in the Not in a Group list, as shown in Figure 10-103.

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Figure 10-103 Remote Copy relationship create process completes
Optionally, you can monitor the ongoing initial synchronization in the Running Tasks status
indicator, as shown in Figure 10-104 on page 525. Highlight one of the operations and click it
to see the progress.
Figure 10-104 Remote copy initialization progress through Running Tasks
Stopping a stand-alone Remote Copy relationship
The Remote Copy relationship can be stopped by selecting the relationship and clicking Stop
from the Actions drop-down menu, as shown in Figure 10-105.

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Figure 10-105 Stop Remote Copy relationship
A prompt appears. Click to allow secondary read/write access, if required, and then click Stop
Relationship, as shown in Figure 10-106.
Figure 10-106 Option to allow secondary read/write access
After the stop completes, the state of the Remote Copy relationship is changed from
Consistent Synchronized to Idling, as shown in Figure 10-107. Read/write access to both
volumes is now allowed unless you selected otherwise.

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Figure 10-107 Remote Copy relationship stop completes
Starting a stand-alone Remote Copy relationship
The Remote Copy relationship can be started by selecting the relationship and clicking Start
from the Actions drop-down menu, as shown in Figure 10-108.
Figure 10-108 Start a Remote Copy relationship
When a Remote Copy relationship is started, the most important item is selecting the copy
direction. Both master and auxiliary volumes can be the primary. Make your decision based
on your requirements and click Start Relationship. In our example, choose the master
volume to be the primary, as shown in Figure 10-109.

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Figure 10-109 Choose the copy direction
Switching the direction of a stand-alone Remote Copy relationship
The copy direction of the Remote Copy relationship can be switched by selecting the
relationship and clicking Switch from the Actions drop-down menu, as shown in
Figure 10-110.
Figure 10-110 Switch Remote Copy relationship
A warning message opens and shows you the consequences of this action, as shown in
Figure 10-111. If you switch the Remote Copy relationship, the copy direction of the
relationship becomes the opposite; that is, the current primary volume becomes the
secondary, while the current secondary volume becomes the primary. Write access to the
current primary volume is lost and write access to the current secondary volume is enabled. If
it is not a disaster recovery situation, you must stop your host I/O to the current primary
volume in advance. Make sure that you are prepared for the consequences, and if so, click
OK to continue.

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Figure 10-111 Warning message for switching direction of a Remote Copy relationship
After the switch completes, your Remote Copy relationship is tagged, as shown in
Figure 10-112, and shows you that the primary volume in this relationship was changed.
Figure 10-112 Note the switch icon on the state of the relationship
Renaming a stand-alone Remote Copy relationship
The Remote Copy relationship can be renamed by selecting the relationship and clicking
Rename from the Actions drop-down menu, as shown in Figure 10-113.

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Figure 10-113 Rename the Remote Copy relationship
Enter the new name for the Remote Copy relationship and click Rename.
Deleting a stand-alone Remote Copy relationship
The Remote Copy relationship can be deleted by selecting the relationship and clicking
Delete Relationship from the Actions drop-down menu, as shown in Figure 10-114.
Figure 10-114 Delete a Remote Copy relationship
You must confirm this deletion by verifying the number of relationships to be deleted, as
shown in Figure 10-115. Click Delete to proceed.

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Figure 10-115 Confirm the relationship deletion
10.4.3 Managing a Remote Copy consistency group
A Remote Copy consistency group can be managed from the Remote Copy window as well.
Creating a Remote Copy consistency group
To create a Remote Copy consistency group, click New Consistency Group, as shown in
Figure 10-116.
Figure 10-116 Create a Remote Copy consistency group
You must enter a name for your new consistency group, as shown in Figure 10-117.

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Figure 10-117 Enter a name for the new consistency group
You are prompted for the location of auxiliary volumes, as shown in Figure 10-118 on
page 532. In our case, these volumes are on another system. Select the option and from the
drop-down menu, select the correct remote system. In our example, we only have one remote
system defined. Click Next to continue.
Figure 10-118 Remote Copy consistency group auxiliary volume location window
You are then prompted to create an empty consistency group or add relationships to it, as
shown in Figure 10-119.
Figure 10-119 Creating an empty consistency group

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If you select No and click Finish, the wizard completes and creates an empty Remote Copy
Consistency Group. Selecting Yes prompts for the type of copy to create, as shown in
Figure 10-120.
Figure 10-120 Remote Copy consistency group copy type
Choose the relevant copy type and click Next. In the following window, you can choose
existing relationships to add the new consistency group. This step is optional. Use the Ctrl
and Shift keys to select multiple relationships to add.
If you decide that you do not want to use any of these relationships but want to create
relationships, then click Next. However, if you already highlighted a relationship and then
decide you do not want any of these, the relationship cannot be removed. You must cancel
the wizard and start again, as shown in Figure 10-121 on page 534.

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Figure 10-121 Selecting existing relationships
The next window is optional and gives the option to create relationships to add to the
consistency group, as shown in Figure 10-122.
Figure 10-122 Creating relationships for Remote Copy consistency group

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Select the relevant Master and Auxiliary volumes for the relationship you want to create and
click Add. Multiple relationships can be defined by selecting another Master and Auxiliary
volume and clicking Add again. When you finish, click Next. The next window prompts for
whether the relationships are synchronized, as shown in Figure 10-123.
Figure 10-123 Volume synchronization
In the next window, you are prompted whether you want to start the volumes copying now, as
shown in Figure 10-124.
Figure 10-124 Remote Consistency group start copying option
After you select this option, click Finish to create the Remote Copy Consistency Group. Click
Close to close the task window and the new consistency group is now shown in the GUI, as
shown in Figure 10-125 on page 536.

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Figure 10-125 New Remote Consistency group created.
In our example, we created a consistency group with a single relationship and added further
Remote Copy relationships to the consistency group afterward.
You can find the name and the status of the consistency group next to the Relationship
function icon. It is easy to change the name of consistency group by right-clicking the name,
selecting Rename and then entering a new name. Alternatively, you can highlight the
consistency group and select Rename from the Actions drop-down menu. Similarly, you find
all the Remote Copy relationships in this consistency group below the Relationship function
icon. The actions on the Remote Copy relationships can be applied here by using the Actions
drop-down menu or right-clicking the relationships, as shown in Figure 10-126.
Figure 10-126 Drop-down menu options

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Adding Remote Copy to a consistency group
The Remote Copy relationships in the Not in a Group list can be added to a consistency
group by selecting the volumes and clicking Add to Consistency Group from the Actions
drop-down menu, as shown in Figure 10-127.
Figure 10-127 Add Remote Copy relationships to a consistency group
You must choose the consistency group to which to add the Remote Copy relationships.
Based on your requirements, select the appropriate consistency group and click Add to
Consistency Group, as shown in Figure 10-128.
Figure 10-128 Choose the consistency group to add the remote copies to
Your Remote Copy relationships are now in the consistency group that you selected.

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Starting a consistency group
The Remote Copy relationship can be started by clicking Start from the Actions drop-down
menu, as shown in Figure 10-129.
Figure 10-129 Start the consistency group
The consistency group starts copying data from the primary to the secondary.
Stopping a consistency group
The Remote Copy relationship can be stopped by clicking Stop in the Actions drop-down
menu, as shown in Figure 10-130.
Figure 10-130 Stop the consistency group

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You can allow read/write access to secondary volumes by selecting the option (see
Figure 10-131) and then clicking Stop Consistency Group.
Figure 10-131 Confirm consistency group stop and decide to allow secondary read/write access
Switching a consistency group
As with the switch action on the Remote Copy relationship, you can switch the copy direction
of the consistency group. To switch the copy direction of the consistency group, click Switch
from the Actions drop-down menu, as shown in Figure 10-132.
Figure 10-132 Switch the copy direction of a consistency group
A warning message opens, as shown in Figure 10-133 on page 540. After the switch, the
primary cluster in the consistency group is changed. Write access to current master volumes
is lost, while write access to the current auxiliary volumes is enabled. This affects host
access, so make sure that these settings are what you need. If the settings are as you want
them, click OK to continue.

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Figure 10-133 Warning message to confirm the switch
Removing Remote Copy relationships from a consistency group
The Remote Copy relationships can be removed from the consistency group by selecting the
Remote Copy relationships and clicking Remove from Consistency Group from the Actions
drop-down menu, as shown in Figure 10-134.
Figure 10-134 Remove Remote Copy relationships from a consistency group
You are prompted to confirm the Remote Copy relationships you want to delete from the
consistency group, as shown in Figure 10-135 on page 541. Make sure the Remote Copy
relationships that are shown in the field are the ones you want to remove from the consistency
group, and then click Remove to proceed.

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Figure 10-135 Confirm the relationships to remove from the Remote Copy consistency group
After the removal process completes, the Remote Copy relationships are deleted from the
consistency group and displayed in the Not in a Group list.
Deleting a consistency group
The consistency group can be deleted by selecting Delete from the Actions drop-down menu,
as shown in Figure 10-136.
Figure 10-136 Delete a consistency group
You must confirm the deletion of the consistency group, as shown in Figure 10-137. Click OK
if you are sure that this consistency group must be deleted.
Figure 10-137 Warning to confirm deletion of the consistency group

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The consistency group is deleted. Any relationships that were part of the consistency group
are returned to the Not in a Group list.

© Copyright IBM Corp. 2013. All rights reserved.
543
Chapter 11.
RAS, monitoring, and
troubleshooting
In this chapter, we show the ways in which the IBM Storwize V3700 can be administered from
a monitoring and troubleshooting point of view.
This chapter includes the following topics:
Reliability, availability and serviceability on the IBM Storwize V3700
Hardware and LED description
IBM Storwize V3700 components
Configuration backup procedure
Software upgrade
Troubleshooting
Recommended Actions
Event log navigation
Support
Shutting down the IBM Storwize V3700
Powering on the IBM Storwize V3700
11

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11.1 Reliability, availability, and serviceability on the IBM
Storwize V3700
This section describes the reliability, availability, and serviceability (RAS) features of the IBM
Storwize V3700 including monitoring and troubleshooting. RAS features are important
concepts in the design of the IBM Storwize V3700. Hardware and software features, design
considerations, and operational guidelines all contribute to make the IBM Storwize V3700
reliable.
Fault tolerance and a high level of availability are achieved by the following features:
The RAID capabilities of the underlying disk subsystems.
The compass architecture that is used by the IBM Storwize V3700 nodes.
Auto-restart of nodes that are hung.
Battery units to provide cache memory protection in the event of a site power failure.
Host system multipathing and failover support.
High levels of serviceability are achieved by providing the following benefits:
Cluster error logging
Asynchronous error notification
Dump capabilities to capture software detected failures
Concurrent diagnostic procedures
Directed maintenance procedures
Concurrent log analysis and memory dump data recovery tools
Concurrent maintenance of all IBM Storwize V3700 components
Concurrent upgrade of IBM Storwize V3700 Software and microcode
Concurrent addition or deletion of a node canister in a cluster
Software recovery through the Service Assistant Tool
Automatic software version correction when a node is replaced
Detailed status and error conditions that are displayed via the Service Assistant Tool
Error and event notification through Simple Network Management Protocol (SNMP),
syslog, and email
Node canister support package gathering via USB, in case of network connection problem
At the heart of the IBM Storwize V3700 is a redundant pair of
node canisters
. The two
canisters share the data that is transmitting and receiving load between the attached hosts
and the disk arrays.

