IBM DS6000 User Manual

Front cover

IBM System Storage DS6000
Series: Copy Services with
IBM System z

Plan, install and configure DS6000
Copy Services with System z

Learn how to use the management
interfaces: TSO, DS CLI, DS GUI

Learn about TPC for replication
support

Gustavo Castets

Bertrand Dufrasne

Stephen Baird

Werner Bauer

Denise Brown

Jana Jamsek

Wenzel Kalabza

Peter Klee

Markus Oscheka

Ying Thia

Robert Tondini

ibm.com/redbooks

International Technical Support Organization

IBM System Storage DS6000 Series: Copy Services
with IBM System z

December 2006

SG24-6782-02

Note: Before using this information and the product it supports, read the information in “Notices” on
page xv.

Third Edition (December 2006)

This edition applies to features, microcode, GUI and DS CLI as announced for the DS6000 in August 2006.

© Copyright International Business Machines Corporation 2005, 2006. All rights reserved.

Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM
Corp.

Contents

Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xv

Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

The team that wrote this redbook. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

Become a published author . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xx

Comments welcome. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xx

Summary of changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

December 2006, Third Edition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

Part 1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Chapter 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Introduction to Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1.1 Point-in-Time Copy (FlashCopy). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1.2 Remote Mirror and Copy RMC (formerly Peer-to-Peer Remote Copy). . . . . . . . . . 5

1.1.3 Optional Copy Services function for z/OS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter 2. Copy Services architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Introduction to the Copy Services structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.1 What is a management console? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.2 What is a Storage Unit? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.3 What is a Storage Facility Image (SFI)? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.4 What is a Storage Complex? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2 How the new structure of Copy Services works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.1 Remote Mirror and Copy between Storage Complexes . . . . . . . . . . . . . . . . . . . . 12

2.2.2 Differences between the DS CLI and the DS GUI . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3 System z communication path for Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Part 2. Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Chapter 3. DS Storage Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1 System and hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.1.1 Supported operating systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.2 Installation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.3 Connecting to your DS6000 SMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.3.1 Real-time and simulated configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.3.2 Advantages of using the DS GUI over the DS CLI or TSO . . . . . . . . . . . . . . . . . . 20

3.3.3 Disadvantages of using the DS GUI over the DS CLI or TSO . . . . . . . . . . . . . . . 20

3.4 Accessing the Information Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.5 Managing the Storage Complex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.5.1 Procedure to add a Storage Complex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Chapter 4. DS Command-Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.1 Introduction and functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.2 Supported operating systems for the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.3 User accounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.4 DS CLI profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

© Copyright IBM Corp. 2006. All rights reserved. iii

4.5 Command structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.6 Copy Services commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.7 Using the DS CLI application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.7.1 Single-shot mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.7.2 Script command mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.7.3 Interactive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.8 Return codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

4.9 User assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

4.10 Usage examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Chapter 5. System z interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

5.1 System z interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

5.1.1 Operating system alternatives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

5.2 TSO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

5.3 ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.4 DFSMSdss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.5 The ANTRQST macro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.6 z/TPF commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Part 3. FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Chapter 6. FlashCopy overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

6.1 Operational environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.2 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6.3 Basic concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6.3.1 Full volume copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.3.2 Nocopy option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.4 FlashCopy in combination with other Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . 49

6.4.1 FlashCopy and Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

6.4.2 FlashCopy and Global Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.4.3 FlashCopy and Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.5 FlashCopy for z/OS data sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Chapter 7. FlashCopy options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.1 Multiple relationship FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

7.2 Consistency Group FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

7.3 FlashCopy target as a Metro Mirror or Global Copy primary. . . . . . . . . . . . . . . . . . . . . 55

7.4 Incremental FlashCopy - refresh target volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

7.5 Remote FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

7.6 Persistent FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

7.7 Data set FlashCopy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

7.8 Reverse restore. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

7.9 Fast reverse restore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

7.10 Options and interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Chapter 8. FlashCopy ordering and activation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

8.1 Ordering FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

8.2 Activating FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

8.2.1 Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

8.2.2 Activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Chapter 9. FlashCopy interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

9.1 FlashCopy interfaces - overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

9.2 DS CLI and DS SM - commands and options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

iv IBM System Storage DS6000 Series: Copy Services with IBM System z

9.2.1 Local FlashCopy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

9.2.2 Remote FlashCopy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

9.3 z/OS-provided interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

9.4 Local FlashCopy using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

9.4.1 Parameters used with local FlashCopy commands . . . . . . . . . . . . . . . . . . . . . . . 73

9.4.2 Local FlashCopy commands - examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

9.4.3 FlashCopy Consistency Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

9.5 Remote FlashCopy using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

9.5.1 Remote FlashCopy commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

9.5.2 Parameters used in remote FlashCopy commands . . . . . . . . . . . . . . . . . . . . . . . 86

9.6 FlashCopy management using the DS SM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

9.6.1 Initiate FlashCopy using Create . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

9.6.2 Display properties of existing FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

9.6.3 Reverse existing FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

9.6.4 Initiate background copy for a persistent FlashCopy relationship. . . . . . . . . . . . . 93

9.6.5 Resynchronize target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

9.6.6 Delete existing FlashCopy relationship. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

9.7 z/OS interfaces for local FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

9.7.1 Initiating FlashCopy using DFSMSdss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

9.7.2 FlashCopy using TSO commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Chapter 10. FlashCopy performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

10.1 FlashCopy performance overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

10.1.1 Distribution of the workload - Source and target volumes location . . . . . . . . . . 112

10.1.2 LSS/LCU versus rank considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

10.1.3 Rank geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

10.1.4 Incremental FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

10.2 FlashCopy establish phase performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

10.3 Background copy performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

10.4 FlashCopy impact on applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

10.5 FlashCopy options - considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

10.6 FlashCopy scenarios. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

10.6.1 Scenario #1: Backup to disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

10.6.2 Scenario #2: Backup to tape. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

10.6.3 Scenario #3: FlashCopy during peak application activity . . . . . . . . . . . . . . . . . 117

10.6.4 Scenario #4: Ranks reserved for FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Chapter 11. FlashCopy examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

