Administrator's Guide

Cluster File System Administration
Cluster File System Overview
Chapter 3
33
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.
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.
Table 3-1 Primary and Secondary Mount Options
Secondary:
ro
Secondary:
rw
Secondary:
ro, crw
Primary:
ro
X
Primary:
rw
XX
Primary:
ro, crw
XX