6.1.3 Failover timing

Failover occurs at the following times:

When ITSLM detects a failure that results in failover
When the cluster software detects a failure that results in failover

The table below describes the failures that are detected by ITSLM as resulting in failover. When ITSLM detects such a failure, it terminates the Windows services and notifies the cluster software of the failure.

Table 6‒3: Failures detected by ITSLM as resulting in failover
No.	Status	Failure	Description
1	All statuses	Abnormal process termination	An ITSLM process terminated abnormally.
2	All statuses	Memory shortage	A memory shortage occurred in ITSLM. This results in the same status as 1 above because the corresponding process terminates abnormally.
3	Monitoring of services is underway	Communication error	A communication error occurred while ITSLM was monitoring services and all retry attempts failed. This results in the same status as 1 above because the source process terminates abnormally.
4	Monitoring of services is underway	Database access error^#	A database access error occurred while ITSLM was monitoring services and all retry attempts failed. This results in the same status as 1 above because the source process terminates abnormally.

#: Not applicable to ITSLM - UR.

The failures detected by the cluster software depend on cluster software specifications. For details, see the cluster software documentation.

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