Creating a point-in-time copy of data volumes, Recovering a pinned track – HP XP Continuous Access Software User Manual
Page 195
waiting for device-end from a primary storage system that cannot communicate with its
the secondary storage system, thus allowing host operations to continue.
If you specify Force when the pair status is other than SMPL, Range is set to Group.
◦
Normal: The pairs are released only if the primary storage system is able to change the
pair status of the primary and secondary data volumes to SMPL.
•
Set: Applies the settings to the Preview list in the Pair Operation window (
).
•
Cancel: Discards the settings and closes the window.
Creating a Point-in-Time Copy of Data Volumes
XP Continuous Access Journal enables you to make Point-in-Time (PiT) duplicates of groups of
volumes. The term PiT refers to an act of obtaining a copy of data immediately when you want to
obtain it. XP Continuous Access Journal can be used to create a PiT copy of data volumes belonging
to a journal group.
To produce a PiT duplicate of data volumes belonging to a journal group:
1.
Stop all write I/Os from hosts to primary data volumes in the journal group. Stop all host
updates to all XP Continuous Access Journal primary data volumes in the group.
2.
After all write I/Os to the primary data volume have stopped, split the mirror (that is, a pair
of the master and restore journal group; see
“Splitting a Mirror (Pairsplit-r: Suspending a Copy
). When splitting a pair, use the Pairsplit-r window, and then specify
Group for Range and specify Flush for Suspend Mode.
3.
When the status of all data volume pairs in the journal group has changed to PSUS, the
duplicate set of volumes is complete. If desired, you can restart your business application at
the primary site to resume business activities.
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 an XP Continuous Access Journal Data Volume
If a pinned track occurs on an XP Continuous Access Journal primary or secondary data volume,
the primary storage system suspends 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
a Pair of Data Volumes (Pairsplit-S)” (page 193)
).
3.
If the volume is offline (for example, secondary 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 the volume was previously offline for example, secondary data volume; see step
. Make
sure to vary the volume offline again.
6.
Use the Paircreate command in the Pair Operation window (see
Volumes (Paircreate)” (page 180)
) to recover the data volume pair. Make sure to select the
Entire initial copy option in the Paircreate dialog box.
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