HP XP P9500 Storage - Manual (Page 111)

5. Use the main volume in the primary site to resume your business tasks.
6. Use Business Continuity Manager to execute the YKRESYNC FORWARD command on the
Continuous Access Synchronous Z pair.
The copy direction of the pair is returned to its original direction.
7. Perform delta resync operation on the volume in the Continuous Access Synchronous Z primary
site.
The status of the data volumes of Continuous Access Journal Z pair changes as explained in
the following table.
Table 19 Changes of Continuous Access Journal Z pair status by delta resync operation (when
business tasks are transferred from Continuous Access Synchronous Z secondary site to the primary
site)
Pair status after delta resync operation Pair status before delta resync operation Cnt Ac-J Z pair
S-VOL P-VOL S-VOL P-VOL
Duplex or Pending
Duplex Duplex or Pending
Duplex Hold Hold Cnt Ac-J Z pair
between Cnt Ac-S
Z primary site
and Cnt Ac-J Z
secondary site
Hold Hold Duplex or Suspend Duplex or Suspend Cnt Ac-J Z pair
between Cnt Ac-S
Z secondary site
and Cnt Ac-J Z
secondary site
Caution on transferring business tasks back to the primary site when using delta resync:
After you remove failures from the primary site and other locations and then the system is changed
to 3DC multi target configuration (see
“Recovering from primary site failures (when delta resync
operation is performed)” (page 109) ), the status of a pair between the primary site and the Continuous
Access Journal Z secondary site may be abnormal. If the status of the pair remains abnormal, you
will be unable to transfer your business tasks back to the primary site. To solve this problem, see
the following table, check the pair status and then perform a problem solving operation before
transferring business tasks back to the primary site.
If pair status in the primary and secondary site is Hold, the pair is in normal condition. So, you
can transfer business tasks to the primary site as described earlier in this section. In any other
cases, see the following table and change the pair status to normal status before transfer business
tasks back to the primary site.
Table 20 Pair status and operation after recovery of the primary site
Do the following before transferring business tasks back to the primary site Invalid pair status
Primary site: Pending Duplex 1. Make sure that the status of the pair in the primary site is Suspend.
Cnt Ac-J Z secondary site: Hold
2. Release the Cnt Ac-J Z pair from the primary site.
3. Make sure that all the pairs belonging to the journal in the primary site
are released.
Primary site: Duplex
Cnt Ac-J Z secondary site: Hold
4. Create a Cnt Ac-J Z delta resync pair that extends from the primary site
to the Cnt Ac-J Z secondary site.
Primary site: Suspend 1. Release the Cnt Ac-J Z pair from the primary site.
Cnt Ac-J Z secondary site: Hold 2. Make sure that all the pairs belonging to the journal in the primary site
are released.
3. Create a Cnt Ac-J Z delta resync pair that extends from the primary site
to the Cnt Ac-J Z secondary site.
Recovery procedures with shared volumes 111