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

Pair/resync monitor messages in
syslog/errorlog/messages/event log
Using the pair/resync monitor will cause a message in the system log file of your operating system
(for any non-PAIR state of the device group being monitored). Those messages might indicate the
following:
• The XP RAID Manager instance is not running or cannot be used to gather device group state in-
formation.
• The device group is not in the PAIR state.
This could be caused by XP Continuous Access Software link failures or manual manipulation of the
disk pair state.
TIP:
Recover the PAIR state immediately, because replication of your data is not possible.
Check monitored XP disk pairs by invoking the following command from the command line:
clxchkmon –n application_name –g device_group –show
TIP:
Disable application service failover for the time of the XP disk pair recovery (resynchronization). XP
Cluster Extension's logic is based on the assumption that if the monitor is enabled, immediate action
will be taken to recover a suspended XP disk pair.
Problem
Resource XYZ: XP Cluster Extension: device group XYZ is not in PAIR state.
This message appears even though the device group is in PAIR state.
Solution
If you are using the pair/resync monitor, the ResyncMonitorInterval must be less than or equal to the
resource monitor interval for the XP Cluster Extension resource to prevent erroneous logging.
The ResyncMonitorInterval in XP Cluster Extension defines when the pair/resync monitor checks the
actual device group state. This state will be valid and shown until the next update
(ResyncMonitorInterval) occurs. If the actual XP disk pair state changes between two
ResyncMonitorInterval(s), the PAIR state shown by the pair/resync monitor will not be correct.
The resource monitor checks the status of the XP Cluster Extension resource at the resource monitor
interval of the cluster software. The XP Cluster Extension resource reports the status of the device group
at that interval based on the current state in the pair/resync monitor.
If the ResyncMonitorInterval is set to a higher value than the resource monitor interval for the XP Cluster
Extension resource, the pair/resync monitor will update the device group state less often.
However, the XP Cluster Extension resource logs messages only if the device group is not in PAIR state
or if an XP RAID Manager error occurred (for example, if XP RAID Manager is not running).
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