HP XP Racks - Manual (Page 64)

4. If a pair is shared by multiple hosts with VMWare, see important recovery information regarding
the horctakeover or pairresync –swaps command in
“Recovery for pairs shared by multiple
hosts with VMware” (page 66) .
5. If a pair is shared by multiple hosts with VMWare, see important recovery information regarding
failover in
“Recovery for pairs shared by multiple hosts with VMware” (page 66) .
Procedure
1. Analyze the failure messages to determine if all conditions required for resynchronization
exist:
•
The ESAM volumes are not blocked.
•
If there was a quorum disk failure, the disk does not need to be replaced.
•
Data was not lost as a result of shared memory initialization caused by a power outage.
2. Use the decision tree in the flowchart to select the correct set of procedures. Use the links
below to go to the appropriate procedures.
Related topics
•
“Recovering primary volume from Business Copy secondary volume” (page 64) .
•
“Recovering secondary volume from Continuous Access Journal primary volume ” (page 64)
Recovering primary volume from Business Copy secondary volume
In some cases, you can use resynchronization to recover the ESAM P-VOL from a Business Copy
S-VOL located on the secondary storage system.
Prerequisites
Make sure you have analyzed the failure messages to determine if all of the conditions required
to use resynchronization exist.
For more information, see “Determining which resynchronization recovery procedure to use”
(page 62) .
Procedure
1. Using multipath software, vary the owner path offline.
2. Swap and suspend the ESAM pair using the RAID Manager pairsplit -RS command.
3. Resynchronize the Business Copy pair on the secondary storage system in the opposite
direction, using the Quick Restore or Reverse Copy operations. The system copies the data in
the Business Copy S-VOL to the ESAM S-VOL.
4. Split the Business Copy pair by running the pairsplit command.
5. Resynchronize the ESAM pair in the opposite direction using the pairresync -swaps command.
The system copies the data in the S-VOL to the P-VOL.
6. Using multipath software, vary the owner path online.
7. Using multipath software, vary the non-owner path offline.
8. When the ESAM P-VOL and S-VOL are in PAIR status, swap and suspend the pair using the
pairsplit -RS
command.
9. Resynchronize the ESAM pair in the opposite direction using the pairresync -swaps
command.
10. Using multipath software, vary the non-owner path online.
Recovering secondary volume from Continuous Access Journal primary volume
In some cases, you can use resynchronization to recover the ESAM S-VOL from a Continuous
Access Journal P-VOL. When you do this, the system automatically splits the Continuous Access
64 Disaster recovery