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11.2 IBM Storwize V3700 components
This section describes each of the components that make up the IBM Storwize V3700
system. Components are described in terms of location, function, and serviceability.
11.2.1 Enclosure midplane assembly
The enclosure midplane assembly is the unit that contains the node or expansion canisters
and the power supply units. The enclosure midplane assembly initially is generic and is
configured as a control enclosure midplane or an expansion enclosure midplane. During the
basic system configuration, Vital Product Data (VPD) is written to the enclosure midplane
assembly, which decides whether the unit is a control enclosure midplane or an expansion
enclosure midplane.
Control enclosure midplane
The control enclosure midplane holds node canisters and the power supply units. The control
enclosure midplane assembly has specific VPD, such as WWNN 1, WWNN 2, machine type
and model, machine part number, and serial number. The control enclosure midplane must
be replaced only by a trained service provider. After a generic enclosure midplane assembly
is configured as a control enclosure midplane, it is no longer interchangeable with an
expansion enclosure midplane.
Expansion enclosure midplane
The expansion enclosure midplane holds expansion canisters and the power supply units.
The expansion enclosure midplane assembly also has specific VPD, such as machine type
and model, machine part number, and serial number. After a generic enclosure midplane
assembly is configured as an expansion enclosure midplane, it is no longer interchangeable
with a control enclosure midplane. The expansion enclosure midplane must be replaced only
by a trained service provider.
Figure 11-1 shows the rear view of the Enclosure Midplane Assembly.
Figure 11-1 Enclosure Midplane Assembly rear view
For more information about replacing the control or expansion enclosure midplane, see the
IBM Storwize V3700 Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/V3700_ic/index.jsp

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11.2.2 Node canisters: Ports and LED
There are two node canister slots along the top of the unit. The left slot is canister 1 and the
right slot is canister 2.
Figure 11-2 shows the back of a fully equipped node enclosure.
Figure 11-2 Node canister
USB ports
There are two USB connectors side-by-side and they are numbered as 1 on the left and as 2
on the right. There are no indicators that are associated with the USB ports. Figure 11-3
shows the USB ports.
Figure 11-3 Node Canister USB ports
Ethernet ports
There are two 10/100/1000 Mbps Ethernet ports side-by-side on the canister and they are
numbered 1 on the left and 2 on the right. Port 1 is required and port 2 optional. The ports are
shown in Figure 11-4.
Figure 11-4 Node canister Ethernet ports

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Each port has two LEDs and their status is shown in Table 11-1.
Table 11-1 Ethernet LEDs status
SAS ports
There are four 6-Gbps Serial Attached SCSI (SAS) ports side-by-side on both canisters. They
are numbered 1 on the left to 4 on the right. IBM Storwize V3700 uses port 1 and 2 and 3 for
host connectivity and port 4 to connect optional expansion enclosures. The ports are shown
in Figure 11-5.
Figure 11-5 Node canister SAS ports
The SAS LED status meanings are described in Table 11-2.
Table 11-2 SAS LED Status
LED Color Meaning
Link state Green It is on when there is an Ethernet link.
Activity Yellow It is flashing when there is activity on the link.
State Meaning
green Indicates at least one of the SAS lanes on this connector are operational.
If the light is off when it is connected, there is a problem with the connection.
amber If the light is on, one of the following errors occurred:
One or more, but not all, of the four lanes are up for this connector (if none
of the lanes are up, the activity light is off)
One or more of the up lanes are running at a different speed to the others
One or more of the up lanes are attached to a different address to the others

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The IBM Storwize V3700 uses SFF mini-SAS connector cable to connect expansion
enclosures, as shown in Figure 11-6.
Figure 11-6 Mini-SAS SFF 8644 connector
Battery status
Each node canister includes a battery, the status of which is displayed on three LEDs on the
back of the unit, as shown in Figure 11-7.
Figure 11-7 Node canister battery status
The battery indicator status meanings are described in Table 11-3.
Table 11-3 Battery indicator on Node canister
Color Name Definition
Green (left) Battery Status Fast flash: Indicates that the battery is charging and
has insufficient charge to complete a single dump.
Flashing: Indicates that the battery has sufficient
charge to complete a single dump only.
Solid: Indicates that the battery is fully charged and has
sufficient charge to complete two dumps.
Amber Fault Indicates a fault with the battery.
Green (right) Battery in use Indicates that hardened or critical data is writing to disk.

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Canister status
The status of each canister is displayed by three LEDs, as shown in Figure 11-8.
Figure 11-8 System status indicator
The system status LED meanings are described in Table 11-4.
Table 11-4 System status indicator
Color Name Definition
Green (left) System Power Flashing: The canister is in standby mode in which
case IBM Storwize V3700 is not running.
Fast flashing: The cannister is running a self test.
On: The cannister is powered up and the IBM Storwize
V3700 code is running.
Green (mid) System Status Off: There is no power to the canister, the canister is in
standby mode, Power On SelfTest (POST) is running
on the canister, or the operating system is loading.
Flashing: The node is in candidate or service state; it
cannot perform I/O. It is safe to remove the node.
Fast flash: A code upgrade is running.
On: The node is part of a cluster.
Amber Fault Off: The node is in candidate or active state. This state
does not mean there is no hardware error on the node.
Any error that is detected is not severe enough to stop
the node from participating in a cluster (or there is no
power).
Flashing: Identifies the canister.
On: The node is in service state, or there is an error
that is stopping the software from starting.

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11.2.3 Node canister replaceable hardware components
The IBM Storwize V3700 node canister includes the following replaceable components:
Host Interface Card
Memory
Battery
All of the components are customer-replaceable parts. Figure 11-9 shows the location of
these parts within the node canister.
Figure 11-9 Node canister customer replaceable parts
Host Interface Card replacement
For more information about the replacement process, see the IBM Storwize V3700
Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Ftbrd_rmvrplparts_1955wm.html
At the website, browse to Troubleshooting Removing and replacing parts  Replacing
host interface card.

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The host interface card replacement is shown in Figure 11-10.
Figure 11-10 Host Interface card replacement
Memory replacement
For more information about the memory replacement process, see the IBM Storwize V3700
Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Ftbrd_rmvrplparts_1955wm.html
At the website, browse to Troubleshooting Removing and replacing parts  Replacing
the node canister memory (4-GB DIMM).

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Figure 11-11 shows the memory location.
Figure 11-11 Memory replacement
Battery Backup Unit replacement
Because the Battery Backup Unit (BBU) is seated in the node canister, the BBU replacement
leads to a redundancy loss until the replacement is finished.
Therefore, it is recommended to replace the BBU only when advised to do so. It is also
recommended to follow the Directed Maintenance Procedures (DMP).
For more information about how to replace the BBU, see the Information Center at this
website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Ftbrd_rmvrplparts_1955wm.html
At the website, browse to Troubleshooting Removing and replacing parts  Replacing
battery in a node canister.
Caution: The battery is a lithium ion battery. To avoid possible explosion, do not incinerate
the battery. Exchange the battery only with the part that is approved by IBM.

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Complete the following steps to replace the BBU:
1.Grasp the blue touch points on each end of the battery, as shown in Figure 11-12.
Figure 11-12 BBU replacement: Step 1
2.Lift the battery vertically upwards until the connectors disconnect.
Figure 11-13 BBU replacement: Step 2
Important: During a BBU change, the battery must be kept parallel to the canister
system board while it is removed or replaced, as shown in Figure 11-13. Keep equal
force (or pressure) on each end.

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11.2.4 Expansion canister: Ports and LED
There are two expansion canister slots along the top of the unit.
SAS ports
SAS ports are used to connect the expansion canister to the node canister or to an extra
expansion in the chain. Figure 11-14 shows the SAS ports that are on the expansion canister.
Port 1 is for incoming SAS cables and Port 2 for outgoing cables.
Figure 11-14 Expansion canister SAS ports
The meaning of the SAS port LEDs is described in Table 11-5.
Table 11-5 SAS LED status meaning
Canister status
Each expansion canister has its status displayed by three LEDs, as shown in Figure 11-15.
Figure 11-15 Enclosure canister status
State Meaning
green Indicates at least one of the SAS lanes on this connector is operational.
If the light is off when connected, there is a problem with the connection.
amber If the light is on, one of the following errors occurred:
One or more, but not all, of the four lanes are up for this connector (if none
of the lanes are up, the activity light is off).
One or more of the up lanes are running at a different speed to the others.
One or more of the up lanes are attached to a different address to the
others.

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The LED status is described in Table 11-6.
Table 11-6 Enclosure canister status
11.2.5 Disk subsystem
The IBM Storwize V3700 disk sub-system is made up of enclosures, one control enclosure
and up to four expansion enclosures. Each enclosure contains the drives that are based on
the enclosure type.
This section describes the parts of the disk subsystem.
SAS cabling
Expansion enclosures are attached to control enclosures by using SAS cables. There is one
supported SAS chain and up to four expansion enclosures can be attached. The node
canister uses SAS ports 4 for enclosures.
The expansion canister has SAS port 1 for channel input and SAS port 2 for output to connect
another expansion enclosure.
Color Name Definition
Green (left) Power Indicates that the canister is receiving power.
Green (mid) Status If the light is on, the canister is running normally.
If the light is flashing, there is an error communicating with
the enclosure.
Amber Fault If the light is solid, there is an error that is logged against the
canister or the firmware is not running.
Important: When an SAS cable is inserted, ensure that the connector is oriented correctly
by confirming that the following conditions are met:
The pull tab must be below the connector.
Insert the connector gently until it clicks into place. If you feel resistance, the connector
is probably oriented the wrong way. Do not force it.
When inserted correctly, the connector can be removed only by pulling the tab.

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The SAS cabling is shown in Figure 11-16.
Figure 11-16 SAS cabling
A strand starts with an SAS initiator chip inside an IBM Storwize V3700 node canister and
progresses through SAS expanders, which connect disk drives. Each canister contains an
expander. Each drive has two ports, each of which is connected to a different expander and
strand. This configuration means both nodes have direct access to each drive and there is no
single point of failure.
At system initialization, when devices are added to or removed from strands (and at other
times), the IBM Storwize V3700 Software performs a discovery process to update the state of
the drive and enclosure objects.

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Slot numbers in enclosures
The IBM Storwize V3700 is made up of enclosures. There are four types of enclosures, as
described in Table 11-7.
Table 11-7 Enclosure slot numbering
Array goal
Each array has a set of goals that describe the wanted location and performance of each
array member. A sequence of drive failures and hot spare takeovers can leave an array
unbalanced; that is, with members that do not match these goals. The system automatically
rebalances such arrays when appropriate drives are available.
RAID level
An IBM Storwize V3700 supports RAID 0, RAID 1, RAID 5, RAID 6, or RAID 10. Each RAID
level is described in Table 11-8.
Table 11-8 RAID levels that are supported by an IBM Storwize V3700
Enclosure type Number of slots
Enclosure 12x 3.5-inch drives:
Control enclosure 2072-12C
Expansion enclosure 2072-12E
Enclosure with 12 slots.
Enclosure 24x 2.5-inch drives:
Control enclosure 2072-24C
Expansion enclosure 2072-24E
Enclosure with 24 slots.
RAID
level
Where data is striped Drive count
(Min - Max)
0 Arrays have no redundancy and do not support hot-spare takeover.1 - 8
1 Provides disk mirroring, which duplicates data between two drives. A
RAID 1 array is internally identical to a two-member RAID 10 array.
2
5 Arrays stripe data over the member drives with one parity strip on every
stripe. RAID 5 arrays have single redundancy with higher space
efficiency than RAID 10 arrays, but with some performance penalty. RAID
5 arrays can tolerate no more than one member drive failure.
3 - 16
6 Arrays stripe data over the member drives with two parity strips on every
stripe. A RAID 6 array can tolerate any two concurrent member drive
failures.
5 - 16

