Hp 3PAR Operating System Software Uživatelský manuál Strana 194
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Hodnocené. / 5. Na základě hodnocení zákazníků
28 Volume Group Modes
See:For information on:
“Overview of Volume Group Modes” (page 194)Comparison of the two types of modes
“Synchronous Mode” (page 194)How Remote Copy volume groups operate in synchronous
mode
“Asynchronous Periodic Mode” (page 195)How Remote Copy volume groups operate in asynchronous
periodic mode
Overview of Volume Group Modes
DescriptionVolume Group Mode
Synchronous mode volume groups stay synchronized at
all times.
synchronous (in output: sync)
Data integrity is greater than in asynchronous periodic
mode, but writes can take longer.
Asynchronous periodic mode volume groups resynchronize
periodically, either automatically or manually.
asynchronous periodic (in output: periodic)
Writes can be faster than in synchronous mode, but data
is not always in sync.
Synchronous Mode
When Remote Copy volume groups operate in synchronous mode, the host initiates the write on
both the primary and the backup storage systems before the application acknowledges the host
write [Figure 36 (page 195)].
1. The host sends a write request to the primary storage system.
2. Remote Copy writes the data to the caches of at least two nodes on the primary system (up
to four if configured for RCIP). This redundancy enables synchronization to continue if one
node fails before the write is replicated.
3. Concurrently, Remote Copy sends the write request through a communication link to the backup
system.
4. Remote Copy writes the replicated data to the caches of at least two nodes on the backup
storage system.
5. Remote Copy sends an acknowledgement that replication is complete from the backup system
to the primary system.
194 Volume Group Modes
- 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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