HP UX Serviceguard Storage Management Software manual Cluster File System Administration

Cluster File System Administration

Cluster File System Administration

IMPORTANT

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

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-UXmount 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

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