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For additional information, see the following:
• “Common Provisioning Groups” (page 108)
• “Converting Standard Virtual Volumes” (page 106)
Snapshots in Synchronous Mode
In synchronous mode, remote copy creates snapshots only when:
• An error occurs.
• Disaster recovery is in process.
• A volume group is manually stopped.
Use the createsv -rcopy command to create identical read-only snapshot volumes on both
the primary and secondary node.
The createsv command can also be used to create coordinated snapshots across a full remote-copy
group.
If group 1 contains vv.1, vv.2, ..., vv.n, the createsv command creates sv_vv.1_1,
sv_vv.2_1, ..., vv.n_1. If, however, no pattern is included, then the <sv_name> is used as
a prefix, appended with a period (.).
Snapshots and Initial Synchronization Failure
If a failure occurs during the initial (full) synchronization of a virtual volume:
• Remote copy does not create a snapshot of that volume.
• After you recover the system and restart remote copy, remote copy performs another initial
(full) synchronization of the volume.
Snapshots and Resynchronization
During resynchronization:
• The secondary volume state is syncing.
• The secondary volume is not in a consistent state because updates are written by location
order rather than by time order.
• When the resynchronization completes, remote copy deletes the snapshots on the primary
and the backup systems.
NOTE: For more information about deleted snapshots and space re-allocation, see “How CPGs
Allocate Space for Snapshots” (page 108).
Snapshots and Resynchronization Failure in Synchronous Mode
If the primary system fails during a resynchronization, the secondary base volumes are left in an
inconsistent state, but the snapshots of the secondary volumes are left behind and not deleted.
After you recover the primary system, the next resynchronization brings the secondary volumes
back in synchronization with the primary volumes.
If the primary system fails during a resynchronization and you need to use the backup system to
access data, you must issue failover commands. For more information, see “Recovering from
Disaster” (page 162).
Snapshots in Synchronous Mode 271
- HP 3PAR OS 3.1.3 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- 8 Contents 8
- Contents 9 9
- Servers” (page 39) 12
- Requirements 13
- Requirements 15 15
- 1-to-1 Configuration 16
- N-to-1 Configuration 17
- 1-to-N Configuration 18
- M-to-N Configuration 19
- Network Connection Types 23
- Fibre Channel Networks 24
- 4 Gathering Setup Information 25
- 5 Setting the Transport Layer 26
- RCIP Initial Remote-Copy Pair 27
- Configuring Ports for RCIP 30
- Setting the Gateway 31
- Increasing MTU 33
- Configuring Ports for RCFC 35
- # controlport offline 2:3:1 36
- 1-to-1 Remote Copy 40
- N-to-1 Remote Copy 40
- 1-to-N Remote Copy 41
- ◦ HP 3PAR T-Class Storage 44
- ◦ HP 3PAR F-Class Storage 44
- M-to-N Remote-Copy Examples 45
- # showrctransport -rcfc 48
- # startrcopy 48
- 7 Setting Up SLD Remote Copy 56
- ◦ IP—Specifies an IP link 58
- 60 Setting Up SLD Remote Copy 60
- For RCFC 61
- For RCIP 61
- SLD Remote-Copy Example 62
- # showrcopy groups 69
- Configuration 71
- 72 Setting Up SLD Remote Copy 72
- 74 Setting Up SLD Remote Copy 74
- • For RCIP remote-copy pairs: 77
- • For RCFC remote-copy pairs: 78
- # showrcopy 80
- 9 Bidirectional Configuration 86
- Part III Managing Remote Copy 92
- # stoprcopy -stopgroups 94
- Additional Information 95
- Remote-Copy Pairs 99
- Overview of Targets 99
- Target Definitions 99
- Remote-Copy Target System 100
- Remote-Copy Target System 101 101
- 13 Remote-Copy Links 102
- Links per Remote-Copy Pair 103
- Receiving Links 104
- Growing Virtual Volumes 107
- Renaming Virtual Volumes 108
- Virtual Volumes and CPGs 108
- Basic Information about CPGs 109
- Creating a CPG 109
- 15 Working with Volume Groups 110
- How Volume Groups Work 111
- How Volume Groups Are Named 112
- Unidirectional Volume Groups 113
- Bidirectional Volume Groups 113
- Synchronous Mode 116
- Asynchronous Periodic Mode 116
- Changing One Volume Group 117
- Setting Volume Group Policies 118
- Volume Group Modes 120
- Synchronization 122
- Types of Synchronization 123
- Full Synchronization 124
- Resynchronization 125
- 16 Optimizing Performance 128
- Limiting Throughput 129
- Removing Throughput Limits 130
- HP 3PAR Peer Persistence 134
- HP 3PAR Peer Persistence 135 135
- Manual Transparent Switchover 137
- HP 3PAR Peer Persistence 139 139
- Path Management Policies 149
- Configuring ESX Host Personas 155
- 20 Error Handling 156
- Failure of a Single Link 157
- Target failure 157
- 158 Error Handling 158
- Failure of a Storage System 159
- Write Errors 159
- Read Errors 160
- Read Errors 161 161
- Primary System (System1) 166
- Secondary System (System2) 166
- Switchover 168
- (page 172) 171
- Backup System (System2) 173
- Transfer) 219
- Failover 236
- Recovery 238
- Part V Reference 251
- 25 Quick Setup Guide 252
- (continued) 256
- 27 Using Remote Copy Commands 261
- Issuing Remote-Copy Commands 262
- Starting the vSphere Client 263
- Quorum-Witness CLI Commands 265
- Stopping a Quorum Witness 266
- Removing a Quorum Witness 266
- Quorum Troubleshooting 267
- • Active sysmgr logs 269
- • qw logs on each node 269
- 29 Remote-Copy Snapshots 270
- Snapshots in Synchronous Mode 271
- If the Backup System Fails 272
- If the Primary System Fails 272
- Contacting HP 274
- HP 3PAR documentation 274
- Typographic conventions 277
- HP 3PAR branding information 277
- 31 Documentation feedback 278
- Glossary 279
- 280 Glossary 280
- 282 Index 282
- 284 Index 284
- 286 Index 286
- 288 Index 288
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