HP XP7 Storage User Manual
Page 109
Depending on the result, proceed as follows:
If the original Cnt Ac-S Z data flow reverses
1.
Re-create the Cnt Ac-J Z pair using the YKMAKE command from the Cnt Ac-S Z local site to
the Cnt Ac-J Z remote site. This results in a 3DC cascade configuration, with the original Cnt
Ac-S Z S-VOL as the primary volume. See the lower right configuration in the following figure.
2.
Restore the local site or data path, or both. This must be done before proceeding.
3.
Stop host operations to the Cnt Ac-S Z intermediate site.
4.
Suspend the Cnt Ac-S Z pair using the YKSUSPND FORWARD command.
5.
Resume host operations to the Cnt Ac-S Z P-VOL in the local site.
6.
Run the YKRESYNC FORWARD command to resume the Cnt Ac-S Z pair with replication again
from the original Cnt Ac-S Z P-VOL in the local site to the Cnt Ac-S Z S-VOL in the intermediate
site.
The system changes back to the original 3DC multi-target configuration.
If the original Cnt Ac-S Z data flow did not reverse
1.
To back up the data, create a new Cnt Ac-J Z pair using YKMAKE from the Cnt Ac-S Z S-VOL
in the intermediate site to the Cnt Ac-J Z secondary volume in the remote site.See the upper-right
configuration in the following figure.
2.
Restore the local site or data path, or both. This must be done before proceeding.
3.
Release the Cnt Ac-J Z pair using the YKDELETE command.
4.
Resynchronize the Cnt Ac-S Z pair using the YKRESYNC command to start the replication to
the local site.
5.
Release the current Cnt Ac-J pair, which extends between the Cnt Ac-S remote site and the
Cnt Ac-J Z remote site.
6.
Stop host operations at the Cnt Ac-S Z intermediate site.
7.
Suspend the Cnt Ac-S Z pair using the YKSUSPND FORWARD command.
8.
Resume host operations to the local site Cnt Ac-S Z volume.
9.
Resynchronize the Cnt Ac-S Z pair from the local site using the YKRESYNC FORWARD
command. Replication is again from the original Cnt Ac-S Z P-VOL to the original S-VOL.
10. Re-create the Cnt Ac-J Z pair from the local site to the remote site using the YKMAKE command.
The system is now changed back to the original 3DC multi-target configuration.
Recovery for 3 Cnt Ac-J Z/Cnt Ac-S Z data centers 109