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© Copyright IBM Corp. 2006. All rights reserved. 43
Chapter 6. FlashCopy overview
FlashCopy creates a copy of a volume at a specific point-in-time, which we also refer to as a
Point-in-Time copy, instantaneous copy, or time-zero copy (t0 copy).
This chapter explains the basic characteristics of FlashCopy when used in a System z
environment with the DS6000. The following topics are discussed:
FlashCopy operational areas.
FlashCopy basic concepts.
FlashCopy in combination with other Copy Services.
Data set level FlashCopy.
6
- IBM System Storage DS6000 1
- Series: Copy Services with 1
- IBM System z 1
- December 2006 3
- Third Edition (December 2006) 4
- Contents 5
- Contents v 7
- Contents vii 9
- Contents ix 11
- Contents xi 13
- Contents xiii 15
- Trademarks 18
- Acknowledgements 21
- Become a published author 22
- Comments welcome 22
- Summary of changes 23
- Overview 25
- Introduction 27
- Point-in-Time Copy and 28
- Chapter 1. Introduction 5 29
- Copy Services architecture 31
- DS6000 SFI 32
- DS8000 SFI 33
- Storage 34
- Complex 1 34
- Complex 2 34
- DS8000 management structure 35
- Client 1 36
- Client 2 36
- Interfaces 39
- 3.2 Installation modes 42
- http://10.0.0.1, you will 43
- 10.0.0.1 46
- Management 47
- 10.0.0.100 48
- DS Command-Line Interface 49
- 4.3 User accounts 51
- 4.4 DS CLI profile 52
- 4.5 Command structure 53
- 4.6 Copy Services commands 53
- Table 4-3 Creation commands 54
- Table 4-4 Deletion commands 54
- Table 4-5 Options commands 54
- 4.7.1 Single-shot mode 55
- 4.7.2 Script command mode 56
- 4.7.3 Interactive mode 56
- 4.8 Return codes 57
- 4.9 User assistance 58
- 4.10 Usage examples 59
- System z interfaces 61
- 5.1 System z interfaces 62
- 5.2 TSO 62
- 5.3 ICKDSF 63
- 5.4 DFSMSdss 63
- 5.5 The ANTRQST macro 63
- 5.6 z/TPF commands 63
- FlashCopy overview 67
- 6.1 Operational environments 68
- 6.2 Terminology 69
- 6.3 Basic concepts 69
- Writing to the source and 70
- Writing to the target 71
- 6.3.1 Full volume copy 72
- 6.3.2 Nocopy option 72
- FlashCopy options 77
- 7.5 Remote FlashCopy 83
- 7.6 Persistent FlashCopy 83
- 7.7 Data set FlashCopy 83
- 7.8 Reverse restore 84
- 7.9 Fast reverse restore 84
- 7.10 Options and interfaces 84
- Function 85
- FlashCopy ordering and 87
- 8.1 Ordering FlashCopy 88
- 8.2 Activating FlashCopy 89
- License value 90
- Deactivation 90
- 8.2.2 Activation 91
- FlashCopy interfaces 93
- 9.3 z/OS-provided interfaces 96
- ========= 101
- 0000:0100 101
- 0001:0101 101
- can be incremented. To 104
- . Identify the 113
- Reverse 116
- . Identify the DS6000 117
- 9.6.5 Resynchronize target 118
- Full volume FlashCopy 121
- Data set FlashCopy 125
- Consistency Group FlashCopy 127
- Incremental FlashCopy 127
- Full volume background copy 128
- FlashCopy NOCOPY option 128
- Inband FlashCopy 130
- FlashCopy performance 135
- Terminology 136
- 10.1.3 Rank geometry 137
- 10.1.4 Incremental FlashCopy 137
- 10.6 FlashCopy scenarios 140
- FlashCopy examples 145
- 11.1.1 One-time test system 146
- 11.2 Create a backup 147
- Metro Mirror 151
- Metro Mirror overview 153
- 12.1 Metro Mirror overview 154
- 12.3 Data consistency 155
- 12.4 Rolling disaster 156
- Metro Mirror options and 157
- 13.2 Failover and failback 158
