Chapter 5. Cluster Customization
Within an HACMP for AIX cluster, there are several things that are customizable. The following paragraphs explain the customizing features for events, error notification, network modules and topology services.
5.1 Event Customization
An HACMP for AIX cluster environment acts upon a state change with a set of predefined cluster events (see 5.1.1, “Predefined Cluster Events” on page 117). Whenever a state change is detected by the cluster manager, it decides which event will be started. It then executes the script for that event in a shell, as well as the subevents associated with it. These predefined events can be found under /usr/sbin/cluster/events.
The HACMP for AIX software provides an event customization facility that allows you to tailor event processing to your site. This facility can be used to include the following types of customization:
•Adding, changing, and removing custom cluster events
•Pre- and
•Event notification
•Event recovery and retry
5.1.1Predefined Cluster Events
HACMP has the following predefined cluster events:
5.1.1.1 Node Events
This is the sequence of node_up events:
node_up | This event occurs when a node joins the cluster. |
| Depending on whether the node is local or |
| remote, this event initiates either a |
| node_up_local or node_up_remote event. |
node_up_local | This script acquires the service address (or |
| shared address), gets all its owned (or shared) |
| resources, and takes the resources. This |
| includes making disks available, varying on |
| volume groups, mounting file systems, exporting |
| file systems, |
| varying on concurrent access volumes groups. |
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