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Disk scrubbing
The scrub process runs when arrays do not have any other background processes. The
process checks that the drive logical block addresses (LBAs) are readable and array parity is
synchronized. Arrays are scrubbed independently and each array is entirely scrubbed every
seven days.
Solid-state drives
Solid-date drives (SSDs) are treated no differently by an IBM Storwize V3700 than traditional
hard disk drives (HDDs) in relation to RAID arrays or MDisks. The individual SSD drives in the
IBM Storwize V3700 are combined into an array, usually in RAID 10 or RAID 5 format. It is
unlikely that RAID 6 SSD arrays are used because of the double parity impact, with two SSD
logical drives that are used for parity only.
11.2.6 Power Supply Unit
All enclosures require two power supply units (PSUs) for normal operation. A single PSU can
power the entire enclosure for redundancy.
Figure 11-17 shows the power supplies.
Figure 11-17 Power supply
The left side PSU is numbered 1 and the right side PSU is numbered 2.
10 Arrays stripe data over mirrored pairs of drives. RAID 10 arrays have
single redundancy. The mirrored pairs rebuild independently. One
member out of every pair can be rebuilding or missing at the same time.
RAID 10 combines the features of RAID 0 and RAID 1.
2 - 16
RAID
level
Where data is striped Drive count
(Min - Max)

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PSU LED indicator
The indicators are the same for the control and expansion unit.
Figure 11-18 shows the PSU LED Indicators.
Figure 11-18 PSU LED Indicators
Table 11-9 shows the colors and meaning of the LEDs.
Table 11-9 PSU LED definitions
Position Color Marking Name Definition
1 Green In AC Status Main power is
delivered
2 Green DC DC Status DC power is
available
3 Amber Fault exclamation
mark
Fault Fault on PSU
4 Blue OK Service action
that is allowed
N/A

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11.3 Configuration backup procedure
If there is a serious failure that requires that the system configuration must be restored, the
configuration backup file must be used. The file contains configuration data such as arrays,
pools, and volumes (but no customer applications data). The backup file is updated by the
cluster daily.
Even so, it is important to save the file after you made changes to your system configuration.
This requires a command-line interface (CLI) connection to start a manual backup.
Download this file regularly to your management workstation to protect the configuration data
(a best practice is to automate this download procedure by using a script and save it every
day on a remote system).
11.3.1 Generating a configuration backup using the CLI
To generate a configuration backup by using the CLI, run the svcconfig backup command, as
shown in Example 11-1.
Example 11-1 Example for backup CLI command
svcconfig backup
The progress of the command is shown by advancing dots, as shown in Example 11-2.
Example 11-2 Backup CLI command progress and output
..................................................................................
..................................................................................
....................
CMMVC6155I SVCCONFIG processing completed successfully
The svcconfig backup command creates three files that provide information about the
backup process and cluster configuration. These files are created in the /tmp directory on the
configuration node and are listed on the support view.
The three files that are created by the backup process are described Table 11-10.
Table 11-10 File names that are created by the backup process
File name Description
svc.config.backup.xml This file contains your cluster configuration data.
svc.config.backup.sh This file contains the names of the commands that were
issued to create the backup of the cluster.
svc.config.backup.log This file contains details about the backup, including any
error information that might be reported.

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11.3.2 Downloading a configuration backup using the GUI
To download a configuration backup file by using the GUI, complete the following steps:
1.Click the Settings icon and then click Support, as shown in Figure 11-19.
Figure 11-19 Configuration backup open support view
2.Select the configuration node on the support view, as shown in Figure 11-20.
Figure 11-20 Configuration backup select configuration node
3.Select the Show full log listing... option (as shown in Figure 11-21) to list all of the
available log files that are stored on the configuration node.
Figure 11-21 Support package selection

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4.Search for a file named /dumps/svc.config.backup.xml_* (as shown in Figure 11-22).
Select the file, right-click it, and select Download.
Figure 11-22 Configuration backup start download
5.Save the configuration backup file on your management workstation (as shown in
Figure 11-23) where it can be found easily.
Figure 11-23 Configuration backup save file

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Even if the configuration backup file is updated automatically, it might be of interest to verify
the time stamp of the actual file. Therefore, the /dumps/svc.config.backup.xml_xx file must
be opened with an editor, such as WordPad, as shown in Figure 11-24.
Figure 11-24 Open backup XML file with WordPad
Open the /dumps/svc.config.backup.xml_xx file with an editor (we used WordPad) and
search for the string timestamp=, which is found near of the top of the file. Figure 11-25 shows
the file opened and the time stamp information in it.
Figure 11-25 Timestamp in backup XML file

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11.4 Software upgrade
The system upgrade process involves the upgrading of your entire IBM Storwize V3700
environment.
Allow up to a week to plan your tasks, review your preparatory upgrade tasks, and complete
the upgrade of the IBM Storwize V3700 environment. The upgrade procedures can be divided
into these general processes. Table 11-11 shows the software upgrade tasks.
Table 11-11 Software upgrade tasks
Some code levels support upgrades only from specific previous levels. If you upgrade to more
than one level above your current level, you might be required to install an intermediate level.
11.4.1 Upgrading software automatically
During the automatic upgrade process, each node in the system upgrades individually. While
the node is upgrading, it is temporarily unavailable and all I/O operations to that node fail. As
a result, the I/O error counts increase and the failed I/O operations are directed to the partner
node of the working pair. Applications do not see any I/O failures. While each node restarts,
there might be some degradation in the maximum I/O rate that can be sustained by the
system. After each of the nodes in the system are successfully restarted with the new code
level, the new level is automatically committed.
Sequence Upgrade tasks
1 Decide whether you want to upgrade automatically or manually. During an
automatic upgrade procedure, the clustered system upgrades each of the nodes
systematically. The automatic method is the preferred procedure for upgrading
software on nodes. However, you can upgrade each node manually.
2 Ensure that CIM object manager (CIMOM) clients are working correctly. When
necessary, upgrade these clients so that they can support the new version of IBM
Storwize V3700 code.
3 Ensure that multipathing drivers in the environment are fully redundant. If you
experience failover issues with multipathing driver support, resolve these issues
before you start normal operations.
4 Upgrade other devices in the IBM Storwize V3700 environment. Examples might
include upgrading hosts and switches to the correct levels.
5 Upgrade your IBM Storwize V3700.
Important: The amount of time it takes to perform an upgrade can vary depending on the
amount of preparation work that is required and the size of the environment.
Important: Ensure that you have no unfixed errors in the log and that the system date and
time are correctly set. Start the fix procedures, and ensure that you have fixed any
outstanding errors before you attempt to concurrently upgrade the code.

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When new nodes are added to the system, the upgrade package is automatically downloaded
to the new node from the IBM Storwize V3700 system.
The upgrade can be performed concurrently with normal user I/O operations. However,
performance can be affected.
Multipathing requirement
Before you upgrade, ensure that the multipathing driver is fully redundant with every path
available and online. You might see errors that are related to some of the paths failing and the
error count increases during the upgrade. This is a result of each node effectively going offline
to I/O while it upgrades and re-starts. When the node comes back, the paths become
available and fully redundant again. After a 30-minute delay, the paths to the other node go
down as that begins to upgrade.
11.4.2 GUI upgrade process
The automatic upgrade process begins by starting the upgrade wizard in a GUI, as shown in
Figure 11-26. Browse to Settings  General  Upgrade Software  Launch Upgrade
Wizard.
Figure 11-26 Start Upgrade wizard
As a first step, the upgrade test utility must be downloaded from the internet. The correct link
is provided within the panel. If the tool was downloaded and is stored on the management
station, it can be uploaded, as shown in Figure 11-27 on page 566.

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Figure 11-27 Download Upgrade test Utility
A confirmation panel (as shown in Figure 11-28) opens.
Figure 11-28 Upload test utility completed
The version to which the system should be upgraded must be entered next. By default, the
latest code level is shown, as shown in Figure 11-29.
Figure 11-29 Enter version to be checked by tool
Important: You must choose the correct code level because you cannot recheck this
information later. The version that is selected is used throughout the rest of the process.

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Figure 11-30 shows the panel that indicates the background test task is running.
Figure 11-30 Wait utility to complete
The utility can be run as many times as necessary on the same system to perform a
readiness check-in preparation for a software upgrade.
Next, the code must be downloaded to the management workstation. If the code was already
downloaded to the management station, it can be directly uploaded to the IBM Storwize
V3700, as shown in Figure 11-31. Verify that the correct code file is used.
Figure 11-31 Download Code
As shown in Figure 11-32, a confirmation window opens.
Figure 11-32 Code upload that is completed.
The automated code upgrade can be started when the Automatic upgrade option is selected
in the decision panel (as shown in Figure 11-33 on page 568), which is the default. If the
upgrade is done manually for any reason, the selection must be made (an automatic upgrade
is recommended).

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Figure 11-33 Upload mode decision
If you choose to select the Service Assistant Manual upgrade option, see to 11.4.3,
“Upgrading software manually” on page 568.
Selecting Finish starts the upgrade process on the nodes. Messages inform you when the
nodes are upgraded. When all nodes are rebooted, the upgrade process is complete. It can
take up to two hours to finish this process.
11.4.3 Upgrading software manually
The steps for manual upgrade are shown on the Service Assistant Manual Upgrade panel.
Complete the following steps to manually upgrade the software:
1.In the management GUI, click Settings  General  Upgrade Software and run the
Launch Upgrade wizard. In step 5 of the wizard, select Service Assistant Manual
upgrade, as shown in Figure 11-34.
Figure 11-34 Select manual upgrade mode
Important: It is highly recommended to upgrade the IBM Storwize V3700 automatically
following the upgrade wizard. If a manual upgrade is used, make sure that you do not skip
any step.

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After you select manual upgrade, a warning is shown, as shown in Figure 11-35.
Figure 11-35 Manual upgrade warning
Both nodes are set to status “Waiting for Upgrade” in the Upgrade Machine Code panel,
as shown in Figure 11-36.
Figure 11-36 Node status to waiting for upgrade
2.In the management GUI, select System Details and select the canister (node) you want
to upgrade next. As shown in Figure 11-37, select Remove Node in the Action menu,
which shows you an alert in Health Status.
Figure 11-37 Remove the non-config node from cluster
Important: Make sure you select the non-config node first.

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A warning message appears, as shown in Figure 11-38.
Figure 11-38 Remove node warning message
The non-config node is removed from GUI Upgrade Machine Code panel, as shown in
Figure 11-39.
Figure 11-39 Non-config node was removed
In the System Details panel, the node is shown as Unconfigured, as shown in
Figure 11-40.
Figure 11-40 Node status shows unconfigured
3.In the Service Assistant panel, the node that is ready for upgrade must be selected. Select
the node showing Node status as service mode and that has no available cluster
information, as shown in Figure 11-41.
Figure 11-41 Select node in service mode for upgrade

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4.In the Service Assistant panel, select Upgrade Manually and then select the machine
code version to which you want to upgrade, as shown in Figure 11-42.
Figure 11-42 Select machine code file for upgrade
5.Click Upgrade to start the upgrade process on the first node.
6.The node is automatically added to the system after upgrade. Upgrading and adding the
node can take up to 30 minutes, as shown in Figure 11-43.
Figure 11-43 Non-config node completed upgrade
7.Repeat steps 2 - 4 to the remaining node (or nodes).
After you remove config node from the cluster for upgrade, a warning appears, as shown
in Figure 11-44.
Figure 11-44 Config node failover warning

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8.To exit from service state, browse to the home panel of the Service Assistant and open the
Action menu. Select Exit Service State, as shown in Figure 11-45.
Figure 11-45 Exit service state to add node back in cluster
Both the nodes are now back into the cluster (as shown in Figure 11-46) and the system is
running on the new code level.
Figure 11-46 Cluster is active again and running new code level
Important: The config node remains in Service State when it is added again to the
cluster. Therefore, exit Service State manually.

