HP XP7 Continuous Access Journal User Guide (TK911-96002)

Recovering from local and remote site failure (3DC multi-target)
Host operations are transferred to the Continuous Access Journal S-VOL in the remote site when a
disaster or failure occurs in both the primary and Continuous Access Synchronous intermediate
sites in a 3DC multi-target configuration. Failures are corrected at the two sites and then host
operations are transferred back to the local site.
Procedure 35 To recover a primary and Cnt Ac-S intermediate site failure
1. Run the horctakeover command on the Cnt Ac-J pair.
2. Resume host operations at the Cnt Ac-J remote site.
3. Release the Cnt Ac-S pair.
4. Make sure the Cnt Ac-J pair is resynchronized so that the copy flow is from S-VOL to P-VOL.
5. Stop host operations at the Cnt Ac-J remote site.
6. Run the horctakeover command on the Cnt Ac-J pair.
7. Resume host operations at the local site.
8. Make sure the copy flow of the Cnt Ac-J pair is from P-VOL to S-VOL. If it is not, resynchronize
the pair.
9. Re-create the Cnt Ac-S pair.
The system is now changed back to the original 3DC multi-target configuration.
Recovery in a delta resync configuration
Host operations are transferred to the Continuous Access Synchronous S-VOL in the intermediate
site when a disaster or failure occurs in the local site in a delta resync configuration. Then you run
the delta resync operation. When the failure at the local site is corrected, host operations are
transferred back to the local site and the delta resync configuration is reestablished.
Recovery for 3 Cnt Ac-J/Cnt Ac-S data centers 91