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.
No. |
Status |
Failure |
Description |
---|---|---|---|
1 |
All statuses |
Abnormal process termination |
An ITSLM process terminated abnormally. |
2 |
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 |
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. |
The failures detected by the cluster software depend on cluster software specifications. For details, see the cluster software documentation.