HP XP Continuous Access Software - Manual (Page 225)

14 Pinned track recovery for
Continuous Access XP Journal
volumes
If a hardware failure occurs when the array is in operation, some data in the array's cache memory might
not be written to disk drives and might remain in cache memory. Data remaining in cache memory due
to such a reason is referred to as a “pinned track.
If a pinned track occurs on a Continuous Access XP Journal primary or secondary data volume, the
primary array suspends 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 array.
2. Delete the data volume pair containing the volume with the pinned track (see Deleting a pair of
data volumes ).
3. If the volume is offline (for example, secondary data volume has a pinned track), vary the volume
online.
4. Perform your usual procedure for recovering data from a pinned track. See the pinned track recovery
procedures for your operating system, or contact your HP account representative for assistance in
recovering the pinned track.
5. If the volume was previously offline (for example, secondary data volume, see step 3), vary the
volume offline again.
6. Use the Paircreate command in the Pair Operation pane (see Creating a pair of data volumes
(Paircreate) ) to recover the data volume pair. Select the Entire initial copy option in the Paircreate
pane.
If a pinned track occurs on a Continuous Access XP Journal master or restore journal volume, use the
following procedure to recover the pinned track:
1. Identify the journal group containing the journal volume where a pinned track occurs. Split the mirror
where the journal group belongs (see Splitting mirrors (Pairsplit-r: suspending copy operations) ).
2. Delete the journal volume containing the pinned track from the journal group (see Deleting journal
volumes from journal groups ).
3. Format the journal volume using the LDEV format function of Volume Manager. For instructions on
formatting the volume, see the HP StorageWorks LUN Configuration and Security Manager XP
user guide for the XP12000/XP10000/SVS200.
4. Register the formatted volume (or another volume that can be used instead of the formatted volume)
in the journal group (see Registering journal volumes in journal groups ).
• If you do not need to resume copying, the procedure is finished.
• To resume copying, continue to restore the mirror to which the journal group belongs (see
Restoring mirrors (Pairresync: resuming copy operations) ).
Continuous Access XP Journal user guide 225