Operating System Software Owner manual

23 Disaster Recovery for Synchronous Long Distance
Before you begin disaster recovery:
Figure 27 (page 135)1. Acquaint yourself with the example Remote Copy pair
used to illustrate synchronous long distance disaster
recovery.
“System Information during Normal Operation” (page 135)2. Familiarize yourself with system information for
synchronous long distance configurations.
“System Information during Failover” (page 138)3. Understand the system information to look for during a
failover and read an overview of the disaster recovery
procedure.
Recover the systems:
Choose the best disaster recovery method:
“Failing Over to the Synchronous Backup System”
(page 140)
• Make the synchronous backup system (usually the local
backup system) primary.
“Failing Over to the Asynchronous Periodic Backup System
(with Data Transfer)” (page 151)
• First send data from the synchronous backup system to
the asynchronous periodic backup system (usually the
remote backup system), then make the asynchronous
periodic backup system primary.
“Failing Over to the Asynchronous Periodic Backup System
(No Data Transfer)” (page 167)
• Make the asynchronous periodic backup system primary
without sending data from the synchronous backup
system.
Additional Information:
• “About the Remote Copy Commands” (page 222)
• “Quick Disaster Recovery Guide” (page 220)
The disaster recovery steps for synchronous long distance configurations refer to the example setup
illustrated in Figure 27 (page 135).
134 Disaster Recovery for Synchronous Long Distance