11.1 Create a test system or integration system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

11.1.1 One-time test system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

11.1.2 Multiple setup of a test system with same contents . . . . . . . . . . . . . . . . . . . . . 122

11.2 Create a backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

11.2.1 Create a FlashCopy for backup purposes without volume copy. . . . . . . . . . . . 123

11.2.2 Incremental FlashCopy for backup purposes . . . . . . . . . . . . . . . . . . . . . . . . . . 124

11.2.3 Using a target volume to restore its contents back to the source . . . . . . . . . . . 125

Part 4. Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Chapter 12. Metro Mirror overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

12.1 Metro Mirror overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

12.2 Metro Mirror volume state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

12.3 Data consistency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

12.4 Rolling disaster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

12.5 Automation and management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Contents v

Chapter 13. Metro Mirror options and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 133

13.1 High availability solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

13.1.1 GDPS HyperSwap Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

13.1.2 Open systems - Clustering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

13.2 Failover and failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

13.3 Consistency Group function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

13.3.1 Data consistency and dependent writes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

13.3.2 Consistency Group function - how it works . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

13.3.3 FREEZE and RUN parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

13.3.4 Critical attribute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

13.3.5 Consistency Group and critical mode combination . . . . . . . . . . . . . . . . . . . . . . 142

13.4 Metro Mirror paths and links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

13.4.1 Fibre Channel links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

13.4.2 Logical paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

13.5 Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

13.6 LSS design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

13.7 Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

13.8 Symmetrical configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

13.9 Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

13.10 Hardware requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Chapter 14. Metro Mirror interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

14.1 Metro Mirror interfaces - overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

14.2 TSO commands for Metro Mirror management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

14.2.1 Commands overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

14.2.2 CESTPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

14.2.3 CESTPATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

14.2.4 CDELPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

14.2.5 CDELPATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

14.2.6 CGROUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

14.2.7 CQUERY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

14.2.8 CRECOVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

14.2.9 CSUSPEND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

14.2.10 Batch execution of Metro Mirror TSO commands . . . . . . . . . . . . . . . . . . . . . . 157

14.3 ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

14.3.1 Metro Mirror management with ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

14.3.2 Display the Fibre Channel Connection Information Table. . . . . . . . . . . . . . . . . 159

14.3.3 PPRCOPY DELPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

14.3.4 PPRCOPY DELPATH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

14.3.5 PPRCOPY ESTPATH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

14.3.6 PPRCOPY ESTPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

14.3.7 PPRCOPY FREEZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

14.3.8 PPRCOPY QUERY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

14.3.9 PPRCOPY RECOVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

14.3.10 PPRCOPY SUSPEND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

14.3.11 PPRCOPY RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

14.3.12 Refreshing the VTOC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

14.4 DS Command-Line Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

14.4.1 DS CLI supported environments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

14.5 DS CLI command- examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

14.5.1 Set up a Metro Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

14.5.2 Remove a Metro Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

14.5.3 Manage a Metro Mirror environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

vi IBM System Storage DS6000 Series: Copy Services with IBM System z

14.6 DS Storage Manager GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

14.6.1 Define Metro Mirror paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

14.6.2 Create Metro Mirror pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

14.6.3 Resume suspended pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

14.7 ANTRQST API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Chapter 15. Metro Mirror performance and scalability . . . . . . . . . . . . . . . . . . . . . . . . 181

15.1 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

15.1.1 Peak bandwidth requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

15.1.2 RMF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

15.1.3 Initial synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

15.2 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Chapter 16. Metro Mirror examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

16.1 Resynchronization of suspended volume using TSO . . . . . . . . . . . . . . . . . . . . . . . . 186

16.2 Failover and failback using TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

16.2.1 Failover process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

16.2.2 Failback process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

16.3 Open systems volumes with TSO commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

16.4 Define Metro Mirror path using ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

16.5 DS CLI freezepprc and unfreezepprc commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

Part 5. Global Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199

Chapter 17. Global Copy overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

17.1 Global Copy overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

17.2 Volume states and change logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

17.3 Global Copy positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

Chapter 18. Global Copy options and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 205

18.1 Global Copy basic options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

18.1.1 Establish Global Copy pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

18.1.2 Suspend Global Copy pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

18.1.3 Resume Global Copy pair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

18.1.4 Terminate Global Copy pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

18.1.5 Convert a Global Copy pair to Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

18.2 Catch-up transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

18.2.1 Go-to-sync using TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

18.2.2 Go-to-sync using ICKDSF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

18.2.3 Go-to-sync using the DS Storage Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

18.2.4 Go-to-sync using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

18.2.5 Display out-of-sync tracks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

18.3 Create a consistent point-in-time copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

18.4 Cascading for ESS migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

18.5 Hardware requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

18.6 DS6800 I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

18.7 Global Copy connectivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

18.7.1 Fibre Channel links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

18.7.2 Logical paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

18.8 Distance considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

18.9 Other planning considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Chapter 19. Global Copy performance and scalability . . . . . . . . . . . . . . . . . . . . . . . . 219

19.1 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Contents vii

19.1.1 Peak bandwidth requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

19.2 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

19.2.1 Addition of capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Chapter 20. Global Copy interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

20.1 Global Copy interfaces - overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

20.2 TSO commands for Global Copy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

20.2.1 Commands summary and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

20.2.2 CESTPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224

20.2.3 CESTPATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

20.2.4 CDELPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

20.2.5 CDELPATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

20.2.6 CGROUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

20.2.7 CQUERY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

20.2.8 CRECOVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

20.2.9 CSUSPEND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

20.2.10 Batch execution of Global Copy TSO commands. . . . . . . . . . . . . . . . . . . . . . 228

20.3 ICKDSF utility for Global Copy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

20.4 DS Command-Line Interface (DS CLI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

20.4.1 Define Global Copy paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

20.4.2 Manage Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231

20.5 DS Storage Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

20.5.1 Paths panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

20.5.2 Metro Mirror panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

Chapter 21. Global Copy examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

21.1 Define and manage Global Copy pairs using TSO . . . . . . . . . . . . . . . . . . . . . . . . . . 238

21.2 Global Copy for migration using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

21.2.1 Migration procedure steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

21.2.2 Cascading alternative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244

Chapter 22. Global Mirror overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

