5.3.3 Cluster operation with the health check function

The health check function runs on a physical host or logical host and monitors the processes running on each host. By using this function, process halts and hangups can be identified as errors and a failover initiated.

To initiate a failover when the health check function detects a process error, enable failover in the health check setup file. For details on the forwarding settings file, see Forwarding settings file in 16. Definition Files.

The following figure shows a configuration example using the health check function in a clustering environment.

Figure 5‒6: Configuration example using the health check function in a clustering environment

In this example, the health check function is used on the physical hosts (primary and secondary servers) and on the logical host. If the health-check function detects an abnormal process on a logical host when monitoring the local host, in Windows, the JP1/Base service will stop; and in UNIX, the health check process (jbshcd) will stop. If the system detects such a stop, the system will try to initiate a failover by using the cluster software.

Note

The monitoring status at the target host is reset when a failover occurs at detection of an error during remote host monitoring. If the failed remote host has not been restored when next polled, the health check function issues an error message or JP1 event again. If the failed remote host has been restored, no recovery message or JP1 event is issued.

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