Recovery in a delta resync configuration – HP XP P9500 Storage User Manual
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5.
Release the current Cnt Ac-J pair, which extends between the Cnt Ac-S secondary site and the
Cnt Ac-J secondary site.
6.
Stop host operations at the Cnt Ac-S intermediate site.
7.
Run the horctakeover command on the Cnt Ac-S pair.
8.
Resume host operations to the primary site Cnt Ac-S volume.
9.
Re-create the Cnt Ac-J pair from the primary site to the remote site. The system is now changed
back to the original 3DC multi-target configuration.
Figure 14 Recovery scenarios
Recovering from primary and secondary 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 primary site.
Procedure 36 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 secondary 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 secondary site.
6.
Run the horctakeover command on the Cnt Ac-J pair.
7.
Resume host operations at the primary 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 primary site in a delta resync configuration. Then you
run the delta resync operation. When the failure at the primary site is corrected, host operations
are transferred back to the primary site and the delta resync configuration is reestablished.
Recovery for 3 Cnt Ac-J/Cnt Ac-S data centers and 3 Cnt Ac-J data centers
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