22.1 Synchronous and non synchronous data replication . . . . . . . . . . . . . . . . . . . . . . . . 246

22.1.1 Synchronous data replication and dependent writes . . . . . . . . . . . . . . . . . . . . 246

22.1.2 Asynchronous data replication and dependent writes. . . . . . . . . . . . . . . . . . . . 250

22.2 Basic concepts of Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

22.3 Set up a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

22.3.1 Simple configuration to start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

22.3.2 Establish connectivity to remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

22.3.3 Create Global Copy relationship between local and remote volume . . . . . . . . 256

22.3.4 Introduce FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

22.3.5 Define Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

22.3.6 Populate Global Mirror session with volumes . . . . . . . . . . . . . . . . . . . . . . . . . . 259

22.3.7 Start Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259

22.4 Consistency Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

22.4.1 Consistency Group formation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

22.4.2 Consistency Group parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

Part 6. Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

Chapter 23. Global Mirror options and configuration . . . . . . . . . . . . . . . . . . . . . . . . . 267

23.1 Terminology used in Global Mirror environments . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

23.2 Create a Global Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

23.3 Modify a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

viii IBM System Storage DS6000 Series: Copy Services with IBM System z

23.3.1 Add or remove volumes to a Global Mirror session . . . . . . . . . . . . . . . . . . . . . 271

23.3.2 Add or remove storage disk subsystems or LSSs . . . . . . . . . . . . . . . . . . . . . . 272

23.3.3 Modify Global Mirror session parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

23.3.4 Global Mirror environment topology changes . . . . . . . . . . . . . . . . . . . . . . . . . . 273

23.3.5 Remove a FlashCopy relationship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

23.4 Remove a Global Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

23.5 Global Mirror with multiple storage disk subsystems . . . . . . . . . . . . . . . . . . . . . . . . 275

23.6 Connectivity between local and remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

23.6.1 Multi-site host connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

23.6.2 Single site host connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

23.7 Recovery scenario after primary site failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

23.7.1 Normal Global Mirror operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

23.7.2 Primary site failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

23.7.3 Failover B volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

23.7.4 Check for valid Consistency Group state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285

23.7.5 Set consistent data on B volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

23.7.6 Reestablish the FlashCopy relationship between B and C volumes. . . . . . . . . 290

23.7.7 Restart the application at the remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292

23.7.8 Prepare to switch back to the local site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292

23.7.9 Return to local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

23.7.10 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

Chapter 24. Global Mirror interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

24.1 Global Mirror interfaces - overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298

24.2 Different interfaces for the same function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298

24.2.1 Establish FlashCopy using TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

24.2.2 Establish FlashCopy using DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300

24.2.3 Establish FlashCopy using ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

24.2.4 Which interface to choose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

24.3 Global Mirror management using TSO commands . . . . . . . . . . . . . . . . . . . . . . . . . . 302

24.3.1 Establish a Global Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

24.3.2 Define paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

24.3.3 Establish Global Copy volume pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

24.3.4 Establish FlashCopy relationships for Global Mirror . . . . . . . . . . . . . . . . . . . . . 307

24.3.5 Define a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

24.3.6 Populate a Global Mirror session with volumes . . . . . . . . . . . . . . . . . . . . . . . . 309

24.3.7 Start a Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

24.3.8 Query a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

24.4 DS CLI to manage Global Mirror volumes in z/OS . . . . . . . . . . . . . . . . . . . . . . . . . . 313

24.5 Global Mirror management using ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

24.5.1 Establish a Global Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

24.5.2 Define paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 314

24.5.3 Establish Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316

24.5.4 Establish FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

24.5.5 Define a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318

24.5.6 Add volumes to a session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

24.5.7 Start Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

24.5.8 Query an active Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

24.5.9 Remove a Global Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324

24.5.10 Stop the Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 324

24.5.11 Remove volumes from Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325

24.5.12 Un-define the Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325

24.5.13 Withdraw FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326

Contents ix

24.5.14 Delete Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327

24.5.15 Remove all paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327

24.6 ANTRQST macro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327

24.7 DS Storage Manager GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

24.7.1 View Global Mirror volumes in session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

24.7.2 Pause and resume Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

Chapter 25. Global Mirror performance and scalability. . . . . . . . . . . . . . . . . . . . . . . . 335

25.1 Performance aspects for Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336

25.2 Performance considerations at coordination time . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

25.3 Consistency Group transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338

25.4 Remote storage disk subsystem configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338

25.5 Growth within Global Mirror configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340

Chapter 26. Global Mirror examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

