Recovery in a delta resync configuration – HP XP P9500 Storage User Manual
Page 109
Figure 18 Recovery scenarios
Recovering from primary and secondary site failure (3DC multi-target)
Host operations are transferred to the Continuous Access Journal Z S-VOL in the remote site when
a disaster or failure occurs in both the primary and Continuous Access Synchronous Z 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 32 To recover a primary and Cnt Ac-S Z intermediate site failure
1.
Run the YKSUSPND REVERSE command on the Cnt Ac-J Z pair.
2.
Resume host operations at the Cnt Ac-J Z secondary site.
3.
Release the Cnt Ac-S Z pair using the YKDELETE command.
4.
Make sure the Cnt Ac-J Z pair is resynchronized so that the copy flow is from S-VOL to P-VOL.
Use the YKRESYNC REVERSE command to resync the pair.
5.
Stop host operations at the Cnt Ac-J Z secondary site.
6.
Run the YKSUSPND FORWARD command on the Cnt Ac-J Z pair.
7.
Resume host operations at the primary site.
8.
Reverse the copy flow on the Cnt Ac-J Z pair using the YKRESYNC FORWARD command.
Copy flow is returned to its original direction, P-VOL to S-VOL.
9.
Re-create the Cnt Ac-S Z pair using the YKMAKE command.
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 Z 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.
Prerequisite information
•
For information and illustrations on the configuration covered in this procedure, see
.
•
You can specify options for recovery in the event that the delta resync operation fails. See the
Delta resync Failure step in
. This also provides important information if you share
the delta resync S-VOL with Business Copy, Fast Snap, or Snapshot and a THP V-VOL.
Recovery for 3 Cnt Ac-J Z/Cnt Ac-S Z data centers and 3 Cnt Ac-J Z data centers 109