Operating System Software User Manual

23 Disaster Recovery for M-to-N Configurations
Disaster Recovery for N-to-1 Configurations
Before you begin disaster recovery:
“Unidirectional N-to-1 Remote-Copy Configuration”
(page 181)
1. Review the example remote-copy pair used to illustrate
N-to-1 disaster recovery.
“System Information during Normal Operation for N-to-1
Configurations” (page 182)
2. Review system information for N-to-1 configurations.
“System Information during Failover for N-to-1
Configurations” (page 184)
3. Understand what system information to look for during
a failover.
Recover the systems:
“Recovering from Disaster for N-to-1 Configurations”
(page 184)
1. Change secondary volume groups to primary.
2. Export recovered data if desired.
3. Recover the failed system.
4. Reverse the natural direction of data flow and
synchronize data.
5. Verify that volume groups are started.
6. Restore the natural direction of data flow.
For additional information, see the following:
• “About the Remote-Copy Commands” (page 261)
• “Quick Disaster Recovery Guide” (page 259)
The disaster recovery steps for N-to-1 configurations refer to the setup illustrated in Figure 63
(page 181).
Figure 63 Unidirectional N-to-1 Remote-Copy Configuration
Example backup systemExample second primary
system
Example first primary system
System1System3System2System name
611196System ID
Disaster Recovery for N-to-1 Configurations 181