HP StorageWorks XP Remote Web Console Software - Manual (Page 199)

B Recovering a Pinned Track
If a hardware failure occurs when the storage system is in operation, some data in the cache
memory of the storage system may not be written to disk drives and may remain in the cache
memory. Data that remains in cache memory due to such a reason is referred to as "pinned track".
Recovering a Pinned Track on a Data Volume
If a pinned track occurs on a URz primary or secondary data volume, the primary storage system
will suspend the data volume pair (SIM reference code = D41x, D42x, DB1x, DB2x). Use the
following procedure to ensure full data integrity of the data volume pair while recovering the pinned
track:
1. Connect to the primary storage system and select the correct CU image.
2. Release the data volume pair that contains the volume with the pinned track.
3. If the volume is offline (e.g., secondary data volume has pinned track), vary the volume online.
4. Perform your usual procedure for recovering data from a pinned track. Refer to the pinned
track recovery procedures for your operating system, or contact your HP representative for
assistance in recovering the pinned track.
5. If the volume was previously offline (for example, secondary data volume. See step 3 ), make
sure to vary the volume offline again.
6. Use the Add Pair command in the Pair Operation window to recover the data volume pair.
Make sure to select the Entire initial copy option in the Add Pair window.
Recovering a Pinned Track on a Journal Volume
If a pinned track occurs on a URz master or restore journal volume, the procedure for pinned track
recovery is as follows:
1. Identify the journal group that contains the journal volume where a pinned track occurs. After
that, split the mirror where the journal group belongs.
2. Delete the journal volume containing the pinned track from the journal group.
3. Format the journal volume by using the LDEV format function of VLL. For detailed instructions
on how to format the volume, refer to Virtual LVI/LUN and Volume Shredder user's guide.
4. Register the formatted volume (or another volume that can be used instead of the formatted
volume) in the journal group.
If you do not need to resume copying, the procedure is now finished.
If you want to resume copying, continue to restore the mirror to which the journal group belongs
(see
Restoring a Mirror (Resuming a copy operation) ).
Recovering a Pinned Track on a Data Volume 199