When you migrate the master role manually, you must specify the node that you want to take over the master role. You can view the preference values set on the node to help you determine the best node to take over the master role.

When you change the master node manually, the cluster stays online, and none of the nodes are required to leave the cluster. However, Cluster Volume Manager (CVM) quiesces the application I/Os. Therefore, schedule the master switch operation at an appropriate time to minimize the effect on performance.

After a master failover, if you decide that CVM selected an inappropriate node to be the master, you can change the master role manually. In this case, you may also want to change the customized failover preference values for the cluster nodes.

See About setting cluster node preferences for master failover.