HP XP P9500 Storage User Manual
Page 108
Running the YKRESYNC REVERSE results in one of the following conditions:
•
The original copy flow of the primary-remote site pair reverses and flows from the
primary-remote secondary volume to the primary volume.
•
The original copy flow does not reverse because of failure in the primary site or data path.
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 primary 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
.
2.
Restore the primary 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 S-VOL in the primary 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 S-VOL in the primary 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
.
2.
Restore the primary 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 primary site.
5.
Release the current Cnt Ac-J pair, which extends between the Cnt Ac-S secondary site and the
Cnt Ac-J Z secondary 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 primary site Cnt Ac-S Z volume.
9.
Resynchronize the Cnt Ac-S Z pair from the primary site using the YKRESYNC FORWARD
command. Replication is again from the original Cnt Ac-S Z S-VOL to the original S-VOL.
10. Re-create the Cnt Ac-J Z pair from the primary site to the remote site using the YKMAKE
command. The system is now changed back to the original 3DC multi-target configuration.
108 Disaster recovery operations