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Figure 4 1-to-N Remote Copy
Synchronous Long Distance Configuration
A Synchronous Long Distance Remote Copy configuration is composed of two Remote Copy pairs.
One primary system uses two backup systems and participates in two pairs: one for each backup
system.
Synchronous Long Distance configurations differ from 1-to-N configurations in that:
• Not every volume group on the Remote Copy systems that are participating in a Synchronous
Long Distance configuration needs to be set up for Synchronous Long Distance replication.
• Each Synchronous Long Distance primary volume group targets two secondary volume groups.
Therefore, the virtual volumes in a single primary volume group on the primary system are
copied directly to two secondary volume groups, one on each of the two backup systems.
• For the Synchronous Long Distance volume groups, one Remote Copy pair must be configured
in synchronous mode and the other in asynchronous mode.
• The Synchronous Long Distance volume groups on the two backup systems are configured
with a standby link for additional failover and recovery options.
Synchronous Long Distance Remote Copy is set up as follows:
Synchronous Long Distance Configuration 17
- User’s Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- 8 Contents 8
- Contents 9 9
- Introduction 10
- Advisories 11
- Servers” (page 42) 12
- Remote Copy System Locations 13
- Additional Information 13
- N-to-1 Configuration 15
- 1-to-N Configuration 16
- If a Backup System Fails 18
- If the Primary System Fails 19
- IP Networks 21
- Fibre Channel Networks 22
- General Considerations 22
- General Requirements 23
- General System Restrictions 23
- General Software Restrictions 24
- Virtual Volume Considerations 25
- N-to-1 Considerations 25
- 1-to-N Considerations 26
- 5 Gathering Setup Information 29
- 6 Setting the Transport Layer 33
- Setting the Gateway 34
- For example: 35
- Increasing MTU (Optional) 37
- Configuring Ports for RCFC 38
- # showport -rcfc 39
- # showrctransport -rcfc 39
- Setting Up the Primary System 47
- Setting Up the Backup System 48
- SolutionProblem 54
- Setting Up the Backup Systems 59
- # showrcopy groups 65
- Example Unidirectional Setup 67
- Example Bidirectional Setup 76
- Part III Managing Remote Copy 85
- Volume Groups 90
- Changing One Volume Group 93
- 17 Modifying Virtual Volumes 95
- Renaming Virtual Volumes 96
- 18 Limiting Throughput 97
- Removing Throughput Limits 98
- 19 Optimizing Performance 99
- Volume Group Mode 100
- Additional Information: 103
- (page 104) 103
- Primary System (System1) 104
- Backup System (System2) 105
- Synchronous Mode 106
- Asynchronous Periodic Mode 106
- Recovering from Disaster 107
- Recovery 108
- Backup System (System1) 114
- First Backup System (System2) 126
- Primary System (SystemA) 135
- Stages of Disaster Recovery 139
- Failover 141
- Transfer) 151
- Part V Remote Copy Concepts 180
- Remote Copy Pairs 181
- Overview of Targets 181
- Target Definitions 181
- Remote Copy Target System 182
- Remote Copy Target System 183 183
- 25 Remote Copy Links 184
- Links per Remote Copy Pair 185
- Receiving Links 186
- 26 Virtual Volumes and CPGs 187
- Basic Information about CPGs 188
- Creating a CPG 188
- 27 Volume Groups 190
- How Volume Groups Work 191
- How Volume Groups Are Named 191
- Unidirectional Volume Groups 192
- Bidirectional Volume Groups 192
- 28 Volume Group Modes 194
- 196 Volume Group Modes 196
- Types of Synchronization 197
- Full Synchronization 198
- Resychronization 199
- Resynchronization 202
- 30 Remote Copy Snapshots 203
- Snapshots in Synchronous Mode 204
- 206 Remote Copy Snapshots 206
- 31 Error Handling 207
- Failure of All Links 208
- Failure of a Storage System 209
- Write Errors 209
- Read Errors 210
- Sync States 211
- Part VI Appendices 212
- A Quick Setup Guide 213
- (continued) 217
- Issuing Remote Copy Commands 223
- D The Remote Copy Commands 224
- 226 The Remote Copy Commands 226
- 228 The Remote Copy Commands 228
- 230 The Remote Copy Commands 230
- AUTHORITY 232
- SUBCOMMANDS 232
- 234 The Remote Copy Commands 234
- SPECIFIERS 235
- RESTRICTIONS 236
- EXAMPLES 236
- 238 The Remote Copy Commands 238
- 240 The Remote Copy Commands 240
- 1:4:1:23410002AC000060 241
- 242 The Remote Copy Commands 242
- # dismissrcopyvv vv1 Group1 244
- 244 The Remote Copy Commands 244
- # growvv vv1 2t 245
- # removercopygroup Group1 249
- 250 The Remote Copy Commands 250
- # removercopytarget System1 251
- # removercopytarget System2 251
- 256 The Remote Copy Commands 256
- 258 The Remote Copy Commands 258
- 260 The Remote Copy Commands 260
- 264 The Remote Copy Commands 264
- 268 The Remote Copy Commands 268
- # showrctransport 269
- # startrcopy 272
- 272 The Remote Copy Commands 272
- # startrcopygroup Group1 273
- 274 The Remote Copy Commands 274
- # stoprcopy -stopgroups 284
- 284 The Remote Copy Commands 284
- # stoprcopygroup Group1 285
- 286 The Remote Copy Commands 286
- # syncrcopy Group1 287
- # syncrcopy -pat testgroup* 288
- 288 The Remote Copy Commands 288
- 290 Index 290
- 292 Index 292
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