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11.5 Event log
Whenever a significant change in the status of IBM Storwize V3700 is detected, an event is
logged in to the event log.
All events are classified as alerts or messages.
An alert is logged when the event requires some action. Some alerts have an associated
error code that defines the service action that is required. The service actions are automated
through the fix procedures. If the alert does not have an error code, the alert represents an
unexpected change in state. This situation must be investigated to see whether it is to be
expected or represents a failure. Investigate an alert and resolve it as soon as it is reported.
A message is logged when a change that is expected is reported; for instance, an IBM
FlashCopy operation completes.
The event log panel can be opened via the GUI by clicking Monitoring  Events, as shown
in Figure 11-47.
Figure 11-47 Open eventlog panel
When opened, the event log looks as shown in Figure 11-48.
Figure 11-48 The event log view

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11.5.1 Managing the event log
The event log has a size limit. After it is full, newer entries replace older entries that are not
required.
To avoid a repeated event that fills the event log, some records in the event log refer to
multiple occurrences of the same event. When event log entries are coalesced in this way, the
time stamp of the first occurrence and the last occurrence of the problem is saved in the log
entry. A count of the number of times that the error condition occurred also is saved in the log
entry. Other data refers to the last occurrence of the event.
Event log panel columns
Right-clicking in any column header raises the option menu to select columns that are shown
or hidden.
Figure 11-49 shows all of the possible columns that can be displayed in the error log view.
Figure 11-49 All possible event log columns
We describe the following available fields that are recommended at a minimum to assist you
in diagnosing the problems:
Event ID
This number precisely identifies the reason why the event was logged.
Error code
This number describes the service action that should be followed to resolve an error
condition. Not all events have error codes that are associated with them. Many event IDs
can have the same error code because the service action is the same.
Sequence number
A number that identifies the event.

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Event count
The number of events that are coalesced into this event log record.
Fixed
When an alert is shown for an error condition, it indicates whether the reason for the event
was resolved. In many cases, the system automatically marks the events that are fixed
when appropriate. There are some events that must be manually marked as fixed. If the
event is a message, this field indicates that you read and performed the action. The
message must be marked as read.
Last time
The time when the last instance of this error event was recorded in the log.
Root sequence number
If set, this number is the sequence number of an event that represents an error that
probably caused this event to be reported. Resolve the root event first.
Event log panel options
This panel shows the main Event log panel options, which should be used to handle system
events, as shown in Figure 11-50.
Figure 11-50 Eventlog Panel
Event log filter options
The following log filter options are available:
Show all
This option lists all available events.
Unfixed Messages and Alerts
This option lists unfixed events. This option is useful to find events that must be handled
but no actions are required or recommended.

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Recommended Actions (default)
Only events with recommended actions (Status Alert) are displayed.
Figure 9-51 shows an event log with no items found, which does not necessarily mean that
the event log is clear. We check whether the log is clear by using the filter option Show all.
Figure 11-51 No items found in event log
Actions on single event
Right-clicking a single event gives the following options that might be used for that specific
event:
Mark as Fixed
It is possible to start the Fix Procedure on this specific event, even if it is not the
recommended next action.
Some events, such as messages, must be set to Mark as Fixed.
Show entries within... minutes/hours/days
This option is to limit the error log list to a specific date or a time slot. The following
selectable values are available:
– Minutes: 1, 5, 10, 15, 30, and 45
– Hours: 1, 2, 5, and 12
– Days: 1, 4, 7, 15, and 30
Clear Log
This option clears the complete error log, even if only one event was selected.
Properties
This option provides more sense data for the selected event that is shown in the list.
Recommended Actions
A fix procedure is a wizard that helps you to troubleshoot and correct the cause of an error.
Some fix procedures reconfigure the system and are based on your responses. Ensure that
actions are carried out in the correct sequence to prevent or mitigate loss of data. For this
reason, you must always run the fix procedure to fix an error, even if the fix might seem
obvious.
Warning: Check for this filter option if no event is listed. There might be events that are
not associated to recommended actions.
Warning: These actions cannot be undone and might prevent the system from being
analyzed in the case of severe problems.

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To run the fix procedure for the error with the highest priority, go to the Recommended Action
panel at the top of the Event page and click Run This Fix Procedure. When you fix higher
priority events first, the system can often automatically mark lower priority events as fixed.
For more information about how to run a DMP, see 11.5.2, “Alert handling and recommended
actions” on page 577.
11.5.2 Alert handling and recommended actions
All events in Alert status require attention. Alerts are listed in priority order and should be
fixed sequentially by using the available fix procedures.
Example: SAS cable fault
For this example, we created an error on one SAS cable connection between two expansion
enclosures by removing the cable from one port.
The following example shows how faults are represented in the error log, how information
about the fault can be gathered, and the recommended action (DMP) can be used to fix the
error:
Detect an alert
The Health Status indicator, which is permanently present on most of the GUI panels (for
more information, see Chapter 3, “Graphical user interface overview” on page 73) is
showing a yellow alert. Click the indicator to retrieve the specific information, as shown in
Figure 11-52.
Figure 11-52 Health check shows degraded system status
Review the event log for more information.
Find alert in event log
The default filter in the error log view is Recommended actions. This option lists the alert
event only. Figure 11-53 shows the recommended action list.
Figure 11-53 Recommended action list

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Gather more information: Show all
Find the events that are logged around the alert to understand what happened or find
more information for better understanding and to find the original problem. Use the Show
all filter to see all of the logged events, as shown in Figure 11-54.
Figure 11-54 Show all events
Gather more information: Alert properties
More details about the event (for example, enclosure ID and canister ID) can be found in
the properties option, as shown in Figure 11-55 on page 579. This information might be of
interest for problem fixing or for root cause analysis.

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Figure 11-55 Alert properties
Run recommended action (DMP)
It is highly recommended to fix alerts under the guidance of the recommended action
(DMP). There are running tasks in the background that might be missed when the DMP is
bypassed. Not all alerts have DMPs available.
To start the DMP, right-click the alert record or click Run this fix procedure at the top of
the window.
The steps and panels of DMP are specific to the error that must be fixed. The following
figures represent the recommended action (DMP) for the SAS cable event example.

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Figure 11-56 shows the DMP SAS cable event step 1.
Figure 11-56 SAS cable Recommended action DMP step 1
Figure 11-57 shows the DMP SAS cable event step 2.
Figure 11-57 SAS cable Recommended action DMP step 2

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Figure 11-58 shows the DMP SAS cable event step 3.
Figure 11-58 SAS cable Recommended action DMP step 3
Figure 11-59 shows the DMP SAS cable event step 4.
Figure 11-59 SAS cable Recommended action DMP step 4

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Figure 11-60 shows the DMP SAS cable event step 5.
Figure 11-60 SAS cable Recommended action DMP step 5
Figure 11-61 shows the DMP SAS cable event step 6.
Figure 11-61 SAS cable Recommended action DMP step 6

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Figure 11-62 shows the DMP SAS cable event step 7.
Figure 11-62 SAS cable Recommended action DMP step 7
Figure 11-63 shows the DMP SAS cable event step 8
Figure 11-63 SAS cable Recommended action DMP step 8

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When all of the steps of the DMP are processed successfully, the recommended action is
complete and the problem should be fixed. Figure 11-64 shows the red color of the event
status changed to green. The system health status is green and there are no further alerts
that must be addressed.
Figure 11-64 Recommended action that is completed
Handling multiple alerts
If there are multiple alerts logged, the IBM Storwize V3700 recommends a next action to fix
the problem (or problems).
Figure 11-65 shows the event log that displays multiple alert.
Figure 11-65 Multiple alert events displayed in the event log
The Next Recommended Action function orders the alerts by severity and displays the events
with the highest severity first. If multiple events have the same severity, they are ordered by
date and the oldest event is displayed first.
The following order of severity starts with the most severe condition:
Unfixed alerts (sorted by error code; the lowest error code has the highest severity)
Unfixed messages

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Monitoring events (sorted by error code; the lowest error code has the highest severity)
Expired events
Fixed alerts and messages
Faults are often fixed with the fixing of the most severe fault.
11.6 Collecting support information
When you have a problem and call the IBM Support Center, you might be asked to provide
support data.
11.6.1 Support data via GUI
Click Settings and then the Support tab (as shown in Figure 11-66) to begin the procedure
of collecting support data.
Figure 11-66 Support Files VIA® GUI
Click Download Support Package, as shown in Figure 11-67
Figure 11-67 Download Support Package
The panel that is shown in Figure 11-68 opens and you can select one of four different
versions of the svc_snap support package.
Figure 11-68 Support Package Selection

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The version that you download depends on the event you are investigating. For example, if
you noticed a node was restarted in the event log, capture the snap with the latest existing
statesave.
The following components are included in the support package:
Standard logs
Contains the most recent logs that were collected from the system. These logs are most
commonly used by Support to diagnose and solve problems.
Standard logs plus one existing statesave
Contains the standard logs from the system and the most recent statesave from any of the
nodes in the system. Statesaves also are known as dumps or live dumps.
Standard logs plus most recent statesave from each node
This option is the mostly used by support team for problem analysis. They contain the
standard logs from system and the most recent statesave from each node in the system.
Standard logs plus new statesave
This option might be requested by the Support team for problem determination. It
generates a new statesave (livedump) for all of the nodes and packages them with the
most recent logs.
Save the resulting snap file in a directory for later usage or upload to IBM support.
11.6.2 Support information via Service Assistant
The IBM Storwize V3700 management GUI collects information from all the components in
the system. The Service Assistant collects information from all node canisters. The Snap file
is the information collected and packaged together in a single file.
If the package is collected by using the Service Assistant, ensure that the node from which
the logs are collected is the current node, as shown in Figure 11-69.
Figure 11-69 Collect logs with Service Assistance

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Support information can be downloaded with or without the latest statesave, as shown in
Figure 11-70.
Figure 11-70 Download support file via Service Assistant
11.6.3 Support Information onto USB stick
Whenever GUI, Service Assistant, or a remote connection is not available, it is possible to
collect snaps from each single node by using the USB stick.
Complete the following steps to collect snaps by using the USB stick:
1.Create a text file that includes the following command:
satask snap -dump
2.Save the file as satask.txt in the root directory of the USB stick.
3.Insert the USB stick in the USB port of the node from which the support data should be
collected.
4.Wait until no write activities are recognized (this process can take 10 minutes or more).
5.Remove the USB stick and check the results, as shown in Figure 11-71.
Figure 11-71 Single snap result files on USB stick

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satask_result file
The satask_result.html file is the general response to the command that is issued via the
USB stick. If the command did not run successfully, it is shown in this file. Otherwise, any
general system information is stored here, as shown in Figure 11-72.
Figure 11-72 satask_result.txt on USB stick
Snap dump on USB
A complete statesave of the node where the USB was attached is stored in a.zip file. The
name of the file includes the node name and the time stamp. The content of the .zip file is
shown in Figure 11-73.
Figure 11-73 Single snap dump on USB stick
11.7 Powering on and shutting down IBM Storwize V3700
In the following sections, we describe the process to power on and shut down the IBM
Storwize V3700 system by using the GUI and the CLI.
11.7.1 Shutting down the system
In this section, we show how to shut down the IBM Storwize V3700 system by using the GUI
and CLI.
Important: You should never shut down your IBM Storwize V3700 by powering off the
PSUs, removing both PSUs, or removing both power cables from a running system.

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Powering down by using the GUI
You can shut down only one node canister or the entire cluster. When you shut down only one
node canister, all of the activities remain active. When you shut down the entire cluster, you
must power on locally to restart the system.
To shut down by using the GUI, complete the following steps:
1.Browse to Monitoring function icon (as shown in Figure 11-74) and click System Details.
Figure 11-74 Power down via system details
2.Select the root level of the system detail tree, click Actions and select Shut Down
System, as shown in Figure 11-75.
Figure 11-75 Power Down System option

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The following process can be used as an alternative to step 1 and step 2, as shown in
Figure 11-76:
a.Browse to the Monitoring navigator and open the System view.
b.Click the system that is under the system display.
c.An information panel opens. Click the Manage tab.
d.Click Shut Down System to shut down, as shown in Figure 11-76.
Figure 11-76 Shut down system via Monitoring system GUI
3.The Confirm System Shutdown window opens. A message opens and prompts you to
confirm whether you want to shut down the cluster. Ensure that you stopped all FlashCopy
mappings, data migration operations, and forced deletions before you continue. Enter Yes
and click OK to begin the shutdown process, as shown in Figure 11-77.
Figure 11-77 Shut Down confirmation
4.Wait for the power LED on both node canisters in the control enclosure to flash at 1 Hz,
which indicates that the shutdown operation completed (1 Hz is half as fast as the drive
indicator LED).

