Recovering a pinned track, Recovering a pinned track on a data volume – HP StorageWorks XP Remote Web Console Software User Manual
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NOTE:
If you select pairs with Duplex status and other than Duplex status in the same
mirror, an unexpected suspension may occur during the pair operations (Suspend Pair,
Delete(release) Pair, and Resume Pair) under heavy I/O load conditions. You can estimate
whether the I/O load is heavy or not from the frequency of host I/Os. The pair operations
should be performed under light I/O load conditions.
◦
Group: All pairs in the same mirror(s) as the selected pair(s) will be released.
CAUTION:
Do not use this option when releasing pairs at the secondary storage system
during a disaster recovery.
If the following two conditions are satisfied and you click Apply, a warning message will be
displayed and processing cannot be continued:
◦
The Preview list contains two or more pairs belonging to the same mirror.
◦
The Range column displays Group for at least one of the above pairs.
To continue processing, do either of the following:
◦
Ensure that the Range column displays Volume for all pairs in the same mirror.
◦
In the Preview list, select all but one pair in the same mirror, right click the selected pairs,
and then select Delete.
•
Delete Mode: Allows you to specify whether to release the pair(s) forcibly. When the status of
the pair(s) to be released is Simplex or Deleting, the default setting is Force. Otherwise, the
default setting is Normal.
◦
Force: The pair(s) will be forcibly released even if the primary storage system is unable
to communicate with the secondary storage system. This option may be used to free a
host 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 Simplex, Range will be set to Group.
NOTE:
When you delete a pair forcibly by specifying Volume for Range, other pairs
in the same journal group as the specified pair will be suspended by a failure.
◦
Normal: The pair(s) will be released only if the primary storage system is able to change
the pair status of the primary and secondary data volumes to Simplex.
•
Set: Applies the settings to the Preview list in the Pair Operation window (
).
•
Cancel: Discards the settings.
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 a pinned track.
Recovering a Pinned Track on a Data Volume
If a pinned track occurs on a Universal Replicator for Mainframe 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.
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Performing Pair Operations