When a master node leaves, Cluster Volume Manager (CVM) fails over the master role to another node in the cluster. CVM selects the node in the cluster that is best suited to take over the master role. CVM gives preference to nodes that have connectivity to the maximum number of disks in the disk group. This behavior is an enhancement over previous releases of CVM.

During regular operations, CVM dynamically assigns an offset preference value to each node. The preference assignment is automatic, and generally does not require any intervention from the storage administrator. However, if you need greater control over the master selection, you can also set customized preference values. When a master failover occurs, CVM uses the custom node preferences together with the offset preference values to select the new master node.

To perform scheduled maintenance on a master node, you can manually migrate the master role to another node in the cluster.