HP UX Serviceguard Storage Management Software manual Asymmetric Mounts

Cluster File System Administration

Cluster File System Overview

Asymmetric Mounts

Asymmetric mounts allow shared file systems to be mounted with different read/write capabilities. One node in the cluster can mount read-write, while other nodes mount read-only.

You can specify the cluster read-write (crw) option when you first mount the file system. The first column in the following table shows the mode in which the primary is mounted. The “X” marks indicate the modes available to secondary nodes in the cluster.

See the mount_vxfs(1M) manual page for more information.

Table 3-1	Primary and Secondary Mount Options
		Secondary:	Secondary:	Secondary:
		ro	rw	ro, crw
	Primary:	X
	ro
	Primary:		X	X
	rw
	Primary:		X	X
	ro, crw

Mounting the primary node with only the -o cluster,ro option prevents the secondary nodes from mounting in the read-write mode. Note that mounting the primary node with the rw option implies read-write capability throughout the cluster.

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