Operation of the Fault Monitor for the SAP Web Application Server and SAP J2EE Engine Component Resource Type

To determine whether the SAP Web Application Server and the SAP J2EE Engine are operating correctly, the fault monitor for the SAP Web Application Server resource type probes these resources periodically.

The probe uses the SAP utility dpmon to check the health of the SAP Web Application Server and sends an XML/HTTP request to the SAP J2EE Engine.

# dpmon -info

-info

Specifies the dispatcher info that needs to be retrieved.

If this command is run on the command line, a return code is returned on the command line.

During a probe, the fault monitor determines whether both the SAP Web Application Serveris online by running the dpmon command with the -info option.

# dpmon -info

The result of this command determines the action of the probe, as follows:

1. If the command times out, the SAP Web Application Server issues a partial failure. If this time-out occurs one more time within the probe interval period, a failover occurs.

2. If the command does not time out, the probe checks the value of the return code from the dpmon command, as follows:

   • A return code value of 0 indicates that the command is successful, and no further action is taken until the next probe.

   • All other return codes are treated as a partial failure. If such a failure occurs three more times within the probe interval period, a failover occurs.

The fault monitor probe for the SAP J2EE Engine instance is not configurable.

Note that the values for the number of timeouts and the probe interval period are assigned by the SAP Web Application Server fault monitor. You cannot change these values.