HP StorageWorks XP Cluster Extension Software Administrator Guide (T1656-96035, April 2010)

CAUTION:
Measure or calculate the full XP disk array cache copy time to use
the gathered information for the AsyncTakeoverTimeout object. After
a takeover command has been invoked, XP Continuous Access
Software copies the side file area residing in the XP disk array cache
to the site where the takeover command has been issued (the
secondary disks). The side file area cannot exceed the installed cache
size. The maximum time for the AsyncTakeoverTimeout object is the
time to fully copy the amount of cache size data. The takeover timeout
value is used to terminate the copy process to provide access to the
secondary disks; for example, if all links or the primary XP disk array
are unavailable to copy the side file area. The copy time depends on
the performance of the XP Continuous Access Software link between
your sites. The takeover or resynchronization operation could take
longer than the timeout value for application service startup in the
cluster software. The application service startup might fail in this case.
However, the takeover or resynchronization command will continue
in the background.
Default value 3600
AutoRecover
Format String
Description (Optional) Recovers a suspended or deleted disk pair when the resource is brought
online at application service startup time.
If the AutoRecover object is set to YES, XP Cluster Extension will try to resynchronize
the remote disk at application startup time. XP Cluster Extension will ignore the return
code of the resynchronization command and allow access to the disk ensuring
highest application availability.
If the resynchronization attempt fails, XP Cluster Extension will not fail. The internal
logic will first apply the concurrency and consistency rules to allow access to the
disk set.
If you configure fence level DATA for the device group and set the FenceLevel object
to DATA, the AutoRecover object will change XP Cluster Extension's behavior. XP
Cluster Extension will attempt to re-establish the PAIR state and wait for the PAIR
state before it allows access to the disk. If the resynchronization or takeover process
fails, XP Cluster Extension returns a global error.
Valid values YES (default)
NO
BCEnabledA
Format String
Description (Optional) Enables rolling disaster protection for data center A.
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