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

• If the service group is offline, you can remove the XP Cluster Extension resource from the service
group.
To remove the resource, see “Deleting an XP Cluster Extension resource” on page 87.
Pair/resync monitor integration
The pair/resync monitor is used to detect and react to suspended XP Continuous Access Software
links. It is activated if the ResyncMonitor attribute value is set to YES. The automatic disk pair
resynchronization feature is also activated if the ResyncMonitorAutoRecover attribute value is YES.
When the resource is taken offline, the monitor is stopped for the XP RAID Manager device group
used for this resource.
The pair/resync monitor is not started if the ResyncMonitor attribute is changed to YES while the
resource is online. However, a running ResyncMonitor is disabled for the resource if the ResyncMonitor
attribute is changed to NO while the resource is online.
CAUTION:
If the resource group cannot be taken offline gracefully, the cluster administrator must disable
monitoring of the device group for this resource. To avoid data corruption, this task must be part of
the recovery procedure when XP Cluster Extension is deployed in the VCS environment. See “Stopping
the pair/resync monitor” on page 115.
VCS automatically attempts to stop the pair/resync monitor for the resource if it is running on more
than one system.
CAUTION:
Ensure that the pair/resync monitor does not monitor and resynchronize the disk pair (device group)
from both disk array sites.
Log-level reporting
The default setting for the pair/resync monitor's log facility is log level WARNING in the syslog. Solaris
does not log warning messages to syslog by default.
To receive messages from the pair/resync monitor in case of XP Continuous Access Software link
failures, add the following line to the /etc/syslog.conf file:
user.warning /var/adm/messages
This line ensures that you will be notified of XP Continuous Access Software link failures if you use the
pair/resync monitor.
Timing considerations for VCS
XP Cluster Extension gives priority to XP disk array operations over cluster software operations; if XP
Cluster Extension invokes disk pair resynchronization operations or gathers information about the
remote XP disk array, XP Cluster Extension waits until the requested status information is reported.
This feature prioritizes data integrity over the cluster software's failover behavior.
Configuring XP Cluster Extension for Solaris88