26.1 Global Mirror examples - configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342

26.2 Global Mirror query examples with TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342

26.2.1 Query a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342

26.2.2 Query Global Mirror volume status - DVCSTAT option. . . . . . . . . . . . . . . . . . . 343

26.2.3 Query Global Mirror session summary - GMLSTAT option. . . . . . . . . . . . . . . . 343

26.2.4 Global Mirror session status for each LSS - GMPSTAT option . . . . . . . . . . . . 344

26.2.5 Timing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345

26.3 Set up the Global Mirror environment using TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . 345

26.3.1 Define paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

26.3.2 Establish Global Copy volume pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348

26.3.3 Establish FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

26.3.4 Define Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350

26.3.5 Populate the session with Global Copy primary volumes . . . . . . . . . . . . . . . . . 351

26.3.6 Start Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352

26.4 Primary site failure and recovery management with TSO . . . . . . . . . . . . . . . . . . . . . 352

26.4.1 Primary site failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353

26.4.2 Stop a Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

26.4.3 Failover from B to A volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355

26.4.4 Check Global Mirror FlashCopy status between B and C volumes . . . . . . . . . 355

26.4.5 Create a data consistent set of B volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

26.4.6 Optionally create a data consistent set of D volumes . . . . . . . . . . . . . . . . . . . . 356

26.4.7 Create a data consistent set of C volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357

26.4.8 Prepare to return to the local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

26.4.9 Replicate the changes from B to A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358

26.4.10 Return to the local site and resume Global Mirror. . . . . . . . . . . . . . . . . . . . . . 359

26.5 Remove Global Mirror environment using TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

26.5.1 Stop Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360

26.5.2 Remove volumes from the session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

26.5.3 Delete the Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362

26.5.4 Remove FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362

26.5.5 Delete Global Copy volume pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363

26.5.6 Remove the paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

26.6 Planned outage management using ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366

26.7 Remove a Global Mirror environment using ICKDSF . . . . . . . . . . . . . . . . . . . . . . . . 368

26.7.1 Stop Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368

26.7.2 Remove volumes from the session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368

26.7.3 Withdraw FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

26.7.4 Delete the Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370

x IBM System Storage DS6000 Series: Copy Services with IBM System z

26.7.5 Delete Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370

26.7.6 Remove Global Copy paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

26.8 Query device information with ICKDSF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

26.9 Set up a Global Mirror environment using DS SM . . . . . . . . . . . . . . . . . . . . . . . . . . 373

26.9.1 Create paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

26.9.2 Create Global Copy volume pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377

26.9.3 Establish FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

26.9.4 Create a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

26.10 Set up a Global Mirror environment using the DS CLI . . . . . . . . . . . . . . . . . . . . . . 389

26.10.1 DS CLI profile files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390

26.10.2 Create paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391

26.10.3 Create Global Copy volume pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392

26.10.4 Create FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

26.10.5 Create and start the Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . 394

26.11 Control and Query Global Mirror with the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . 395

26.11.1 Query status of the paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

26.11.2 Query Global Copy pairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

26.11.3 Query FlashCopy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

26.11.4 Query volumes in the session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

26.11.5 Query Global Mirror session information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397

26.11.6 Pause Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

26.11.7 Resume Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

26.11.8 Change a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400

26.12 Site switch basic operations using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

26.12.1 Perform a Global Copy failover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

26.12.2 Perform a Global Copy failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401

26.12.3 Create a FlashCopy for backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402

26.12.4 Verify FlashCopy status between B and C volumes . . . . . . . . . . . . . . . . . . . . 403

26.13 Remove the Global Mirror environment with the DS CLI . . . . . . . . . . . . . . . . . . . . 404

26.13.1 End Global Mirror processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405

26.13.2 Remove Global Mirror volumes and the session from each LSS . . . . . . . . . . 405

26.13.3 Remove FlashCopy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406

26.13.4 Remove Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406

26.13.5 Remove paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 406

Part 7. Interoperability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 409

Chapter 27. Combining Copy Service functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 411

27.1 Data migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412

Chapter 28. Interoperability between DS6000 and DS8000. . . . . . . . . . . . . . . . . . . . . 415

28.1 DS6000 and DS8000 Copy Services interoperability . . . . . . . . . . . . . . . . . . . . . . . . 416

28.2 Preparing the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416

28.2.1 Minimum microcode levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416

28.2.2 Hardware and licensing requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416

28.2.3 Network connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416

28.2.4 Creating matching user IDs and passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . 417

28.2.5 Updating the DS CLI profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417

28.2.6 Adding the Storage Complex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418

28.2.7 Volume size considerations for Remote Mirror Copy . . . . . . . . . . . . . . . . . . . . 421

28.2.8 Determining DS6000 and DS8000 CKD volume size . . . . . . . . . . . . . . . . . . . . 421

28.3 RMC: Establishing paths between DS6000 and DS8000 . . . . . . . . . . . . . . . . . . . . . 421

28.3.1 Decoding port IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

28.3.2 Path creation using the DS GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422

Contents xi

28.3.3 Establish logical paths between DS8000 and DS6000 using DS CLI. . . . . . . . 422

28.3.4 Path creation using TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424

28.4 Managing Metro Mirror or Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425

28.4.1 Managing Metro Mirror or Global Copy pairs with the DS GUI . . . . . . . . . . . . . 425

28.4.2 Managing Metro Mirror pairs using the DS CLI. . . . . . . . . . . . . . . . . . . . . . . . . 425

28.4.3 Managing Global Copy pairs usingthe DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . 426

28.5 Managing DS6000 to DS8000 Global Mirror. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426

28.5.1 Managing Global Mirror pairs using DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . 426

28.6 Managing DS6000 and DS8000 FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 427

28.6.1 Creating a remote FlashCopy on an DS6000 using DS CLI. . . . . . . . . . . . . . . 427

28.7 z/OS Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428

Part 8. Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431

Chapter 29. Interoperability between DS6000 and ESS 800 . . . . . . . . . . . . . . . . . . . . 433

29.1 DS6000 and ESS 800 Copy Services interoperability . . . . . . . . . . . . . . . . . . . . . . . 434

29.2 Preparing the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434

29.2.1 Minimum microcode levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434

29.2.2 Hardware and licensing requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434

29.2.3 Network connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434

29.2.4 Creating matching user IDs and passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . 435

29.2.5 Updating the DS CLI profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435

29.2.6 Adding the Copy Services domain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436

29.2.7 Volume size considerations for RMC (PPRC). . . . . . . . . . . . . . . . . . . . . . . . . . 437

29.2.8 Volume address considerations on the ESS 800 . . . . . . . . . . . . . . . . . . . . . . . 439

29.3 RMC: Establishing paths between DS6000 and ESS 800 . . . . . . . . . . . . . . . . . . . . 439

29.3.1 Decoding port IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439

29.3.2 Creating paths with the DS GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440

29.3.3 Establishing logical paths between DS6000 and ESS 800 using DS CLI. . . . . 443

29.3.4 Creating paths using TSO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446

29.4 Managing Metro Mirror or Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446

29.4.1 Managing Metro Mirror or Global Copy pairs using the DS GUI . . . . . . . . . . . . 446

29.4.2 Managing Metro Mirror pairs with the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . 450

29.4.3 Creating Metro Mirror pairs with TSO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451

29.4.4 Managing Global Copy pairs with the DS CLI. . . . . . . . . . . . . . . . . . . . . . . . . . 451

29.5 Managing ESS 800 Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451

29.5.1 Managing Global Mirror pairs using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . 451

29.6 Managing ESS 800 FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 452

29.6.1 Creating an ESS 800 FlashCopy with the DS GUI . . . . . . . . . . . . . . . . . . . . . . 453

29.6.2 Creating an ESS 800 FlashCopy with the DS CLI . . . . . . . . . . . . . . . . . . . . . . 454

29.6.3 Creating a remote FlashCopy on an ESS 800 with the DS CLI . . . . . . . . . . . . 454

Chapter 30. IIBM TotalStorage Rapid Data Recovery . . . . . . . . . . . . . . . . . . . . . . . . . 457

30.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458

30.1.1 Solution highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458

30.2 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458

30.3 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462

30.4 Additional information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

Chapter 31. IBM TotalStorage Productivity Center for Replication . . . . . . . . . . . . . . 467

