If you use the rw, rw=, ro, or ro= options to the share -o command, NFS fault monitoring works best if you grant access to all the physical hosts or netgroups that are associated with all the Oracle Solaris Cluster servers.
If you use netgroups in the sharecommand, add all the Oracle Solaris Cluster hostnames to the appropriate netgroup. Ideally, grant both read access and write access to all the Oracle Solaris Cluster hostnames to enable the NFS fault probes to do a complete job.
You can also modify the shared path and options dynamically without bringing offline the HA for NFS resource. See How to Dynamically Update Shared Paths on an NFS File System.
To modify the share options on an NFS file system while the HA for NFS resource is offline, perform the following steps.
# clresource unmonitor resource
# share -F nfs [-o specific_options] [-d "description"] pathname
Identifies the file system type as NFS.
Specifies an option. You might use rw, which grants read-write access to all the clients.
Describes the file system to add.
Identifies the file system to share.
When the new command executes successfully, proceed to Step 4.
# unshare -F nfs [-o specific_options] pathname
Identifies the file system type as NFS.
Specifies the options that are specific to NFS file systems.
Identifies the file system that is made unavailable.
# vi dfstab.resource
# clresource monitor resource