HP XP Cluster Extension Software Administrator Guide

Figure 6 Disaster-tolerant configuration with rolling disaster protection
Monitoring and resynchronizing device/copy groups
The pair/resync monitor can either only monitor or both monitor and resynchronize the state of
the RAID Manager device/copy group for an application service.
CAUTION: If the application service stops, the cluster software or your customized solution must
be able to stop the monitoring or resynchronization utility. Without this ability, the use of the
pair/resync monitor is not supported. HP recommends that you disable application service failover
during a disk pair recovery (resynchronization). When the pair/resync monitor is enabled, XP
Cluster Extension takes immediate action to recover any reported suspended disk pair. If, at any
time, the resynchronization process is running on both disk array sites, data corruption might occur.
Turn the pair/resync monitor (clxchkd) on or off using the ResyncMonitor object. For information
on setting XP Cluster Extension objects, see “User configuration file and XP Cluster Extension
objects” (page 47).
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