Cluster manager

Changes in the state of the cluster are referred to as cluster events. On each node, the Cluster Manager monitors local hardware and software subsystems for these events, such as an application failure event.

In response to such events, the Cluster Manager runs one or more event scripts, such as a restart application script. Cluster Managers on all nodes exchange messages to coordinate any actions required in response to an event.

The Cluster Manager is a daemon that runs on each cluster node. The main task of the Cluster Manager is to respond to unplanned events, such as recovering from software and hardware failures, or user-initiated events, such as a joining node event. The RSCT subsystem informs the Cluster Manager about node and network-related events.

Cluster manager connection to other PowerHA® SystemMirror® daemons

The Cluster Manager gathers information relative to cluster state changes of nodes and interfaces. The Cluster Information Program (Clinfo) gets this information from the Cluster Manager and allows clients communicating with Clinfo to be aware of a cluster's state changes. This cluster state information is stored in the PowerHA SystemMirror Management Information Base (MIB).