31.1 IBM TotalStorage Productivity Center. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468

31.2 Where we are coming from . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469

31.3 What TPC for Replication provides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469

31.4 Copy Services terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470

xii IBM System Storage DS6000 Series: Copy Services with IBM System z

31.4.1 FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 470

31.4.2 Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471

31.4.3 Global Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471

31.4.4 Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471

31.4.5 Failover/Failback terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471

31.5 TPC for Replication terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473

31.5.1 TPC for Replication Copy Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 473

31.5.2 TPC for Replication session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474

31.6 TPC for Replication session types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476

31.6.1 TPC for Replication Basic Edition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476

31.6.2 TPC for Replication Advanced Edition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476

31.7 TPC for Replication session states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477

31.8 Volumes in a copy set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477

31.8.1 Host volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478

31.8.2 Target volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478

31.8.3 Journal volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478

31.9 TPC for Replication and scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479

31.10 TPC for Replication system and connectivity overview. . . . . . . . . . . . . . . . . . . . . . 479

31.11 TPC for Replication monitoring and freeze capability . . . . . . . . . . . . . . . . . . . . . . . 483

31.12 TPC for Replication heartbeat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484

31.13 Supported platforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 485

31.14 Hardware requirements for TPC for Replication servers. . . . . . . . . . . . . . . . . . . . . 486

31.15 TPC for Replication GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487

31.15.1 Connect to the TPC for Replication GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488

31.15.2 Health Overview panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 489

31.15.3 Sessions panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491

31.15.4 Storage Subsystems panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 492

31.15.5 Path Management panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494

31.15.6 RM Server Configuration panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495

31.15.7 Advanced Tools panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 496

31.15.8 Console log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 497

31.16 Command Line Interface to TPC for Replication. . . . . . . . . . . . . . . . . . . . . . . . . . . 498

Chapter 32. GDPS overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501

32.1 GDPS solution offerings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502

32.1.1 GDPS/PPRC overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503

32.1.2 PPRC and HyperSwap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504

32.1.3 RCMF/PPRC overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504

32.1.4 GDPS/XRC overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505

32.1.5 RCMF/XRC overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505

32.1.6 GDPS/GM (Global Mirror) overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506

32.1.7 GDPS 3-site solution overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506

32.1.8 IBM Global Services offerings for GDPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507

Appendix A. Concurrent Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509

Concurrent Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510

Concurrent Copy terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510

Benefits of using Concurrent Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 511

Concurrent Copy operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512

Invoking Concurrent Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512

Concurrent Copy on the DS6000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512

Sizing and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513

Contents xiii

Production and performance considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513

SMF information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515

Examples of Concurrent Copy invocation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515

Appendix B. SNMP notifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 519

SNMP overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520

Physical connection events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 520

Remote copy events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 522

Global Mirror related events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 522

Appendix C. Licensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525

Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 526

Authorized level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 527

Charging example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 527

Appendix D. CLI migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 529

Migrating ESS CLI to DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530

Reviewing the ESS tasks to migrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530

Convert the individual tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 531

Related publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537

IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537

Other publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537

Online resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 538

How to get IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539

Help from IBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 541

xiv IBM System Storage DS6000 Series: Copy Services with IBM System z

Notices

This information was developed for products and services offered in the U.S.A.

IBM may not offer the products, services, or features discussed in this document in other countries. Consult
your local IBM representative for information on the products and services currently available in your area.
Any reference to an IBM product, program, or service is not intended to state or imply that only that IBM
product, program, or service may be used. Any functionally equivalent product, program, or service that does
not infringe any IBM intellectual property right may be used instead. However, it is the user's responsibility to
evaluate and verify the operation of any non-IBM product, program, or service.

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This information contains examples of data and reports used in daily business operations. To illustrate them
as completely as possible, the examples include the names of individuals, companies, brands, and products.
All of these names are fictitious and any similarity to the names and addresses used by an actual business
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COPYRIGHT LICENSE:

This information contains sample application programs in source language, which illustrate programming
techniques on various operating platforms. You may copy, modify, and distribute these sample programs in
any form without payment to IBM, for the purposes of developing, using, marketing or distributing application
programs conforming to the application programming interface for the operating platform for which the sample
programs are written. These examples have not been thoroughly tested under all conditions. IBM, therefore,
cannot guarantee or imply reliability, serviceability, or function of these programs.

© Copyright IBM Corp. 2006. All rights reserved. xv

Trademarks

The following terms are trademarks of the International Business Machines Corporation in the United States,
other countries, or both:

AIX 5L™
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CICS®
DB2®
DFSMSdfp™
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DFSMShsm™
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ESCON®
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Other company, product, or service names may be trademarks or service marks of others.

xvi IBM System Storage DS6000 Series: Copy Services with IBM System z

Preface

This IBM Redbook will help you plan, install, and configure the IBM System Storage DS6000
Copy Services functions in System z™ environments, and provides the details you need to
implement and manage these functions. The book includes hints and tips.

This document is intended to help you either to design and set up a new Copy Services
installation, or to migrate from an existing installation. It also addresses functionality and
terminology differences from other IBM Copy Services products.

You can read this book in conjunction with the IBM Redbook IBM System Storage DS6000
Series: Architecture and Implementation, SG24-6781. You may also wish to refer to the
companion IBM Redbook for the DS6000 that supports the configuration of the Copy
Services functions in open systems environments, IBM System Storage DS6000 Series:
Copy Services in Open Environments, SG24-6783.

The team that wrote this redbook

This redbook was produced in Mainz, Germany, by a team of specialists from around the
world working for the International Technical Support Organization, San Jose Center.

Gustavo Castets is a Certified IBM IT Specialist and Project Leader working for the IBM
International Technical Support Organization, San Jose Center. While in San Jose, from
2001 to 2004, he co-authored twelve IBM Redbooks and taught IBM classes worldwide in the
area of disk storage systems. Before joining the ITSO, Gustavo was based in Buenos Aires,
where he worked in different technical sales support positions for more than 22 years. Today,
in addition to his work with the ITSO, he works for IBM Global Delivery in Argentina as a
Storage Specialist supporting US and European accounts.

