HP XP P9500 Storage - Manual (Page 49)

Recovering failed S-VOL in the primary system
When the P-VOL and S-VOL have been swapped, and then a failure occurs in the primary system
S-VOL, the secondary system P-VOL accepts and continues accepting host I/O. Recover the primary
system S-VOL as follows.
Procedure 30 To recover the primary system S-VOL:
1. Using multipath software, make sure that the secondary system is receiving I/O.
2. Stop I/O from the host.
3. Perform the Pairsplit-S operation on the secondary system P-VOL to release the pair.
4. Clear the failure in the primary system P-VOL. If you use an external volume as the P-VOL,
clear the failure in the external volume. Contact HP Technical Support for assistance.
5. Make sure that no other failures occurred in the primary system. The system should be ready
to accept host I/O.
6. On the secondary system, create a Continuous Access Synchronous pair from the original
S-VOL to the P-VOL. Data flow is from secondary to primary systems.
7. If using RAID Manager, continue with this step. If using Remote Web Console, skip to the next
step.
1.
On the primary system, execute the RAID Manager horctakeover command on the
new Continuous Access Synchronous S-VOL. This reverses the P-VOL/S-VOL relationship;
the S-VOL on the primary system now becomes the P-VOL.
2. On the primary system, split the Continuous Access Synchronous pair.
3. On the primary system, use Remote Web Console to perform the Pairresync operation
to change the Continuous Access Synchronous pair to an ESAM pair.
8. If using Remote Web Console, continue as follows:
1.
On the secondary system, when status is PAIR, release the Continuous Access Synchronous
pair.
2. On the primary system, create the ESAM pair.
9. On both the primary and secondary systems, make sure that the pair volume's Type field is
ESAM.
10. Using multipath software, vary the owner path online.
11. Restart I/O.
Recovering failed P-VOL in the secondary system
When the P-VOL and S-VOL have been swapped following a failover to the primary system, and
then a failure occurs in the secondary system, I/O to both systems stops. Recover the secondary
system P-VOL as follows.
Procedure 31 To recover the secondary system P-VOL:
1. Make Sure that I/O is stopped.
2. Using multipath software, vary the non-owner path offline.
3. On the secondary system, perform the Pairsplit-S operation on the P-VOL to release the ESAM
pair.
4. Clear the failure in the secondary system P-VOL. If you use an external volume as the P-VOL,
clear the failure in the external volume. Contact HP Technical Support for assistance.
5. Clear any failure on the primary system so that it is able to accept I/O.
6. On the primary system, create the pair (Paircreate(ESAM)).
7. On both the primary and secondary systems, make sure that the pair volume's Type field
displays ESAM.
8. Using multipath software, vary the owner and non-owner paths online.
9. Restart host I/O.
Recovery from blocked P-VOL or S-VOL 49