Faults Detected by the Sun Cluster HA for SAP liveCache Fault Monitors

Faults that each Sun Cluster HA for SAP liveCache fault monitor detects are described in the subsections that follow.

Faults Detected by the SAP liveCache Fault Monitor

The SAP liveCache fault monitor detects the following faults in SAP liveCache:

• Unexpected termination of liveCache

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  Note –

  The liveCache fault monitor also detects the expected termination of liveCache, which is not a fault. For more information, see Monitoring the Termination of liveCache by a User.

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• Unexpected termination of the liveCache parent process

• System failures

SAP liveCache can be stopped or restarted only if SAP xserver is available. Therefore, the SAP liveCache fault monitor also detects the unavailability of SAP xserver. This fault monitoring supplements the fault monitoring that the SAP xserver fault monitor provides. This additional fault monitoring enforces the cross-resource group resource dependency between SAP xserver and SAP liveCache.

Faults Detected by the SAP xserver Fault Monitor

The SAP xserver fault monitor detects following faults:

• Unavailability of SAP xserver. Unavailability of SAP xserver is also detected by the SAP liveCache fault monitor.

• System errors. The SAP xserver fault monitor treats a system error as a partial failure.

• Persistent system errors. A persistent system error is a system error that occurs four times within the retry interval. If a persistent system error occurs, the fault monitor restarts SAP xserver.

Recovery Actions in Response to Detected Faults

To minimize the disruption that transient faults in a resource cause, a fault monitor restarts the resource in response to such faults. For persistent faults, more disruptive action than restarting the resource is required:

• For the SAP liveCache resource, the fault monitor fails over the resource to another node. The SAP liveCache resource is a failover resource.

• For the SAP xserver resource, the fault monitor takes the resource offline. The SAP xserver is a scalable resource.