IBM SG24-5131-00 Pre- and Post-Event Processing, Event Notification, Event Recovery and Retry

reconfig_resource_completeThis event indicates that a cluster resource dynamic reconfiguration has completed.

5.1.2 Pre- and Post-Event Processing

To tailor event processing to your environment, specify commands or user-defined scripts that should execute before and/or after a specific event is generated by the Cluster Manager. You specify them by selecting the HACMP event to be customized on the smit hacmp -> Cluster

Configuration -> Resources -> Cluster Events -> Change/Show Cluster

Events screen, and then, choosing the one to be tailored. Now, you can enter the location of your pre- or post-event to be executed before or after the chosen event has been processed.

For preprocessing, for example, you may want to send a message to specific users informing them to stand by while a certain event occurs. For post-processing, you may want to disable login for a specific group of users if a particular network fails.

5.1.3 Event Notification

You can specify a command or user-defined script that provides notification (for example, mail) that an event is about to happen and that an event has just occurred, along with the success or failure of the event.

This is done on the very same SMIT screen as in 5.1.2, “Pre- and Post-Event Processing” on page 122 in the Notify Command field.

For example, a site may want to use a network_down notification event to inform system administrators that traffic may have to be rerouted. Afterwards, you can use a network_up notification event to tell system administrators that traffic can again be serviced through the restored network.

Event notification in an HACMP cluster can also be done using pre- and post-event scripts, just by adding the script you want to execute for notification into the pre- and/or post-eventcommand script.

5.1.4 Event Recovery and Retry

You can specify a command that attempts to recover from an event command failure. If the retry count is greater than zero, and the recovery command succeeds, the event script command is rerun. You can also specify the number of times to attempt to execute the recovery command.

122 IBM Certification Study Guide AIX HACMP