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Chapter 25. Global Mirror performance and scalability 337
There is potential impact on the Global Copy data replication operation, depending on
whether persistent memory or non-volatile cache is over-committed in the secondary storage
disk subsystem. In this situation, the FlashCopy source tracks might have to be preserved
first to the FlashCopy target volume, before the Global Copy write completes. Usually,
however, all writes are quick writes to cache and persistent memory.
A write I/O to the FlashCopy source volume also triggers the maintenance of a bitmap for the
source volume, which is created when the FlashCopy volume pair is established with the
start
change recording
attribute. The maintenance process means that you only have to replicate
the changed recording bitmap to the corresponding bitmap for the target volume in the course
of formation of a Consistency Group. See 22.4, “Consistency Groups” on page 260, for more
information about this topic.
Note that this all applies only to write I/Os to the Global Mirror primary volumes.
25.2 Performance considerations at coordination time
When you look at the three phases that Global Mirror goes through to create a set of data
consistent volumes at the secondary site, the first question that comes to mind is whether the
coordination window imposes an impact to the application write I/O; see Figure 25-2.
Figure 25-2 Coordination time - how it impacts application write I/Os
The coordination time, which you can limit by specifying a number of milliseconds, is the
maximum impact to the write I/Os of an application, that you will allow when forming a
Consistency Group. The intention is to keep this time window as small as possible. The
default 50 ms might be a bit high in a transaction processing environment. A valid number
could also be a very low number in the single digit range. The required communication
between the master storage disk subsystem and subordinate storage disk subsystems is
inband, over the Global Mirror session paths between the master and subordinates. This
communication is highly optimized and allows you to minimize the potential application write
I/O impact to 3 ms, for example. This communication is performed over FCP links. At least
one FCP link is required between a Master storage disk subsystem and any potential
Subordinate storage disk subsystems. For redundancy, we suggest using two FCP links.
Maximum
coordination
time
drain
time
Maximum
2
Serialize all
Global Copy
primary volumes
Drain data from local to remote site
Perform
FlashCopy
1
3
Primary
A2
Primary
A1
B2
Secondary
B1
Secondary
C2
Tertiary
C1
Tertiary
Hold write I/O
I/O
Write
Global Copy paths
Remote siteLocal site
Global Mirror
session paths
Global Copy paths
- 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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