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Shutting down by using the command-line interface
The use of the CLI is the other option to shut down an IBM Storwize V3700 and the PuTTY
utility.
Run the stopsystem command to shut down a clustered system, as shown in Example 11-3.
Example 11-3 Shut down
stopsystem
Are you sure that you want to continue with the shut down?
# Type y to shut down the entire clustered system.
11.7.2 Powering on
Complete the following steps to power on the system:
1.Ensure that any network switches that are connected to the system are powered on.
2.Power on any expansion enclosures by connecting the power cord to both power supplies
in the rear of the enclosure or turning on the power circuit.
3.Power on the control enclosure by connecting the power cords to both power supplies in
the rear of the enclosure and turning on the power circuits.
The system starts. The system starts successfully when all node canisters in the control
enclosure have their status LED permanently on, which should take no longer than 10
minutes.
4.Start the host applications.
Tip: When you shut down an IBM Storwize V3700, it does not automatically restart. You
must manually restart the system.
Warning: If you are shutting down the entire system, you lose access to all volumes that
are provided by this system. Shutting down the system also shuts down all IBM Storwize
V3700 nodes. This shutdown causes the hardened data to be dumped to the internal hard
disk drive.
Important: This process assumes all power is removed from the enclosure. If the control
enclosure is shut down but the power is not removed, the power LED on all node canisters
flash at a rate of half of one second on, half of one second off. In this case, remove the
power cords from both power supplies and then reinsert them.

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© Copyright IBM Corp. 2013. All rights reserved.
593
Appendix A.
Command-line interface setup
and SAN Boot
This appendix describes the setup of the command-line interface (CLI) and provides more
information about the SAN Boot function.
A

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Command-line interface
The IBM Storwize V3700 system has a powerful CLI, which offers even more functions than
the GUI. This section is not intended to be a detailed guide to the CLI because that topic is
beyond the scope of this book. The basic configuration of the IBM Storwize V3700 CLI and
some example commands are covered. However, the CLI commands are the same as in the
IBM SAN Volume Controller. In addition, there are more commands that are available to
manage internal storage. If a task completes in the GUI, the CLI command is always
displayed in the task box detail, as shown throughout this book.
Detailed CLI information is available in the IBM Storwize V3700 Information Center under the
Command Line section, which can be found at this website:
http://pic.dhe.ibm.com/infocenter/storwize/V3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.V3700.641.doc%2Fsvc_clicommandscontainer_229g0r.html
Implementing the IBM Storwize V7000 V6.3, SG24-7938 also has information about the use
of the CLI. The commands in that book also apply to the IBM Storwize V3700 system.
Basic setup
In the IBM Storwize V3700 GUI, authentication is done using a user name and password. The
CLI uses a Secure Shell (SSH) to connect from the host to the IBM Storwize V3700 system. A
private and public key pair or user name and password is necessary. The following steps are
required to enable CLI access with SSH keys:
1.A public key and private key are generated as a pair.
2.A public key is uploaded to the IBM Storwize V3700 system using the GUI.
3.A client SSH tool must be configured to authenticate with the private key.
4.A secure connection can be established between the client and IBM Storwize V3700
system.
Secure Shell is the communication vehicle that is used between the management workstation
and the IBM Storwize V3700 system. The SSH client provides a secure environment from
which to connect to a remote machine. It uses the principles of public and private keys for
authentication.
SSH keys are generated by the SSH client software. The SSH keys include a public key,
which is uploaded and maintained by the clustered system, and a private key, which is kept
private on the workstation that is running the SSH client. These keys authorize specific users
to access the administration and service functions on the system. Each key pair is associated
with a user-defined ID string that can consist of up to 40 characters. Up to 100 keys can be
stored on the system. New IDs and keys can be added, and unwanted IDs and keys can be
deleted. To use the CLI, an SSH client must be installed on that system, the SSH key pair
must be generated on the client system, and the client’s SSH public key must be stored on
the IBM Storwize V3700 systems.
The SSH client that is used in this book is PuTTY. There is also a PuTTY key generator that
can be used to generate the private and public key pair. The PuTTY client can be downloaded
at no cost from the following website:
http://www.chiark.greenend.org.uk
Download the following tools:
PuTTY SSH client: putty.exe

Appendix A. Command-line interface setup and SAN Boot
595
PuTTY key generator: puttygen.exe
Generating a public and private key pair
To generate a public and private key pair, complete the following steps:
1.Start the PuTTY key generator to generate the public and private key pair, as shown in
Figure A-1.
Figure A-1 PuTTY key generator
Make sure that the following options are selected:
– SSH2 RSA
– Number of bits in a generated key: 1024
2.Click Generate and move the cursor over the blank area to generate the keys, as shown in
Figure A-2.

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Figure A-2 Generate keys
3.After the keys are generated, save them for later use. Click Save public key, as shown in
Figure A-3.
Figure A-3 Save public key
4.You are prompted for a name (for example, pubkey) and a location for the public key (for
example, C:\Support Utils\PuTTY). Click Save.
To generate keys: The blank area that is indicated by the message is the large blank
rectangle on the GUI inside the section of the GUI labeled Key. Continue to move the
mouse pointer over the blank area until the progress bar reaches the far right side. This
action generates random characters to create a unique key pair.

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597
Ensure that you record the name and location of this SSH public key as it must be
specified later.
5.Click Save private key, as shown in Figure A-4.
Figure A-4 Save private key
6.You receive a warning message, as shown in Figure A-5. Click Yes to save the private key
without a passphrase.
Figure A-5 Confirm the security warning
7.When prompted, enter a name (for example, icat), select a secure place as the location,
and click Save.
8.Close the PuTTY key generator.
Public key extension: By default, the PuTTY key generator saves the public key with
no extension. Use the string pub for naming the public key; for example, pubkey, to
differentiate the SSH public key from the SSH private key.
Key generator: The PuTTY key generator saves the private key with the PPK
extension.

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Uploading the SSH public key to the IBM Storwize V3700
After you create your SSH key pair, you must upload your SSH public key onto the IBM
Storwize V3700 system. Complete the following steps to upload the key:
1.Open the user section, as shown in Figure A-6.
Figure A-6 Open user section
2.Right-click the user for which you want to upload the key and click Properties, as shown in
Figure A-7.
Figure A-7 Superuser properties
3.To upload the public key, click Browse, select your public key, and click OK, as shown in
Figure A-8.

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Figure A-8 Select public key
4.Click OK and the key is uploaded, as shown in Figure A-9.
Figure A-9 Public key upload complete
5.Click Close to return to the GUI.

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Configuring the SSH client
Before the CLI can be used, the SSH client must be configured. Complete the following steps
to configure the client:
1.Start PuTTY, as shown in Figure A-10.
Figure A-10 PuTTY
In the right side pane under the “Specify the destination you want to connect to” section,
select SSH. Under the “Close window on exit” section, select Only on clean exit, which
ensures that if there are any connection errors, they are displayed in the user’s window.
2.From the Category pane on the left side of the PuTTY Configuration window, click
Connection  SSH to open the PuTTY SSH Configuration window, as shown in
Figure A-11.

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601
Figure A-11 SSH protocol version 2
3.In the right side pane, in the “Preferred SSH protocol version” section, select 2.
4.From the Category pane on the left side of the PuTTY Configuration window, click
Connection  SSH  Auth. As shown in Figure A-12, in the right side pane, in the
“Private key file for authentication:” field under the Authentication Parameters section,
browse to or manually enter the fully qualified directory path and file name of the SSH
client private key file that was created earlier (for example, C:\Support
Utils\PuTTY\icat.PPK).

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Figure A-12 SSH authentication
5.From the Category pane on the left side of the PuTTY Configuration window, click
Session to return to the Session view, as shown in Figure A-10 on page 600.
6.In the right side pane, enter the host name or system IP address of the IBM Storwize
V3700 clustered system in the Host Name field, and enter a session name in the Saved
Sessions field, as shown in Figure A-13.
Figure A-13 Enter session information

Appendix A. Command-line interface setup and SAN Boot
603
7.Click Save to save the new session, as shown in Figure A-14.
Figure A-14 Save Session
8.Highlight the new session and click Open to connect to the IBM Storwize V3700 system.
9.PuTTY now connects to the system and prompts you for a user name. Enter superuser as
the user name and press Enter (see Example A-1).
Example: A-1 Enter user name
login as: superuser
Authenticating with public key "rsa-key-20130521"
Last login: Tue May 21 15:21:55 2013 from 9.174.219.143
IBM_Storwize:mcr-atl-cluster-01:superuser>
The CLI is now configured for IBM Storwize V3700 administration.
Example commands
A detailed description about all of the available commands is beyond the scope of this book.
In this section, sample commands are presented that we referenced in this book.
The svcinfo and svctask prefixes are no longer needed in IBM Storwize V3700. If you have
scripts that use this prefix, they run without problems. If you enter svcinfo or svctask and
press the Tab key twice, all of the available subcommands are listed. Pressing the Tab key
twice also auto-completes commands if the input is valid and unique to the system.
Enter lsvdisk, as shown in Example A-2, to list all configured volumes on the system. The
example shows that six volumes are configured.
Example: A-2 List all volumes
IBM_Storwize:mcr-atl-cluster-01:superuser>lsvdisk

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id name IO_group_id IO_group_name status mdisk_grp_id mdisk_grp_name
capacity type FC_id FC_name RC_id RC_name vdisk_UID opy_count
fast_write_state se_copy_count RC_change compressed_copy_count
0 V3700_Vol1 0 io_grp0 online 0 V3700_Pool
20.00GB striped 6005076300800 empty
1 no 0
1 V3700_Vol2 0 io_grp0 online 0 V3700_Pool
2.00GB striped 6005076300800 empty
1 no 0
2 V3700_Vol3 0 io_grp0 online 0 V3700_Pool
2.00GB striped 6005076300800 empty
1 no 0
3 V3700_Vol4 0 io_grp0 online 0 V3700_Pool
2.00GB striped 6005076300800 empty
1 no 0
4 V3700_Vol5 0 io_grp0 online 0 V3700_Pool
2.00GB striped 6005076300800 empty
1 no 0
5 V3700_Vol6 0 io_grp0 online 0 V3700_Pool
2.00GB striped 6005076300800 empty
1 no 0
Enter lshost to see a list of all configured hosts on the system, as shown in Example A-3.
Example: A-3 List hosts
IBM_Storwize:mcr-atl-cluster-01:superuser>lshost
id name port_count iogrp_count status
0 windows2008r2 2 4 online
To map the volume to the hosts, enter mkvdiskhostmap, as shown in Example A-4.
Example: A-4 Map volumes to host
IBM_Storwize:mcr-atl-cluster-01:superuser
>mkvdiskhostmap -host ESXi-1 -scsi 0 -force
ESXi-Redbooks
Virtual Disk to Host map, id [0], successfully created
To verify the host mapping, enter lsvdiskhostmap, as shown in Example A-5.
Example: A-5 List all hosts mapped to a volume
IBM_Storwize:mcr-atl-cluster-01:superuser>lshostvdiskmap ESXi-1
id name SCSI_id vdisk_id vdisk_name vdisk_UID
4 ESXi-1 0 2 ESXi-Redbooks 600507680185853FF000000000000011
In the CLI, there are more options available than in the GUI. All advanced settings can be set;
for example, I/O throttling. To enable I/O throttling, change the properties of a volume by using
the changevdisk command, as shown in Example A-6). To verify the changes, run the
lsvdisk command.

