NFS Services Administrator's Guide (B.11.31.02) January 2008

NOTE: For specific configuration information, see “Secure NFS Setup with Kerberos” (page 29).
Changing the Default Mount Options
To change the default mount options, follow these steps:
1. Modify the NFS mount options in the /etc/fstab file, or the AutoFS map, as needed. For
more information on the different mount options that NFS supports, see mount_nfs(1M).
If you changed the mount options for a directory that is currently mounted, you must
unmount and remount it before the changes take effect. To unmount and remount the
directory, enter the following commands:
/usr/sbin/umount local_directory
/usr/sbin/mount local_directory
2. If you change the mount options in the AutoFS master map, you must restart AutoFS for
the changes to take effect. For information on restarting AutoFS, see “Restarting AutoFS”
(page 81).
For more information on the different caching mount options, see mount_nfs(1M).
Unmounting (Removing) a Mounted Directory
You can temporarily unmount a directory using the umount command. If you want to stop a
directory from being automatically mounted upon server restart or system reboot, remove it
from the /etc/fstab file.
NOTE: Before you unmount a directory, run the fuser -cu command to determine whether
the directory is currently in use. The fuser command lists the process IDs and user names of
all the processes who are using the mounted directory. If users are accessing the mounted
directories, they must exit the directories before you unmount the directory.
To unmount a mounted directory and prevent it from being automatically mounted, follow these
steps:
Automatic Unmount
1. To check for any processes accessing the mounted directory, enter the following command:
fuser -cu mounted_directory
2. To kill the processes, enter the following command:
fuser -ck local_mount_point
3. Unmount the filesystem as follows:
/usr/sbin/umount mounted_directory
4. If the unmount fails, use the forcible option to unmount the filesystem:
/usr/sbin/umount -f mounted_directory
5. Verify whether all the directories are unmounted by entering the following command:
mount
The directories that you have unmounted must not be present in the list displayed.
6. If you do not want the directory to be automatically mounted when the system is rebooted,
remove the directory entry from the /etc/fstab file.
Disabling NFS Client Capability
To disable the NFS client, follow these steps:
44 Configuring and Administering NFS Services