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1. The host sends a write request to the primary system.
2. As soon as the data is written into cache on the primary system, HP 3PAR Remote Copy
acknowledges the host write.
3. On a resynchronization schedule, HP 3PAR Remote Copy creates snapshots of all virtual
volumes within the volume group on the primary system, and the primary and backup systems
are resynchronized periodically:
• Automatically—according to the schedule specified by the setrcopygroup command
• Manually—when you issue the syncrcopy command
Figure 37 Remote Copy in Asynchronous Periodic Mode
Advantages of Asynchronous Periodic Mode
If one area of a volume is written to multiple times between two resynchronizations, remote copy
needs to send only the last write to the backup system. Therefore, asynchronous periodic mode
remote copy transfers less data overall than synchronous mode remote copy.
For more information, see “Synchronization” (page 122)
Synchronization
See the following:For more information about:
“Types of Synchronization” (page 123)The two types of synchronization that remote copy performs
“Limits on Volumes that Concurrently Synchronize”
(page 123)
The number of virtual volumes that remote copy
synchronizes at the same time
“Asynchronous Periodic Mode Volume Groups” (page 123)How remote copy synchronizes asynchronous periodic
mode volume groups
“Setting Up Resynchronization for Asynchronous Periodic
Mode” (page 126)
Considerations for resynchronizing asynchronous periodic
volume groups
“Synchronous Mode Volume Groups” (page 127)How remote copy synchronizes synchronous mode volume
groups
122 Working with Volume Groups
- 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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