Veritas Storage Foundation 5.0 Cluster File System Administration Guide Extracts for HP Serviceguard Storage Management Suite, Second Edition, May 2008

Cluster File System Administration

Chapter 3

Cluster File System Administration

This section describes some of the major aspects of cluster file system administration

and the ways that it differs from single-host VxFS administration.

Cluster File System Commands

The CFS commands are:

• cfscluster—cluster configuration command

• cfsmntadm—adds, deletes, modifies, and sets policy on cluster mounted file systems

• cfsdgadm—adds or deletes shared disk groups to/from a cluster configuration

• cfsmount/cfsumount—mounts/unmounts a cluster file system on a shared volume

IMPORTANT Once disk group and mount point multi-node packages are created with HP

Serviceguard, it is critical to use the CFS commands, including cfsdgadm, cfsmntadm,

cfsmount, and cfsumount. If the HP-UX mount and umount commands are used, serious

problems such as writing to the local file system, instead of the cluster file system, could

occur. You must not use the HP-UX mount command to provide or remove access

to a shared file system in a CFS environment (for example, mount -ocluster,

dbed_chkptmount, or sfrac_chkptmount). These non-CFS commands could cause

conflicts with subsequent CFS command operations on the file system or the

Serviceguard packages. Use of HP-UX mount commands will not create an appropriate

multi-node package, which means cluster packages will not be aware of file system

changes. Instead, use the CFS commands - cfsmount or cfsumount.

The fsclustadm and fsadm commands are useful for configuring cluster file systems.

• fsclustadm

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

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 for a

specified mount point.

See the fsclustadm(1M) manual page.

• fsadm

The fsadm command is designed to perform selected administration tasks on file

systems. It can be invoked from a primary or secondary node. These tasks may differ

between file system types. A special device file contains an unmounted file system. A

special file system could be a directory, if it provides online administration

capabilities. A directory must be the root of a mounted file system.

See the fsadm(1M) manual page.

• Running commands safely in a cluster environment