HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)
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 sys
tem may not be written to disk drives and may remain in the cache memory . Data that
remains in cach
e
memory due to such a reason is referred to as pinned track.
Recovering aPinnedTrack on aDataVolume
If a pinned track occurs on a Continuous Access Journal primary or secondary data volume, the primary
storage system will suspend the data volume pair (SIM reference code = D41x, D42x, DB1x, or 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.
2. Release the data volume pair that contains the volume with the pinned track (see
“Releasing a Pair of Data Volumes (Pairsplit-S)” on page 138).
3. If the volume is offline (for example, secondar y data volume has 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 service representative for
assistance in recovering the pinned track.
5. If thevolumewas previously offline (for example, secondary data volume. See step 3,makesure
to
vary the volume offline again.
6. Use the Paircreate comm and in the Pair Operation window (see
“Creating a Pair of Data Volumes (Paircreate)” on page 128) to recover the data volume pair.
Make sure to select the Entire initial copy option in the Paircreate window.
Recover
ingaPinnedTrack on aDataVolume
If a pinn
ed
track occurs on a Continuous Access Journal master or restore journal volume, the p rocedure
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 (see
“Split
ting a
Mirror (Pairsplit-r: Suspending a Copy Operation)”onpage122).
2. Delete
the
journal volume c ontaining the pinned track from the journal group (see
“Dele
ting
Journal Volumes from a Journal Group” on page 115).
3. Forma
t
the journal volume by using the LDEV format function of VLL. For detailed instructions on
how t
o
format the volume, see HP StorageWorks XP24000 Virtual LVI/LUN (VLL) and Volume
Shredder User's G uide.
4. Register the formatted volume (o r another volume that can be used instead of the formatted
volu
me) in the journal group (see “Registering Journal Volumes in a Journal Group” on page 111).
• Ifyou do notneedtoresumecopying,the procedureis now finished.
• To resume copying, continue to restore the mirror to which the journal group belongs (see
“Re
storing a Mirror (Pairresync: Resuming a Copy Operation)” on page 123).
140
Performing Continuous Access Journal Pair Operations