Bert Dufrasne is a Certified Consulting IT Specialist and Project Leader for IBM TotalStorage
and System Storage products at the International Technical Support Organization, San Jose
Center. He has worked at IBM in various IT areas. Before joining the ITSO, he worked for IBM
Global Services as an Application Architect. Bert holds a degree in Electrical Engineering.

Stephen Baird is an IT Specialist with IBM Global Services. He joined IBM in 1999, working
in Open Systems Server Performance Management and Capacity Planning. Since 2002, he
has worked in Storage Area Network and Disk Storage subsystem support, and has gained
experience with Brocade, Cisco, and McData fiber channel switches and directors as well as
DS8000, DS4000™, and ESS series hardware. Stephen holds a degree in Mechanical
Engineering from the Massachusetts Institute of Technology, in Cambridge, MA.

Werner Bauer is a Certified Consulting IT Specialist in Germany. He has 26 years of
experience in Storage software and hardware, as well as with S/390® and z/OS. His areas of
expertise include Disaster Recovery solutions for enterprises utilizing the unique capabilities
and features of the IBM Disk Storage Servers, ESS and DS6000/DS8000. Werner
co-authored IBM Redbooks about Transactional VSAM, DS6000™/DS8000 Concepts and
Architecture, and DS6000/DS8000 Copy Services. He holds a degree in Economics from the
University of Heidelberg and a degree in Mechanical Engineering from FH Heilbronn.

Denise Brown is a Software Engineer at the IBM Open Systems Level Test Lab in Tucson,
Arizona. She has been working with IBM Storage for the past four years, with experience in
Storage software and hardware in an Open System environment. Her current areas of focus

© Copyright IBM Corp. 2006. All rights reserved. xvii

include Copy Services solutions in Metro/Global Mirror and Incremental Re-synchronization
for the DS8000. Denise holds a degree in Engineering Mathematics.

Jana Jamsek is an IT Specialist with IBM Slovenia. She works in Storage Advanced
Technical Support for Europe as a specialist for IBM Storage Systems and i5/OS® systems.
Jana has eight years of experience in the System i™ and AS/400® areas, and six years of
experience in Storage. She holds a Master’s degree in Computer Science and a degree in
Mathematics from the University of Ljubljana, Slovenia. Jana co-authored the Redpapers The

LTO Ultrium Primer for IBM eServer™ iSeries™ Customers and Multipath for IBM eServer
iSeries, and IBM Redbooks iSeries in Storage Area Networks and iSeries and IBM
TotalStorage: A Guide to Implementing External Disk on IBM eServer iseries.

Wenzel Kalabza is an IT Specialist in IBM Germany. He started in 1998 as a Field Quality
Engineer for IBM hard disk drives and was the Technical Lead in HDD robustness and
rotational vibration testing. He has three years of experience supporting IBM Storage
products. As a member of the DASD EMEA back office, Wenzel initially supported the ESS,
and is now a Product Field Engineer for the DS6000, specializing in Copy Services.

Peter Klee is an IT Specialist who joined IBM in 2003, working for Strategic Outsourcing.
Since June 2004, he has been part of the ATS System Storage team in Mainz, Germany.
With 10 years of experience in data centers, he previously worked for a large bank in Ger­many and was responsible for the architecture and implementation of the disk storage envi­ronment using EMC Symmetrix, HDS Lightning, and ESS Model 800. Today, Peter’s main
focus is on Copy Services in the Open Systems environment with DS8000 and DS6000,
especially Global Mirror and Metro/Global Mirror.

Markus Oscheka is an IT Specialist for Proof of Concept and Benchmarks at the ATS
Customer Solutions team in Mainz, Germany. His areas of expertise include setup and
demonstration of IBM System Storage products and solutions in various environments
including AIX®, Linux®, Windows®, HP-UX and Solaris™. Markus has worked at IBM for five
years, and has performed many Proofs of Concept with Copy Services on DS6000/DS8000,
as well as Performance Benchmarks with DS4000/DS6000/DS8000.

Ying Thia is an Advisory IT Specialist based in IBM Singapore, providing Storage technical
support. She has 14 years of experience in the S/390 and Storage environment. Prior to
joining the IBM Singapore Storage team, Ying worked in IBM Global Services where her
responsibilities included technical support and services delivery. Her areas of expertise
include IBM high-end Disk and Tape Storage subsystems and Disaster Recovery solutions
using the capabilities and features of IBM Storage products. She co-authored a previous IBM
Redbook and contributed to a workshop for System z copy services.

Robert Tondini is a Senior IT Specialist based in IBM Australia, providing Storage technical
support. He has 12 years of experience in the S/390 and Storage environment. His areas of
expertise include IBM high-end Disk and Tape Storage subsystems and Disaster Recovery
solutions using the capabilities and features of IBM storage products. Robert has co-authored
several IBM Redbooks and contributed to a workshop for System z copy services.

xviii IBM System Storage DS6000 Series: Copy Services with IBM System z

The team: Gustavo, Robert, Wenzel, Jana, Peter, Markus, Denise, Werner, Ying, Stephen, Bertrand

Acknowledgements

John Bynum and Robert Moon - Technical Support Marketing Leads
IBM US

We want to thank Michael Eggloff and Peter Klee for hosting us at the European Storage
Competency Center in Mainz, Germany.

Günter Schmitt, Uwe Schweikhard, Edgar Strubel (ATS - IBM Mainz) for their help in
reserving and preparing the equipment we used.

Monika Baier, Susanne Balzer, Marion Barlen, Marion Hartmann, Andrea Witkowski, Gertrud
Kramer - IBM Mainz, for their help with administrative tasks.

Many thanks to the authors of the previous edition of this redbook:
Peter Kimmel, Jukka Myyrlainen, Lu Nguyen, Gero Schmidt, Shin Takata, Anthony

Vandewerdt, Bjoern Wesselbaum

We also would like to thank:

Selwyn Dickey, Timothy Klubertanz, Vess Natchev, James McCord and Chuck Stupca
IBM Rochester - System i Client Technology Center

Guido Ihlein, Marcus Dupuis, Wilfried Kleemann
IBM Germany

Bob Bartfai, Jennifer Mason, James Davison, Steve Van Gundy, Richard Ripberger, Bill
Raywinkle, Christopher o’Toole, Jim Sedgwick, Henry Sautter, Craig Gordon, Rosemary
McCutchen,, Lee La Frese, Alan McClure, Rachel Mikolajewski, Gail Spear, Leann Vaterlaus,
David V Valverde, Sonny Williams, Bob Moon.