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605
Example: A-6 Enable advanced properties: I/O throttling
IBM_Storwize:mcr-atl-cluster-01:superuser>chvdisk -rate 1200 -unit mb
ESXi-Redbooks
IBM_Storwize:mcr-atl-cluster-01:superuser>
IBM_Storwize:mcr-atl-cluster-01:superuser>lsvdisk ESXi-Redbooks
id 2
name ESXi-Redbooks
.
.
vdisk_UID 600507680185853FF000000000000011
virtual_disk_throttling (MB) 1200
preferred_node_id 2
.
.
IBM_Storwize:mcr-atl-cluster-01:superuser>
If you do not specify the unit parameter, the throttling is based on I/Os instead of throughput,
as shown in Example A-7.
Example: A-7 Throttling based on I/O
IBM_Storwize:mcr-atl-cluster-01:superuser>chvdisk -rate 4000 ESXi-Redbooks
IBM_Storwize:mcr-atl-cluster-01:superuser>lsvdisk ESXi-Redbooks
id 2
name ESXi-Redbooks
.
.
vdisk_UID 600507680185853FF000000000000011
throttling 4000
preferred_node_id 2
.
.
IBM_Storwize:mcr-atl-cluster-01:superuser>
To disable I/O throttling, set the I/O rate to 0, as shown in Example A-8.
Example: A-8 Disable I/O Throttling
IBM_Storwize:mcr-atl-cluster-01:superuser>chvdisk -rate 0 ESXi-Redbooks
IBM_Storwize:mcr-atl-cluster-01:superuser>lsvdisk ESXi-Redbooks
id 2
.
.
vdisk_UID 600507680185853FF000000000000011
throttling 0
preferred_node_id 2
IBM_Storwize:mcr-atl-cluster-01:superuser>
Command output: The lsvdisk command lists all available properties of a volume and its
copies. To make it easier to read, lines in Example A-6 were deleted.

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SAN Boot
IBM Storwize V3700 supports SAN Boot for Windows, VMware, and many other operating
systems. SAN Boot support can change, so regularly check the IBM Storwize V3700
interoperability matrix at this website:
http://www.ibm.com/support/docview.wss?uid=ssg1S1004111
The IBM Storwize V3700 Information Center has more information about SAN Boot for
different operating systems. For more information, see this website:
http://pic.dhe.ibm.com/infocenter/storwize/v3700_ic/index.jsp?topic=%2Fcom.ibm.sto
rwize.v3700.710.doc%2Fsvc_hostattachmentmain.html
For more information about SAN Boot, see the IBM System Storage Multipath Subsystem
Device Driver User's Guide, GC52- 1309-03, which can be found at this website:
ftp://ftp.software.ibm.com/storage/subsystem/UG/1.8--3.0/SDD_1.8--3.0_User_Guide_E
nglish_version.pdf
Enabling SAN Boot for Windows
Complete the following steps to install Windows host by using SAN Boot:
1.Configure the IBM Storwize V3700 system so that only the boot volume is mapped to the
host.
2.Configure the Fibre Channel SAN so that the host sees only one IBM Storwize V3700
system node port. Multiple paths during installation are not supported.
3.Configure and enable the host bus adapter (HBA) BIOS.
4.Install the operating system using the normal procedure and select the volume as the
partition on which to install.
5.Install SDDDSM after the installation completes.
6.Modify your SAN zoning to allow multiple paths.
7.Check your host to see whether all paths are available.
8.Set redundant boot devices in the HBA BIOS to allow the host to boot when its original
path fails.
Enabling SAN Boot for VMware
Complete the following steps to install a VMware ESXhost by using SAN Boot:
1.Configure the IBM Storwize V3700 system so that only the boot volume is mapped to the
host.
2.Configure the Fibre Channel SAN so that the host sees only one IBM Storwize V3700
system node port. Multiple paths during installation are not supported.
3.Configure and enable the HBA BIOS.
4.Install the operating system using the normal procedure and select the volume as the
partition on which to install.
HBAs: You might need to load another HBA device driver during installation, depending
on your Windows version and the HBA type.

Appendix A. Command-line interface setup and SAN Boot
607
5.Modify your SAN zoning to allow multiple paths.
6.Check your host to see if all paths are available and modify the multipath policy, if required.
Windows SAN Boot migration
If you have a host that runs a Windows 2000 Server, Windows Server 2003, or Windows
Server 2008 operating system, and have existing SAN Boot images that are controlled by
storage controllers, you can migrate these images to image-mode volumes that are controlled
by the IBM Storwize V3700 system.
Complete the following steps to migrate your existing SAN Boot images:
1.If the existing SAN Boot images are controlled by an IBM storage controller that uses the
IBM Subsystem Device Driver (SDD) as the multipathing driver, you must use SDD V1.6
or higher. Run the SDD datapath set bootdiskmigrate 2076 command to prepare the
host for image migration. See the Multipath Subsystem Device Driver (SDD) matrix to
download packages at this website:
http://www.ibm.com/support/docview.wss?rs=540&context=ST52G7&dc=DA400&uid=ssg1S
7001350&loc=en_US&cs=utf-8&lang=en#WindowsSDD
2.Shut down the host.
3.Complete the following configuration changes on the storage controller:
a.Write down the SCSI LUN ID each volume is using (for example, boot LUN SCSI ID 0,
Swap LUN SCSI ID 1, and Database Lun SCSID 2).
b.Remove all of the image-to-host mappings from the storage controller.
c.Map the existing SAN Boot image and any other disks to the
IBM Storwize V3700 system.
4.Change the zoning so that the host can see the IBM Storwize V3700 I/O group.
5.Complete the following configuration changes on the IBM Storwize V3700 system:
a.Create an image mode volume for the managed disk (MDisk) that contains the SAN
Boot image. Use the MDisk unique identifier to specify the correct MDisk.
b.Create a host object and assign the host HBA ports.
c.Map the image mode volume to the host using the same SCSI ID as before. For
example, you might map the boot disk to the host with SCSI LUN ID 0.
d.Map the swap disk to the host, if required. For example, you might map the swap disk
to the host with SCSI LUN ID 1.
6.Change the boot address of the host by completing the following steps:
a.Restart the host and open the HBA BIOS utility of the host during the booting process.
HBAs: You might need to load another HBA device driver during installation, depending
on your ESX level and the HBA type.
SAN Boot procedures: For more information about SAN Boot procedures for other
operating systems, see the IBM Storwize V3700 Information Center at this website:
http://pic.dhe.ibm.com/infocenter/storwize/V3700_ic/index.jsp?topic=%2Fcom.ibm.
storwize.V3700.641.doc%2FV3700_ichome_641.html

608
Implementing the IBM Storwize V3700
b.Set the BIOS settings on the host to find the boot image at the worldwide port name
(WWPN) of the node that is zoned to the HBA port.
7.If SDD V1.6 or higher is installed and you ran the bootdiskmigrate command in step 1,
reboot your host, update SDDDSM to the latest level, and go to step 14. If SDD V1.6 is not
installed, go to step 8.
8.Modify the SAN Zoning so that the host sees only one path to the IBM Storwize V3700.
9.Boot the host in single-path mode.
10.Uninstall any multipathing driver that is not supported for IBM Storwize V3700 system.
11.Install SDDDSM.
12.Restart the host in single-path mode and ensure that SDDDSM was properly installed.
13.Modify the SAN Zoning to enable multipathing.
14.Rescan drives on your host and check that all paths are available.
15.Reboot your host and enter the HBA BIOS.
16.Configure the HBA settings on the host. Ensure that all HBA ports are boot-enabled and
can see both nodes in the IBM Storwize V3700 I/O group that contains the SAN Boot
image. Configure the HBA ports for redundant paths.
17.Exit the BIOS utility and finish starting the host.
18.Map any other volumes to the host, as required.

© Copyright IBM Corp. 2013. All rights reserved.
609
Related publications
The publications listed in this section are considered particularly suitable for a more detailed
discussion of the topics that are covered in this book.
IBM Redbooks
The following IBM Redbooks publications provide more information about the topics in this
book. Some publications that are referenced in the following list might be available in softcopy
only:
Implementing the IBM System Storage SAN Volume Controller V6.3, SG24-7933
Implementing the IBM Storwize V7000 V6.3, SG24-7938
SAN Volume Controller: Best Practices and Performance Guidelines, SG24-7521
Implementing an IBM/Brocade SAN with 8 Gbps Directors and Switches, SG24-6116
You can search for, view, download, or order these documents and other Redbooks,
Redpapers, Web Docs, draft, and other materials, at the following website:
http://www.ibm.com/redbooks
IBM Storwize V3700 publications
Storwize V3700 publications are available at this website:
https://ibm.biz/BdxyDL
IBM Storwize V3700 support
Storwize V3700 support is available at this website:
https://ibm.biz/BdxyD9
Help from IBM
IBM Support and downloads
https://ibm.com/support
IBM Global Services
https://ibm.com/services

610
Implementing the IBM Storwize V3700

© Copyright IBM Corp. 2013. All rights reserved.
611
Index
A
active-active architecture 12
Advance FlashCopy menu 473
Advanced Settings 179, 182, 468
alerts 16, 27, 66, 494
algorithms 14
aliases 20
analyses 433–434, 459, 544
architecture 1, 12, 544
arrays 13–14
asynchronous replication 521
authentication 158, 184, 594, 601–602
Authentication Parameters 601
auto-complete
commands 603
autoexpand 21
autoexpansion 21
automatic data placement 417
B
background copies 130, 453–455, 460, 482–483, 512,
517
bandwidth 517
background copy rate 453–454, 460
backup copy rate 454
backups 25, 29, 449, 457, 460, 465, 502
application data 13
FlashCopy 450, 459
image 4
management IP address 34
system configuration data 13
tape 450, 458
volumes 460, 465
bandwidth 30, 130, 505, 512, 517–518
batteries 10
bitmaps 452, 457
boot 154
C
cache 16, 412, 454–455, 503–504
Call Home 25
email 24–25
candidate 320, 329
canisters 10, 28, 34, 152, 499, 544
expansion 10
slots 8
capacity 195
cold data 435
configurable warning 21
current internal storage 317
free 197
hot data 435
pools 201
real 21, 195, 197
solid-state disks 413
storage 2, 15, 317, 453
thin provisioned volumes 460
used 16, 21
used free 21
virtual 21, 195, 197
volumes 15, 206, 348, 434, 511
warning 21
Cascaded FlashCopy
mappings 453
chains 3, 30, 500
CHAP 369
chat sessions 24
CIMOM 13
clones 3, 453, 464, 466, 469
clusters 13, 17, 31, 198
allowed 502
auxiliary 509–510
background copy rate 130
backups 560
configuration 28, 560
data 560
configuration nodes 12
creating 45
error logging 544
extent sizes 16
FlashCopy consistency groups per cluster 460
FlashCopy mappings per cluster 459
host mappings 4
I/O groups 12
Image Mode volumes 18
inactive 502
internal storage 4
IP addresses 25, 29, 34, 221, 243, 602
local 502
management 4, 35, 38
master 509–510
master and auxiliary 509–510
MDisks 4
data 18
network 502
node canisters 544
number of Remote Copy consistency groups per clus-
ter 511
partnerships 501, 511, 515, 517
primary 509–510, 539
primary and secondary 510
public keys 594
remote 501–502
secondary 509–510
shutdown 589–590
colliding writes 511
command-line interface (CLI) 13, 24–25, 38, 40, 427,
459, 504, 560, 588, 593–594, 600, 603–604

