HP XP P9500 Storage - Manual (Page 100)

CAUTION: When 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 multitarget configuration (see
“Recovering from primary site failures (when delta resync
operation is performed)” (page 98) ), the status of a pair between the primary site and the Continuous
Access Journal 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 14 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: COPY 1. Make sure that the status of the pair in the primary site is PSUE or PSUS.
Cnt Ac-J secondary site: HOLD 2. Release the Cnt Ac-J pair from the primary site.
3. Make sure that all the pairs belonging to the journal in the primary site
are released.
Primary site: PAIR
Cnt Ac-J secondary site: HOLD
4. Create a Cnt Ac-J delta resync pair that extends from the primary site to
the Cnt Ac-J secondary site.
Primary site: PSUE or PSUS 1. Release the Cnt Ac-J pair from the primary site.
Cnt Ac-J 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 delta resync pair that extends from the primary site to
the Cnt Ac-J secondary site.
Change the status of the HLDE pair back to HOLD. Primary site: HLDE
Cnt Ac-J secondary site: HOLD
Primary site: SMPL 1. Release the pair in HOLD status from the Cnt Ac-J secondary site.
Cnt Ac-J secondary site: HOLD 2. Create a Cnt Ac-J delta resync pair that extends from the primary site to
the Cnt Ac-J secondary site.
Recovering from failures in the primary site and the Continuous Access Synchronous
secondary site
If a disaster or failure occurs in both the primary site and the Continuous Access Synchronous
secondary site in a 3DC multitarget configuration, you can resume your business tasks by using
the secondary volume in the Continuous Access Journal secondary site. After you transfer business
tasks to the Continuous Access Journal secondary site, remove failures from the primary site and
the Continuous Access Synchronous secondary site, so that you will be able to transfer business
tasks back to the primary site.
To transfer your business tasks to the Continuous Access Journal secondary site, follow the procedure
below. RAID Manager (RAID Manager) is used in this procedure:
1.
Use RAID Manager to execute the horctakeover command on the Continuous Access Journal
pair.
2. Use the volume in the Continuous Access Journal secondary site to resume your business tasks.
100 Disaster recovery operations