Brian Sherman
IBM Canada

Nick Clayton
IBM UK

Preface xix

Emma Jacobs and Alfred Schwab
ITSO editorial assistance

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xx IBM System Storage DS6000 Series: Copy Services with IBM System z

Summary of changes

This section describes the technical changes made in this edition of the book and in previous
editions. This edition may also include minor corrections and editorial changes that are not
identified.

Summary of Changes
for SG24-6782-02
for IBM System Storage DS6000 Series: Copy Services with IBM System z
as created or updated on December 14, 2006.

December 2006, Third Edition

This revision reflects the addition, deletion, or modification of new and changed information
described below.

New information

򐂰 IBM TotalStorage Productivity Center for Replication
򐂰 Data migration through double cascading
򐂰 DS6000 model 1750-522

Changed information

򐂰 Updated Copy Services examples
򐂰 Updated Licensing information

© Copyright IBM Corp. 2006. All rights reserved. xxi

xxii IBM System Storage DS6000 Series: Copy Services with IBM System z

Part 1 Overview

In Part 1 we describe the various Advanced Copy Services offerings for the IBM System
Storage DS6000 series and how they relate to previous Copy Services offerings that are
available on the Enterprise Storage Server® (ESS).

Part 1

This part also shows how the existing Copy Services functions from the ESS can coexist with
the Copy Services for the DS6000 series. Similarly, we discuss their use with the DS8000
series Copy Services.

With the announcement of the DS6000 Series and of Advanced Copy Services for z/OS on
the DS6000 Series, we have introduced some new terminology. We also introduced these
terms for Advanced Copy Services Version 2 for the ESS. These terms are described in detail
in IBM System Storage DS6000 Series: Architecture and Implementation, SG24-6781, and
are summarized in Table 1.

Table 1 Reference chart for DS Copy Services on DS6000.

DS6000 Function ESS800 Version 2 Function Formerly known as

FlashCopy® FlashCopy FlashCopy

Global Mirror Global Mirror Asynchronous PPRC

Metro Mirror Metro Mirror Synchronous PPRC

Global Copy Global Copy PPRC Extended Distance

z/OS Global Mirror z/OS Global Mirror Extended Remote Copy (XRC)

Metro/Global Mirror for System
z, 3-site solution as an XRC
target only

Metro/Global Copy Metro/Global Copy 2- or 3-site Asynchronous

z/OS Metro/Global Mirror 3-site solution using Sync

PPRC and XRC

Cascading PPRC

© Copyright IBM Corp. 2006. All rights reserved. 1

You can use either the IBM System Storage DS Storage Command-Line Interface, DS CLI,
or the IBM System Storage DS Storage Manager Copy Services Graphical User Interface,
DS GUI, to configure Copy Services.

It should be noted that:
򐂰 All DS6000 installations require at least an Operating Equipment License (OEL) key to

operate. However, Copy Services functions can only be used where the appropriate
License Key is installed.

򐂰 The key Copy Services license types are: OEL, Remote Mirror and Copy (RMC) or PPRC,

and Point-in-Time Copy (PTC) or FlashCopy.

򐂰 The DS CLI replaces both the ESS CLI and the ESS Copy Services CLI.
򐂰 The DS CLI can also be used for ESS 800 Copy Services, but not ESS configuration. For

ESS configuration you must continue to use the ESS Web Specialist or ESS CLI.

򐂰 The DS CLI can invoke Remote Mirror relationships with ESS 800, if the ESS 800 is at

code level LIC 2.4.3.65 or above.

򐂰 The DS CLI can be used in reusable scripts and provides a consistent interface for current

and planned System Storage products.

򐂰 The DS CLI now invokes a Copy Services function directly rather than invoking a saved

task.

򐂰 The DS GUI can only be used for one-time execution of a Copy Services operation; it

cannot save tasks.

2 IBM System Storage DS6000 Series: Copy Services with IBM System z

Chapter 1. Introduction

This chapter introduces the business drivers for Copy Services and provides a brief summary
of the various Copy Services functions available on the DS6000 series. These services are
very similar to the existing Copy Services for the IBM Enterprise Storage Server, and some
models of the ESS are interoperable with the DS8000 as well as the DS6000

1

© Copyright IBM Corp. 2006. All rights reserved. 3

1.1 Introduction to Copy Services

We briefly describe each function of the Copy Services in this section. Copy Services are a
collection of functions that provide for Disaster Recovery, data migration, and data duplication
functions. There are two primary types of Copy Services functions:

Remote Mirror and Copy. Generally, the Point-in-Time Copy function is used for data

duplication and the Remote Mirror and Copy function is used for data migration and Disaster
Recovery.

With the Copy Services functions, you can create backup data with little or no disruption to
your application, and you can back up your application data to the remote site for uses such
as Disaster Recovery.

Copy Services run on the DS6000 Storage Unit and support open systems and System z
environments. These functions are also supported on the DS8000 series and the previous
generation of storage systems, the IBM TotalStorage Enterprise Storage Server (ESS).

Many design characteristics of the DS6000 and data copying and mirroring capabilities of the
Copy Services features contribute to the protection of data, 24 hours a day and seven days a
week. The licensed features included in Copy Services are the following:

򐂰 FlashCopy, which is a Point-in-Time Copy function
򐂰 Remote Mirror and Copy functions, previously known as Peer-to-Peer Remote Copy or

PPRC, which include:

– IBM System Storage Metro Mirror, previously known as synchronous PPRC

Point-in-Time Copy and

– IBM System Storage Global Copy, previously known as PPRC Extended Distance
– IBM System Storage Global Mirror, previously known as Asynchronous PPRC

򐂰 z/OS Global Mirror, previously known as Extended Remote Copy (XRC)
򐂰 z/OS Global Mirror and Metro Mirror across three sites. In this environment the DS6000

can only operate as a secondary system.

We explain these functions in more detail in the next section.

You can manage the Copy Services functions through a command-line interface (DS CLI)
and a new Web-based interface (DS Storage Manager). You can also manage the Copy
Services functions through the open application programming interface (DS Open API).
When you manage the Copy Services through these interfaces, these interfaces invoke Copy
Services functions via the Ethernet network. In System z environments, you can invoke the
Copy Service functions by TSO commands, ICKDSF, the DFSMSdss™ utility, and so on.

