The fsclustadm command reports various attributes of a cluster file system. Using fsclustadm you can show and set the primary node in a cluster, translate node IDs to host names and vice versa, list all nodes that currently have a cluster mount of the specified file system mount point, and determine whether a mount is a local or a cluster mount. The fsclustadm command operates from any node in a cluster on which the file system is mounted, and can control the location of the primary node for a specified mount point.

See the fsclustadm(1M) manual page.