612
Implementing the IBM Storwize V3700
commands 19, 38, 456–457, 508, 560, 594, 603
concepts 544
configuration 189, 238, 258
access redundancy 28
advanced host 210
backups 560–561
basic 594
basic volumes 213
changes 607
cluster activity 12
clusters 13
data 560
Easy Tier 418
enabling 185
FlashCopy 467
hosts 176
initial 50
IP addresses for Ethernet ports 34–35
issues 25
Metro Mirror
limits 511
nodes 9, 12, 34–35, 560
options 3
recommended storage 330
steps 27
storage controller changes 607
supported HBA driver 153, 162
system changes 560
system restore 560
tasks 13
wizards 177, 181, 187, 329
Configuration tab 157
connectivity
IBM Storwize V7000 and Brocade SAN Switches and
Directors 31
iSCSI 183
iSCSI Ethernet ports 183
consistency
point in time 456
consistency groups 129, 452, 456, 459, 471, 476,
489–495, 508, 510, 521, 531, 537–542
empty 491, 509
Consistency Groups menu 489
Consistency Groups window 460, 490
consistent
copies 512
data set 451
image 457, 505, 509
relationship 512
ConsistentDisconnected 510
ConsistentStopped 509
ConsistentSynchronized 509
containers 348
contingency 21
capacity 21
control enclosures 3, 8–10, 28, 30
state information 9
Copied state 454, 457
copies
primary 20, 198, 417
splitting 20
copy
bandwidth 517
operations 22, 458, 460
processes 130, 455, 509, 512, 517
rate 130, 453–454, 460, 482–483, 512
copy processes
stopping 455
Copy Services 460–463, 489, 515
copy services
functions 449
Copying state 455, 457, 477, 480, 512
creating
advanced FlashCopy mappings 476
Fibre Channel hosts 180
HP/UX or TPGS hosts 179
partnerships 499, 511
Remote Copy relationships 521, 524
Reverse FlashCopy mappings 459
second host 180
second hosts 180
thin-provisioned volumes 195
volume copies 189
volumes and FlashCopy mappings 3
Critical Fix Notification 573
D
data
analyses 413
application 13, 505, 560
backup 13
client 457
cluster configuration 13
configuration 560
consistency 510
consistent copy 512
error-related 25
hot 411, 417, 433
loss 192, 320
master volume 523
MDisks 18, 344
memory dumps 544
migration 18, 413, 590
mirrored 327
mirrored volumes 20
movement 417
performance 433
placement 411–412
production 460, 502
protection 560
read and write 4, 455
recording medium 4
relocation 412
sets 456
sources 457–458
striped 14, 557
support 585
transmitting and receiving load 544
workload performance 413
Data Migration Planner 415

Index
613
Data Migrator 415
Data Placement Advisor (DPA) 415
database
integrity 457
date and time 37, 50, 427
decoupled 17
default location 427
delete
consistency groups 541
FlashCopy mappings 460, 481
mappings 455
partnerships 129, 519
deleting 20
dependent writes 456–457
detected
hardware issues 55, 66
software failures 544
device-specific modules (DSM) 154
Directed Maintenance Procedure (DMP) 318, 415
disk drive types 11
drives 5, 608
3.5-inch 557
dependent 322
disk 8, 10, 30
enclosures 3–4
failure 13–14, 327
fast SAS or FC 413
faults 14
hard disk 411
hot spare 331
internal 3–4, 13, 315, 318, 320, 330
objects 13
overview 316
logical 38
expanding 38
MDisks 344, 347, 352
mirrored 14
pairs 14, 327
RAID arrays 557
slots 5
solid-state 412, 419–420, 422–423, 433–434
spare 320
E
Easy Tier 411
Automatic Data Placement Mode 416
enabling 428
enabling and disabling 425
enabling or disabling 431
evaluation mode 429, 433
extent migration 417
hot spots 417
internal volumes 413
log files 427
measurements 427
operating modes 416
overview 412
performance data 433
process 414
SSD 327, 334, 420–421
states 418
statuses 424
enclosures 4, 28, 555, 557–558
chains 3
expansion 4, 10, 28–30, 555
errors
asynchronous notification 544
cluster logging 544
ConsistentStopped state 509
hardware 455
I/O 458
partnership candidates 517
service panel 544
svc.config.backup.log 560
Ethernet
cabling 28
LED statuses 546
ports 28, 34–35, 546
switches 19
EUIs 12
events 3
alerts 27
definition 4
detected 24
disaster 13
extended logging 165
failure 4
logs 586
node canisters 35
notifications 24, 66, 544
offline fabrics 30
site power failure 544
SNMP traps 24
svc_snap files 586
syslog messages 25
expansion enclosures 316
extended unique identifiers 12
extents 16, 412
allocation 414
cold 414
Easy Tier 412, 433
hot 414, 417, 434–435
I/O activity 417
level 412
mappings 18
MDisks 15, 21
migration 411, 413, 416–417, 426
migration plans 412
real capacity 195
sizes 15–16, 20
striped volumes 17
external storage
MDisks 340
ports 30
F
fabric 4
errors 502
Fibre Channel ports 28
links 502

614
Implementing the IBM Storwize V3700
remote 511
WWPN zones 30
failed 320
failover situation 503
failovers 12, 34, 152, 505
fault-tolerant controller 9
Fibre Channel
ports 28, 511
FlashCopy 38, 195, 450–451
capabilities 38
commands 456–457
consistency group
states
Prepared 457
Preparing 457
Stopped 458
consistency groups 457, 489–490
states 457
Suspended 457
copy services 449
database volumes 456
integrity 456
mapping
states 454
Idling/Copied 456
Prepared 455
Preparing 455
Stopped 455
Suspended 455
mapping states
Stopped 477, 494
mappings 3, 452, 454, 456–457, 459–460, 471–472,
477, 479–480, 490–492, 494–495, 590
creating 467
deleting 480–481
dependency tree 482
renaming 479
operations 459–460
properties 459
Remote Copy 512
thin provisioning 21
volumes
multiple target 453
target 457, 477–478, 480, 482, 503, 510
FlashCopy Mapping window 476
FlashCopy Mappings menu 462
flexibility 333
foreground I/O latency 517
G
Global Mirror 23, 498, 504–505, 509–510, 521
relationships 512
gminterdelaysimulation 504
gmintradelaysimulation 504
grains 197, 452
granularity 451
H
hardware failures 25
HBAs
BIOS 37, 153, 606
installing 153, 164
port connection 36
ports 607–608
heat maps 414
high availability 198
Host Type setting 369
hosts 189
adding ports 373
clusters 37
configuration 176
configured and mapped
overview 214
creating 176
details 215, 221, 233, 241, 253
ESX 166, 174
Fibre Channel 232–233, 240, 252–253
iSCSI 174, 241
Fibre Channel 176
connections 30
Windows 2008 215, 228
I/O 452
initiator names 181
iSCSI 182, 222
iSCSI access 28, 34
iSCSI CHAP Secret 369
manual mapping process 207
mappings 4, 186, 189, 207, 209, 212–213, 215, 221,
229
verifying 604
mirrored volumes 198
names 20, 181
paths 573
ports 30, 178
WWPNs 177, 187
rebooting 223
renaming 369
servers 12, 21, 164, 195
systems 4, 12, 14–15, 17, 20, 152–153, 164–166
TPGS 179
unmapping 360
virtual capacity 195
volumes access 36, 219
Windows 606
Windows 2008 153, 156–157, 216, 218, 229, 231
iSCSI 161, 218, 220, 227, 231
WWPNs 30
hot spare 13, 317, 320, 420, 557
I
I/O groups 9, 12, 242, 511, 556, 607–608
I/O Monitoring (IOM) 415
I/O statistics 417, 431
IBM Assist On-site
restricting access 24
IBM Assist On-site tool 24
IBM SAN Volume Contoller (SVC) 568, 594, 598
IBM Storage Tier Advisor Tool (STAT) 414, 433
IBM Storwize V7000 177, 187

Index
615
amber fault LED 45
architecture 1
basic volume configuration 189
Call Home configuration 66
command-line interface 41, 594
components 12
configuration instructions 36
control enclosures 8
copy services 449
creating generic volumes 192
creating mirrored volumes 198
creating new partnerships 516
disk subsystems 557
downloading and installing supported firmware 164
Easy Tier
configuration using the CLI 427
overview 412
rules 417
FlashCopy
concepts 451
guidelines for implementation 459
mapping states 455
GUI 3, 15, 24, 26, 38, 156, 166, 174
creating hosts 151, 213
Easy Tier configuration 419
managing and configuring Remote Copy 515
managing and implementing Remote Copy 498
managing FlashCopy 460
overview 73
hardware installation planning 28, 61
hardware overview 7
host configuration 151
planning 36
Information Center 158
initial configuration 27, 38, 50
initiator 222
internal storage 2
iSCSI 19–20
connections 161
overview 184
LAN configuration planning 34
management 13
GUI 3
models 5
monitoring host paths 573
multipathing 155
multitiered storage pools 16
overview 1
performance optimized setup 334
ports
login maximums 31
provisioning storage 190
RAID 2
supported levels 557
RAS 544
Remote Copy
general guidelines 510
partnerships 499
synchronous and asynchronous 23
renaming target volumes 478
SAN
configuration planning 30
requirements 31
SAN Boot 36, 606
SAS cabling 556
shutdown 591
using the GUI 589
SNMP traps 24
software upgrades 544
STAT reports 434
Supported Hardware List 152
system configuration backup 13
terminology 3
thin-provisioned volumes 21
uploading the SSH public key 598
VMware ESX
iSCSI attachment 166
multipathing 166
Volume ID 435
volume types 191
websites 25
Windows
SAN Boot migration 607
IBM Subsystem Device Driver (SDD) 607
IBM Subsystem Device Driver DSM (SDDDSM)
155–156, 216, 229, 606
updates 608
IBM Support Center 24
IBM Tivoli Storage Productivity Center 13
identical data 503
IdlingDisconnected 509
image mode 14, 18, 417, 607
InconsistentCopying 509
InconsistentDisconnected 509
InconsistentStopped 509
Incremental FlashCopy
mappings 453
initialization process 331
inter-cluster 504, 522
communication 499
link bandwidth 517
internal storage 315, 317, 594
configuring 329
definition 4
intra-cluster 504
IP addresses 20, 25, 28–29, 34–35, 37–38, 50, 170, 221,
242–243, 602
IP network 19, 25
IP port numbers 242
iSCISI Configuration tab 221
iSCSI 19
access 34
addresses 20
attachment 166
Windows 2008 156
CHAP Secret 369
connections 12
ESX
attachment 240, 252
initiator 172

616
Implementing the IBM Storwize V3700
Ethernet ports 183
hosts 28
creating 176
initiator names 19, 157, 166, 172, 181, 242
interface 152
Microsoft software initiator 157
name 19
nodes 19
ports 221, 225
settings 184
volumes 213
mappings 242
Windows 2008 220, 228
iSCSI Alias 184
iSCSI Configuration tab 221, 224
iSCSI Host menu 181
iSCSI qualified names (IQN) 12, 20
iSCSI Service 157
iSCSI Software Adapter Properties window 172
ISL hop count 511
iSNS 184
J
JBOD 14
K
key generators 594–595, 597
key pairs 40, 594, 596
keys
HKEY_LOCAL_MACHINESYSTEMCurrentControlSe
tControl-
Class‘4D36E97B-E325-11CE-BFC1-08002BE10318}
<bus ID>Parameters axRequestHoldTime 161
HKEY_LOCAL_MACHINESYSTEMCurrentControlSe
tControl-
Class‘4D36E97B-E325-11CE-BFC1-08002BE10318}
<bus ID>ParametersLinkDownTime 161
HKEY_LOCAL_MACHINESystemCurrentControlSet
Services‡iskimeOutValue 154
private 594–595, 597, 601
public 594, 596, 598
SSH 594, 598
USB 41, 45
L
lanes
PHY 4
latency 412, 511, 517
LEDs 45, 321, 547, 554
logged 21
logical block addresses (LBA) 18
logical disks 17, 189
logs
messages 25
lower tiers 414
LUNs 153, 166
M
maintenance contract 25
management
copy services 515
FlashCopy 460
IP addresses 13, 35
system 38, 40–41, 50
Management Information Base (MIB) 24
mappings
FlashCopy 452
cleaning rate 454
host
definition 4
source volumes 457
volumes 152
master console 24
MDisks 338
additional actions 345
arrays 331, 347
capacity 317
definition 4
extended help 338
HDD tier 417
higher tier 413
internal storage
definition 4
lower tier 412
overview 14
Properties action 346
RAID 341
single-tiered storage pools 16
storage pools 191
swapping drives 343
unmanaged 341
definition 14
window 346
Member MDisk tab 395
memory dumps 544
metadata 21, 455
Metro Mirror 23, 417, 498, 503–504, 508–511, 521
consistency groups 508
relationships 508
microcode 544
Microsoft Multipath Input Output (MPIO) 154, 223
migration 20
automatic 16
Automatic Data Placement 417
Easy Tier 412, 417
extents 411–412, 417
FlashCopy 451
image mode volumes 18
images 607
plan 414
SAN Boot images 607
volumes 16
mirroring
advance mirroring settings 202
host based software 198
remote 28, 129
modes 14, 23, 166, 416

