HP XP Racks - Manual (Page 76)

Related topics
For more information about troubleshooting other types of errors, see the HP XP P9000 Continuous
Access Synchronous User Guide.
Recovery of data stored only in cache memory
When a hardware failure occurs while the storage system is running, data in cache memory may
not be written to data drives. In this case, the data stored only in cache memory is referred to as
a pinned track. Pinned tracks can occur on volume pair drives and on quorum disks. You can
recover pinned tracks.
Pinned track recovery procedures
You can use one of the following procedures to recover pinned tracks from volume pairs and
quorum disks. The procedure you use depends on the type of data drive:
•
“Recovering pinned tracks from volume pair drives” (page 76) .
•
“Recovering pinned tracks from quorum disks ” (page 76) .
Recovering pinned tracks from volume pair drives
When you recover pinned tracks from volume pair drives, you release the volume pair before you
recover the pinned track. This is required because the primary storage system automatically suspends
the volume pair when a pinned track occurs on a P-VOL or S-VOL.
1.
On the primary storage system, release the pair containing the volume with the pinned track.
2. Recover data from the pinned track.
For more information about recovering data from pinned tracks, see the pinned track recovery
procedures for your operating system or contact your HP representative for assistance.
3. Connect to the primary storage system.
4. Resynchronize the pair using the Entire Volume initial copy option.
Recovering pinned tracks from quorum disks
When you recover pinned tracks from quorum disks, you release all volume pairs that use the disk
before you recover the pinned track (the data in cache memory).
NOTE: Host tools cannot be used to recover a pinned track on the quorum disk.
1. Connect to the primary storage system and release all the pairs that use the quorum disk with
the pinned track.
2. On the primary and secondary storage systems, delete the quorum disk ID. If you cannot
release the ID, forcibly delete it.
For more information about deleting quorum disk IDs by system attribute, see “Deleting quorum
disk IDs by system attribute (forced deletion)” (page 45) .
3. Format the quorum disk and recover data from the pinned track.
For more information about recovering pinned tracks, see the recovery procedures for your
operating system or contact your HP representative for assistance.
4. On the primary and secondary storage systems, add the quorum disk ID.
5. On the primary storage system, recreate the released volume pair (or pairs) using the Entire
Volume initial copy option.
76 Troubleshooting