HP XP Cluster Extension Software Administrator Guide

the HORCM file. If you do this, restart the HORCM manager instance and reconfigure the XP
Cluster Extension resource.
• Do not use HORCM commands to change the device/copy group property for a device/copy
group that is configured for a XP Cluster Extension resource. If you do this, the changed
property is not reflected immediately in the Parameters tab. To work around this situation,
re-select the device/copy group from the XP device/copy group menu in the Parameters tab.
Configuring server data center assignments
To configure server data center assignments from the Failover Cluster Management Parameters
tab or the resource configuration tool:
1. To remove a data center assignment, select the assignment, and then click Remove.
2. To modify a data center assignment, select the assignment, and then click Modify. Enter the
new Data center name in the Modify Node in Data Center List window, and then click OK.
3. To add a data center assignment, click Add. Select a host and a data center, and then click
OK.
4. Click OK to save your changes and close the window.
Changing failover and failback behavior
To configure failover and failback behavior from the Failover Cluster Management Parameters tab
or the resource configuration tool:
1. Click Failover/Failback to display the Failover/Failback window.
2. Update the ApplicationStartup and AutoRecover values as needed, and then click OK.
3. Click OK to save your changes and close the Properties window or Resource Configuration
tool.
Activating the pair/resync monitor
The pair/resync monitor detects and responds to suspended Continuous Access links if the
ResyncMonitor object is set to YES. If the ResyncMonitorAutoRecover object is set to YES, automatic
disk pair resynchronization is also activated.
When the resource is taken offline, the monitor is stopped for the RAID Manager device/copy
group used for this resource.
CAUTION:
If a resource cannot be taken offline manually, and goes into a failed state, the cluster administrator
must disable monitoring of the device/copy group for this resource. To avoid data corruption, this
task must be part of the recovery procedure when XP Cluster Extension is deployed in an MSFC
environment. See “Stopping the pair/resync monitor” (page 42).
You must ensure that the pair/resync monitor does not monitor and resynchronize the disk pair
(device/copy group) from both disk array sites.
To activate the pair/resync monitor from the Failover Cluster Management Parameters tab or the
resource configuration tool:
26 Configuring XP Cluster Extension