We explain these interfaces in Part 2, “Interfaces” on page 15.

1.1.1 Point-in-Time Copy (FlashCopy)

The Point-in-Time Copy feature, which includes FlashCopy, enables you to create full volume
copies of data in a Storage Unit. To use it, you must purchase the Point-in-Time Copy
License feature code #5200 PTC for the required DS6800 storage server machine type 1750.

When you set up a FlashCopy operation, a relationship is established between the source
and target volumes, and a bitmap of the source volume is created. Once this relationship and
bitmap are created, the target volume can be accessed as though all the data had been
physically copied. While a relationship between the source and target volume exists,
optionally, a background process copies the tracks from the source to the target volume.

4 IBM System Storage DS6000 Series: Copy Services with IBM System z

When a FlashCopy operation is invoked, it takes only a few seconds to complete the process
of establishing the FlashCopy pair and creating the necessary control bitmaps. Thereafter,
you have access to a Point-in-Time Copy of the source volume. As soon as the pair has been
established, you can read and write to both the source and target volumes.

After creating the bitmap, a background process begins to copy the real data from the source
to the target volumes. If you access the source or the target volumes during the background
copy, FlashCopy manages these I/O requests, and facilitates both reading from and writing to
both the source and target copies. When all the data has been copied to the target, the
FlashCopy relationship is ended.

1.1.2 Remote Mirror and Copy RMC (formerly Peer-to-Peer Remote Copy)

The Remote Mirror and Copy (RMC) license authorization enables several Copy Services
functions depending on the configuration and settings you use. RMC is a flexible data
mirroring technology that allows replication between volumes on two or more disk storage
systems. You can also use this feature for data backup and Disaster Recovery.

Remote Mirror and Copy is an optional function. To use it, you must purchase the Remote
Mirror and Copy function authorization code #5300 RMC for the required DS6800 storage
server machine type 1750.

DS6000 Storage Units can participate in Remote Mirror and Copy solutions with another
DS6000, or with the ESS Model 750, ESS Model 800, and DS8000 Storage Units. To
establish an RMC (formerly PPRC) relationship between the DS6000 and the ESS, the ESS
needs to have licensed internal code (LIC) Version 2.4.3.65 or later.

The Remote Mirror and Copy feature can operate in the following modes:

Metro Mirror (formerly Synchronous PPRC)

Metro Mirror provides real-time mirroring of logical volumes between two DS6000s that you
can place up to 300 km from each other. It is a synchronous copy solution where write
operations are completed on both copies (local and remote site) before they are considered
to be complete.

Global Copy (formerly PPRC-XD)

Global Copy copies data non-synchronously and over longer distances than is possible with
Metro Mirror. When operating in Global Copy mode, the source volume sends a periodic,
incremental copy of updated tracks to the target volume, instead of sending a constant
stream of updates. This causes less impact to application writes for source volumes and less
demand for bandwidth resources, while allowing a more flexible use of available bandwidth.

Global Copy does not keep the sequence of write operations. Therefore, the copy is normally
fuzzy, but you can make a consistent copy through synchronization (called a go-to-sync
operation). After the synchronization, you can issue FlashCopy at the secondary site to make
the backup copy with data consistency. After the establishment of the FlashCopy, you can
change the mode back to non-synchronous mode.

Note: When you change from synchronous to non-synchronous mode, you must suspend
first, and then change mode to non-synchronous mode.

If you want to make a consistent copy with FlashCopy, you must purchase a Point-in-Time
Copy function authorization license for the secondary Storage Unit.

Chapter 1. Introduction 5

Global Mirror (Asynchronous PPRC)

Global Mirror provides a long-distance remote copy feature across two sites using
asynchronous technology. This solution is based on the existing Global Copy and FlashCopy.
With Global Mirror, the data that the host writes to the Storage Unit at the local site is
asynchronously shadowed to the Storage Unit at the remote site. A consistent copy of the
data is automatically maintained on the Storage Unit at the remote site.

Global Mirror operations provide the benefit of supporting operations over virtually unlimited
distances between the local and remote sites, restricted only by the capabilities of the
network and the channel extension technology. It can also provide a consistent and
restartable copy of the data at the remote site, created with minimal impact to applications at
the local site.

The ability to maintain an efficient synchronization of the local and remote sites with support
for failover and failback modes helps to reduce the time that is required to switch back to the
local site after a planned or unplanned outage.

1.1.3 Optional Copy Services function for z/OS

The following functions are only available for z/OS environments with restrictions for where
they can be employed.

z/OS Global Mirror RMZ (formerly XRC)

DS6000 storage servers support z/OS Global Mirror only as a secondary storage server. You
cannot use a DS6000 as a primary storage server for z/OS Global Mirror.

The z/OS Global Mirror function mirrors data on the Storage Unit to a remote location for
Disaster Recovery. It protects data consistency across all volumes that you have defined for
mirroring. The volumes can reside on several different Storage Units. The z/OS Global Mirror
function can mirror the volumes over several thousand kilometers from the source site to the
target recovery site. With z/OS Global Mirror, you can suspend or resume service during an
outage. You do not have to terminate your current data-copy session. You can suspend the
session, then restart it. Only data that changed during the outage must be re-synchronized
between the copies.

z/OS Global Mirror and Metro Mirror across 3 sites

This mirroring capability uses z/OS Global Mirror to mirror primary site data to a location that
is a long distance away and also uses Metro Mirror to mirror primary site data to a location
within the metropolitan area. This enables a z/OS 3-site high availability and disaster
recovery solution for even greater protection from unplanned outages. To use it, you must
purchase both of the following functions:

򐂰 Remote Mirror for z/OS (2244 Model RMZ for DS8000 Series) on primary site
򐂰 Remote Mirror and Copy function (2244 Model RMC for DS8000 Series or Machine Type

1750 feature code #5300 RMC for the DS6000 Series) for the primary Storage Unit and
secondary Storage Units at the alternate metropolitan site

Restriction: The XRC and 3-site z/OS Global Mirror environments are supported on
DS6000 Series only as secondary servers at remote sites. They only require standard
DS6000 Copy Services licenses for RMC for the appropriate storage level in a CKD
environment.

6 IBM System Storage DS6000 Series: Copy Services with IBM System z