- Consistency Group option 161
- Application 162
- 13.3.4 Critical attribute 165
- 13.4.1 Fibre Channel links 167
- 13.4.2 Logical paths 168
- 13.5 Bandwidth 169
- 13.6 LSS design 169
- DS6000 #1 DS6000 #2 170
- 13.10 Hardware requirements 172
- Metro Mirror interfaces 173
- 14.2.1 Commands overview 176
- 14.2.2 CESTPAIR 176
- 14.2.3 CESTPATH 177
- 14.2.4 CDELPAIR 178
- 14.2.5 CDELPATH 178
- 14.2.6 CGROUP 178
- 14.2.7 CQUERY 179
- 14.2.8 CRECOVER 180
- 14.3 ICKDSF 181
- 14.3.3 PPRCOPY DELPAIR 183
- 14.3.4 PPRCOPY DELPATH 184
- 14.3.5 PPRCOPY ESTPATH 184
- 14.3.6 PPRCOPY ESTPAIR 185
- 14.3.7 PPRCOPY FREEZE 185
- 14.3.8 PPRCOPY QUERY 185
- 14.3.9 PPRCOPY RECOVER 188
- 14.3.10 PPRCOPY SUSPEND 188
- 14.3.11 PPRCOPY RUN 188
- 14.3.12 Refreshing the VTOC 188
- 14.6 DS Storage Manager GUI 196
- Next, the panel shown in 201
- 14.7 ANTRQST API 203
- Metro Mirror performance and 205
- 15.1 Performance 206
- 15.2 Scalability 207
- Metro Mirror examples 209
- Resynchronize the pair 210
- 16.2.1 Failover process 211
- Syslog messages 212
- 16.2.2 Failback process 213
- Establish a volume pair 219
- 51% of tracks copied so far 220
- Global Copy 223
- Global Copy overview 225
- Figure 17-1 Global Copy 226
- Copy Pending 227
- Full Duplex 227
- Global Copy options and 229
- 18.2 Catch-up transition 231
- Secondary Site 234
- Primary Site 234
- 18.5 Hardware requirements 237
- 18.6 DS6800 I/O ports 238
- I0100 I0101 I0102 I0103 238
- I0000 I0001 I0002 I0003 238
- 18.7.1 Fibre Channel links 239
- 18.8 Distance considerations 240
- Global Copy performance and 243
- 19.1 Performance 244
- 19.2 Scalability 244
- Global Copy interfaces 245
- 20.2.2 CESTPAIR 248
- 20.2.3 CESTPATH 249
- 20.2.4 CDELPAIR 249
- 20.2.5 CDELPATH 249
- 20.2.6 CGROUP 250
- 20.2.7 CQUERY 251
- 20.2.8 CRECOVER 251
- 20.2.9 CSUSPEND 252
- DS CLI supported environments 253
- 20.5 DS Storage Manager 257
- 20.5.2 Metro Mirror panel 258
- Global Copy examples 261
- FC Switch 262
- I0000 I0100 I0000 I0100 262
- 21.2.2 Cascading alternative 268
- Global Mirror overview 269
- SecondaryPrimary 270
- Subsystem 271
- Database 271
- Summary 277
- Remote site 278
- Local site 278
- 22.3.4 Introduce FlashCopy 281
- 22.4 Consistency Groups 284
- Tertiary 285
- 1 2 31 2 3 286
- Global Mirror 289
- Global Mirror options and 291
- Subordinate 293
- Consistency Group 293
- Local Site 293
- Remote Site 293
- Start Global Mirror session 300
- Local site Remote site 301
- Remote siteLocal site 304
- 23.7.2 Primary site failure 306
- Secondary 307
- Action required 310
- Failback B to A 316
- 23.7.9 Return to local site 317
- 23.7.10 Conclusions 320
- Global Mirror interfaces 321
- FlashCopy 323
- MODE(ASYNC) 323
- TSO commands 326
- DS Storage Manager 326
- ANTRQST Macro 326
- 24.3.2 Define paths 327
- To remote site 328
- LCU: 2C00 329
- LCU: 3C00 329
- LCU: 3E00 331
- 24.5.2 Define paths 338
- Remote site (secondary) 340
- Local site (primary) 340
- 24.5.7 Start Global Mirror 345
- 24.6 ANTRQST macro 351
- 24.7 DS Storage Manager GUI 352
- Pause; see Figure 24-19 354
- 01 is paused 355
- Resume, from 356
- Hold write I/O 361
- Global Mirror examples 365
- 26.2.5 Timing information 369
- 26.3.1 Define paths 370
- Example 26-8 371
- FAILBACK 382
- Restart Global Mirror session 384