Index
617
monitoring 13, 413, 417, 544
Move to Consistency Group option 492
multipath I/O 155
multipath storage solution 154
multiple paths 36, 606
multitiered storage pools 16
N
Nearline SAS 11, 331
network management program 24
network time protocol (NTP) 37
nodes 544
adding back to a cluster 38
canisters 8, 30, 34, 45, 499, 511, 544
definitions 4
Ethernet ports 28
overview 546
expansion canisters
definition 4
FlashCopy mapping states 455
hung 544
internal storage
definition 4
Internet 20
IP addresses 28, 35
pairs 198
partner 12
port 1 28
ports 606
quorum disks 14
replacing 544
surviving 9
non-zero contingency 21
O
operations
copy 503, 510
data migration 590
I/O 455, 509, 512
IOPS 16
iSCSI 161
start and stop 456
stop 456
write 455, 504
ordering 456
overwritten 451
P
parity strips 14
partnerships
clusters 501
managing 515
creating 499, 511, 516
deleting 129
disconnected 519
new 129
states
Fully Configure (Remote Stopped) 502
Fully Configured (Remote Exceeded) 502
Fully Configured (Remote Excluded) 502
Fully Configured Stopped 519
Local Excluded 502
Partially Configured 501
Remote Not Present 502
Stopped 502, 519
stopped 519
passphrases 597
peak loads 512
performance
high performance disk tiers 426, 434–435
I/O 412
impacts 503
logs 412
needs 2
optimized setups 334
requirements 166
storage 412
testing 504
PHY 4
point in time (PiT) 3, 22, 454, 457, 504
copies 22, 457
data 456
pools
primary 200, 205
secondary 201, 206
Pools function icon
extended help 348
ports
FC Host Adapter 153, 164
iSCSI 225
iSCSi 221
node canister 511
power supply 8, 10
slots 8
power supply units (PSU) 558
removing 588
P-parity 14
presets 3, 327, 331, 333, 335, 460–461, 463, 467
private keys 594–595, 597, 601
public keys 594, 596, 598
PuTTY 594–597, 600, 602
key generators 597
Q
Q-parity 14
quorum
disks 4, 14
R
RAID
definition 13
MDisks 4
mirrored 13, 327
overview 13
performance 13
presets 3, 327, 331
types 16

618
Implementing the IBM Storwize V3700
RAID 0 13, 327
redundancy 13
RAID 1 13–14
RAID 10 14, 327
failure 14
RAID 5 14, 327, 434
redundancy 14
RAID 6 14, 327, 334
RAID arrays 3, 17, 38
goals 13, 557
spare 331
RAID levels 13, 315, 327, 331, 333, 420
redundancy 13
rebalancing 13, 557
receivers 25
Redbooks website 609
Contact us xiv
redundancy
access 3
arrays 13–14
boot devices 606
clustered system management 34
fabrics 30
hosts 36
inter-switch links 511
paths 608
PSUs 558
spare drives 326
relationship
consistent 512
Relationship function icon 536
relationships
background copies 454
cleaning rate 454
copy direction 528
FlashCopy 22, 452–453, 458
Global Mirror 512
image mode volumes 18
inter-cluster 522
Metro Mirror 503, 508
partnerships 519
Remote Copy 509
removing 523
stopping 525
reliability 152
reliability, availability, and serviceability (RAS) 544
remote
clusters 501–502
fabric 511
mirroring 28
nodes 511
service 24
storage system 517
Remote Copy
asynchronous 498, 504
configuration 498
consistency groups 508–509
creating 531
managing 531
copy services 449
description 498
general guidelines 510
Global Mirror 504
limits 511
link requirements 511
management 498
Metro Mirror 503
partnerships 518
planning 510
synchronous 498, 504
Remote Copy relationships 129, 502, 509–510, 523
deleting 530, 540
multiple 510
renaming 529
stand-alone 520–521
starting 527
stopping 525
switching direction 528
Remote Mirroring 129
response times 16
restore points 22, 458
Reverse FlashCopy 22, 458–459
roles
primary 502
S
SAN Boot 36, 164, 593, 606–607
hosts 153
SAN fabrics 9, 19, 36
SAN Volume Controller
clusters 594, 598
SCSI
commands 19
front ends 455
LUN IDs 607
SCSI IDs 215, 221, 229, 233, 241, 253, 369
secondary
read/write access 526
security
features 24
requirements 166
Serial Attached SCSI (SAS) 4, 10–11, 29–30, 331, 413,
547
connectivity 4
connectors 10
initiators 556
interfaces 10
ports 4, 10, 547
service tasks 13
Simple Network Management Protocol (SNMP) 24, 38,
544
manager 24
messages 24
settings 24
single points of failure 556
single-tiered 16, 413
sites
primary 504, 512
remote 505
secondary 504–505, 512

Index
619
target 503
SMTP server 25, 37
snapshots 4, 460, 464–465
solid-state drives (SSD) 11, 411
arrays 331, 434
capacity 435
Easy Tier 334, 420
Easy Tier presets 331
extents 417
hot data 417
MDisks 433, 558
multiered storage pools 422
performance 411
response times 411
tiers 414
sorting 502
sources 452, 458, 460, 505
Global and Metro Mirror 417
multiple 22
spare role 320
SSH 40, 594, 597–598, 600
client 594, 600–601
keys 594, 598
states
consistent 502, 508
link 547
model 509
processes 4
stopped 454, 494
stopping 453, 455
suspended 455
statistics 416
file 426
I/O 417, 431
log file 426
stop 526, 528
command 455
partnerships 519
process 494
storage
primary 37, 517
secondary 517
storage area networks (SAN)
configuration 30
failure 14
zoning 177, 187, 511, 606
storage pools
adding drives 13
capacity 4, 15, 344
clustered systems 16
configured
overview 428
definition 4, 15
Easy Tier 431
multitiered 422
overview 313
performance 413
single-tiered 428
striped volumes 17
target 413
thin provisioning
definition 4
strand 556
definition 4
striping 13–14
summary reports 414
superuser 38, 50
svctask 604
syslog
manager 25
messages 24–25
protocol 25
syslog messages sender 25
T
T0 22
targets 20, 226, 242, 417, 452, 458, 460, 472
IP address 242
names 19
TCP
ports 20
thin provisioned 192, 453
definition 4
thin provisioning 4, 20–21
thrashing 13
threshold warning 16
tie 14
time-zero copy 22
traffic 166, 168, 170, 226
troubleshooting 24, 38, 321
U
UDP 25
unbalanced 13, 557
unconfigured drives 335
unused 320, 330
updates 452, 456, 502, 505, 512
database transaction 456
drives and enclosures 556
HBA BIOS 153
write operations 504
upgrades
software 564
upper tier 414
USB 41, 45, 546
User Datagram Protocol 25
V
VDisks
auxiliary 504
virtualization 1–2, 17
volumes 3–4, 9, 12, 14, 17, 166, 189, 192, 196, 198, 201,
203, 206–207, 209, 212, 215–216, 218, 221, 229, 231,
233, 238, 241, 253, 258, 412, 425, 435, 450, 463, 472,
606
auxiliary 502, 504–505, 520, 522–523, 527, 539
boot 606
capacity

620
Implementing the IBM Storwize V3700
per I/O group 511
clones 464
copies 418–419, 431–432, 435
data placement 412
database 456
definition 4
details 429
discovering 210
entire 451
expanding 21
extents 413
fully allocated 21, 192
hot spots 12
I/O handling
management 12
image mode 18, 607
iSCSI 242
level 417
mappings 208, 604
overview 369
master 502, 504–505, 520, 522–523, 527, 539
maximum size 15–16
migrating 16, 20, 413
mirrored 16, 20–21, 203, 207, 417
automatic data placement 417
creating 199
peak write load 512
mirroring 16
non-mirrored 20
overview 17
pairs 510
primary 502, 504, 509, 527–528
properties 425, 604–605
Remote Copy
master 522
removing 362, 378, 384
secondary 502, 504, 509, 512, 528, 538–539
sequential 18, 417
size 522
snapshots 464
source 22, 451–455, 457–460, 467, 472, 474, 478,
481, 502–503, 510, 520, 523, 527
striped 17, 192
definition 17
target 22, 450–452, 455–457, 459–460, 465, 468,
474, 476–482, 502–503, 510, 512, 520, 522–523
multiple 22
thin-mirror 203
thin-provisioned 21–22, 195–197, 459–460, 472
UID 215, 221, 229, 233, 241, 253
W
warranty period 25
Windows 40, 42, 152–153, 155–157, 161, 213, 215–216,
218, 220–221, 227–229, 231, 433, 606–607
timeout value 153–154
wizard 330
WWPNs 12, 30
Z
zero contingency 21
zone 30, 152
zoning recommendation 511

(1.0” spine)
0.875”<->1.498”
460 <-> 788 pages
Implementing the IBM Storwize V3700
Implementing the IBM Storwize V3700 Implementing the IBM Storwize
V3700
Implementing the IBM Storwize V3700

Implementing the IBM Storwize
V3700
Implementing the IBM Storwize
V3700


®
SG24-8107-01 ISBN 0738438774
INTERNATIONAL
TECHNICAL
SUPPORT
ORGANIZATION
BUILDING TECHNICAL
INFORMATION BASED ON
PRACTICAL EXPERIENCE
IBM Redbooks are developed
by the IBM International
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from around the world create
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based on realistic scenarios.
Specific recommendations
are provided to help you
implement IT solutions more
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For more information:
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®
Implementing the IBM
Storwize V3700
Easily manage and
deploy systems with
embedded GUI
Experience rapid and
flexible provisioning
Protect data with
remote mirroring
Organizations of all sizes are faced with the challenge of managing
massive volumes of increasingly valuable data. But storing this data
can be costly, and extracting value from the data is becoming more
and more difficult. IT organizations have limited resources but must
stay responsive to dynamic environments and act quickly to
consolidate, simplify, and optimize their IT infrastructures. The IBM
Storwize V3700 system provides a smarter solution that is affordable,
easy to use, and self-optimizing, which enables organizations to
overcome these storage challenges.
Storwize V3700 delivers efficient, entry-level configurations that are
specifically designed to meet the needs of small and midsize
businesses. Designed to provide organizations with the ability to
consolidate and share data at an affordable price, Storwize V3700
offers advanced software capabilities that are usually found in more
expensive systems.
Built upon innovative IBM technology, Storwize V3700 addresses the
block storage requirements of small and midsize organizations.
Providing up to 240 TB of capacity packaged in a compact 2U,
Storwize V3700 is designed to accommodate the most common
storage network technologies to enable easy implementation and
management.
This IBM Redbooks publication is intended for pre- and post-sales
technical support professionals and storage administrators.
The concepts in this book also relate to the IBM Storwize V3500.
This book was written at a software level of Version 7 Release 1.
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