About cluster membership

The current members of the cluster are the systems that are actively participating in the cluster. It is critical for Cluster Server engine (HAD) to accurately determine current cluster membership in order to take corrective action on system failure and maintain overall cluster topology.

A change in cluster membership is one of the starting points of the logic to determine if HAD needs to perform any fault handling in the cluster.

There are two aspects to cluster membership, initial joining of the cluster and how membership is determined once the cluster is up and running.