HP EVA Cluster Extension Software Administrator Guide (5697-2445, July 2013)

ApplicationStartup (Optional)
Format String
Description Specifies where a cluster group should be brought online.
The ApplicationStartup object can be customized to determine whether an application
service starts locally or is transferred back to the remote data center (if possible) to
start immediately without waiting for resynchronization. This object is used only if
an application service has already been transferred to the secondary site and no
recovery procedure has been applied to the DR group (the DR group has not been
recovered and is not in a normal state). This process is considered a failback attempt
without prior DR group recovery.
EVA Cluster Extension can detect the most current copy of your data based on the
DR group information. If EVA Cluster Extension detects that the remote EVA storage
system has the most current data, it orders a resynchronization of the local disk from
the remote disk, or it stops the startup process to enable the cluster software to fail
back to the remote EVA storage system.
If a resynchronization is ordered, EVA Cluster Extension monitors the progress of
the copy process. If the application service was running on a secondary EVA storage
system without a replication link, a large number of records may need to be copied.
If the copy process takes longer than the configured application startup timeout
value, the application startup will fail.
MSCS
If the ApplicationStartup resource property is set to FASTFAILBACK, and the
FailoverThreshold value is set to a number higher than the current number of clustered
systems for the service or application, the service or application will restart on
configured nodes until one of the following conditions is met:
• The resource is brought online in the remote data center.
• The resource failed because the FailoverThreshold value has been reached.
• The resource failed because the FailoverPeriod timeout value has been reached.
CAUTION: Disable subsequent automated failover procedures for recovery failback
operations. If you want to use EVA Cluster Extension capabilities to recover a
suspended DR group state during a failover, make sure that subsequent failover
operations are disabled in case the recovery attempt fails. To disable subsequent
failover attempts, set the FailoverThreshold to zero (0) until the recovery operation
has finished successfully.
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
EVA 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.
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.
FASTFAILBACK is not available when the UseNonCurrentDataOkLinkUp property
is set to YES.
RESYNCWAIT
52 User configuration file and EVA Cluster Extension objects