- 26.5.6 Remove the paths 389
- 26.9.1 Create paths 398
- Define as Consistency Group 400
- Create to 401
- Back to correct any of 405
- , select from the 408
- Refresh 412
- 26.10.1 DS CLI profile files 414
- 26.10.2 Create paths 415
- 26.13.5 Remove paths 430
- Example 26-78 rmpprcpath 431
- Interoperability 433
- Combining Copy Service 435
- 27.1 Data migration 436
- Ter t i ar y 437
- 28.2.3 Network connectivity 440
- User ID management 444
- 28.3.1 Decoding port IDs 445
- Adding or deleting paths 446
- 28.7 z/OS Global Mirror 452
- Solutions 455
- 29.2.3 Network connectivity 458
- Administration access level 459
- Real-time manager 460
- Manage hardware 460
- Storage complexes 460
- Storage management 461
- Determining ESS volume size 462
- 29.3.1 Decoding port IDs 463
- Figure 29-4 Path panel 464
- Next to continue. In 465
- ESS Specialist 468
- Figure 29-11 Metro Mirro 471
- Figure 29-12 Pairing method 471
- Figure 29-16 Copy options 473
- IIBM TotalStorage Rapid Data 481
- Recovery 481
- 30.1 Introduction 482
- 30.2 Overview 482
- Secondar 483
- Left side disk data 484
- 30.3 Architecture 486
- AIX – Backup PCM 487
- Storage Server (s) 487
- AIX – Primary PCM 487
- function and 488
- 30.4 Additional information 489
- Center for Replication 491
- Standard Edtion Replication 492
- 31.4.1 FlashCopy 494
- 31.4.2 Metro Mirror 495
- 31.4.3 Global Copy 495
- 31.4.4 Global Mirror 495
- PPR link 497
- Copy Set 498
- Remote SiteLocal site 499
- 31.8 Volumes in a copy set 501
- 31.8.1 Host volume 502
- 31.8.2 Target volume 502
- 31.8.3 Journal volume 502
- IP Communication 504
- Services 504
- Session 508
- 31.13 Supported platforms 509
- URL of GUI (RM server) 511
- IP network 512
- password 513
- URL of GUI (RM server) 513
- user name 513
- Health Overview 514
- Sessions 514
- Storage Subsystems 514
- ESS/DS Paths 514
- 31.15.3 Sessions panel 515
- (1) Select session 516
- (2) Select action 516
- Panel heading 517
- Hyper links 517
- Interface to functional tasks 517
- RM summary 517
- 31.15.7 Advanced Tools panel 520
- 31.15.8 Console log 521
- Figure 31-27 Console log 522
- GDPS overview 525
- 32.1 GDPS solution offerings 526
- 32.1.1 GDPS/PPRC overview 527
- 32.1.2 PPRC and HyperSwap 528
- 32.1.3 RCMF/PPRC overview 528
- 32.1.4 GDPS/XRC overview 529
- 32.1.5 RCMF/XRC overview 529
- GDPS PPRC/XRC 530
- System z 531
- GDPS/PPRC HyperSwap Manager 532
- GDPS/PPRC and GDPS/XRC 532
- Concurrent Copy 533
- Concurrent Copy operation 536
- Invoking Concurrent Copy 536
- Concurrent Copy on the DS6000 536
- Sizing and requirements 537
- Where to use Concurrent Copy 538
- SMF information 539
- DFSMSdss: FlashCopy example 540
- Installation options exit 542
- SNMP notifications 543
- SNMP overview 544
- Physical connection events 544
- Remote copy events 546
- Global Mirror related events 546
- Master cannot terminate the 547
- Licensing 549
- Licenses 550
- Authorized level 551
- CLI migration 553
- Migrating ESS CLI to DS CLI 554
- Convert the individual tasks 555
- DS CLI commands 556
- ESS / DS CLI comparison 556
- Related publications 561
- Online resources 562
- How to get IBM Redbooks 563
- Help from IBM 563
- Numerics 565
- Services with IBM System z 575
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