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

Pair/resync monitor integration
The pair/resync monitor is used to detect and react to suspended XP Continuous Access links. It is
activated by setting the ResyncMonitor object to YES. Additionally, the automatic disk pair
resynchronization feature is activated if the ResyncMonitorAutoRecover object value is YES.
When the HACMP resource group is taken offline, disable the monitor for the XP RAID Manager
device group used for this resource group.
CAUTION:
If the resource group cannot be taken offline, disable monitoring of the device group for this HACMP
resource group. To avoid data corruption, this must be part of the recovery procedure when XP Cluster
Extension is deployed in the HACMP environment. See “Stopping the pair/resync monitor” on page 115.
Ensure that the pair/resync monitor does not monitor and resynchronize the disk pair (device group)
from both disk array sites.
To use the pair/resync monitor you must create a pre-event for the release_vg_fs event. If the
resource group is taken offline on a cluster system, the corresponding application/device group is
taken from the list of monitored device groups and the monitoring is disabled.
To adjust the event handling:
1. Create an additional Custom Cluster Event. See “Adding a Custom Cluster Event for pair/resync
monitor integration” on page 32.
2. Configure the new Custom Cluster Event as a pre-event for the standard event release_vg_fs.
See “Redefining the Custom Cluster Event as a pre-event of the standard HACMP
event” on page 33.
Adding a Custom Cluster Event for pair/resync monitor integration
1. Run SMIT (HACMP section):
#smitty hacmp
2. Select the following:
• Extended Configuration
• Extended Event Configuration
• Configure Pre/Post-Event Commands
• Add a Custom Cluster Event
Configuring XP Cluster Extension for AIX32