HP XP Racks - Manual (Page 58)

1. Use the multipath software to vary the non-owner path offline.
2. On the primary storage system, release the pair by running the pairsplit-S RAID Manager
command on the P-VOL.
3. On the primary storage system, make sure that P-VOL status is SMPL.
4. On the primary storage system, delete the quorum disk ID. If a failure in the quorum disk
prevents deletion, forcibly delete it.
5. On the secondary storage system, delete the quorum disk ID. You can forcibly delete it, if
necessary.
6. On the primary storage system, run the Disconnect External Volumes command on
the quorum disk. If the connection to the quorum disk cannot be released due to the failure of
the quorum disk, skip the Disconnect External Volumes operation.
7. On the secondary storage system, run the External Storage Disconnect External
Volumes
command on the quorum disk. If the connection to the quorum disk cannot be
released due to the failure of the quorum disk, do not run this command.
8. Replace the quorum disk.
9. On both systems, run the Reconnect External Volumes command on the quorum disk.
10. On both systems, add the quorum disk ID.
11. On the primary storage system, run the Paircreate(ESAM) command to create the ESAM
pair.
12. On both the primary and secondary storage systems, make sure that Type shows ESAM.
13. Use the multipath software to vary the non-owner path online.
Replacing a quorum disk when the RCU is receiving host I/O
Replacing the disk involves preparing the systems and the volume pair (or pairs) connected to the
disk so that you can safely remove the failed disk and replace it. After it is replaced, you reconnect
the systems to the disk, add the disk ID, and re-create the volume pair (or pairs).
When you replace a disk, data on the disk is erased and you cannot continue using ESAM.
CAUTION: To prevent host I/O from stopping, make sure you complete the steps exactly as they
are listed in the procedure.
You can use RWC or RAID Manager to complete the recovery procedure.
TIP: Some of the steps can be done using either RWC or RAID Manager. Typically, you can
complete these steps quicker using RAID Manager.
1. Stop I/O from the host.
2. On the secondary storage system, run the pairsplit-S RAID Manager command on the
P-VOL to release the ESAM pair.
3. On the secondary storage system, make sure that P-VOL status is SMPL.
4. On the secondary storage system, create a Continuous Access Synchronous pair. The data
flow is from secondary to primary storage system.
5. Perform one of the following operations:
•
If changing the Continuous Access Synchronous pair to a ESAM pair on the primary
storage system: Run the RAID Manager horctakeover command on the S-VOL. This
reverses the relationship of the pair.
•
If using RAID Manager to create a ESAM pair again, on the primary storage system, run
the pairsplit command on the S-VOL and release the Continuous Access Synchronous
pair.
•
If using RWC, from the secondary storage system, release the Continuous Access
Synchronous pair.
58 Disaster recovery