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

Valid values FASTFAILBACK (default)
The cluster group is brought online in the remote data center (if possible) without
waiting for resynchronization. The application startup process is stopped locally
and XP Cluster Extension reports a data center error. Depending on the cluster
software, the application service cannot start on any system in the local data center,
and the cluster software transfers the application service back to the remote data
center. Use this value to provide the highest level of application service availability.
Depending on the value configured for the AutoRecover object, XP Cluster Extension
attempts to update the former primary disk based on the secondary disk and swaps
the personalities of the disk pair so that the local disk will become the primary disk.
In a two-node cluster, this process does not work because the target failback system
is not available. In this case, the application service must be started manually, or
the ApplicationStartup object must be set to RESYNCWAIT.
In an XP Cluster Extension for MSCS integration, XP Cluster Extension can detect
when there is no target failback system available in the remote data center. In this
case, XP Cluster Extension behaves as if the ApplicationStartup resource property
is set to RESYNCWAIT.
RESYNCWAIT
The online local cluster group must wait until the disk status is PAIR. XP Cluster Ex-
tension initiates a resynchronization of the local disk based on the remote disk.
The copy process is monitored; if no copy progress is made after a monitoring in-
terval expires, the copy process is considered failed and XP Cluster Extension returns
a global error. If RESYNCWAIT has been specified for the ApplicationStartup object,
the ResyncWaitTimeout object must be specified, in case XP Cluster Extension
should wait for resynchronization changes for more or less than 90 seconds, which
is the default.
AsyncTakeoverTimeout
Format Integer
Description (Optional) Specifies the horctakeover command timeout in seconds. Must be
adjusted based on disk mirroring link speed.
This object is used only if the FenceLevel object value is ASYNC.
The takeover operation for fence level ASYNC (XP Continuous Access Software)
offers the option to stop the data transfer process after a specified time value. This
is used to allow access to the remote copy if the data transfer process is stopped
due to an XP Continuous Access Software link failure. All data that has been copied
up to the moment the timeout value is reached is consistent and available to access
at the secondary site.
User configuration file and XP Cluster Extension objects130