NFS Services Administrator's Guide

Configuring and Administering NFS Services
Configuring and Administering an NFS Server
Chapter 250
NOTE The exportfs command, used to export directories in versions prior to
HP-UX 11i v3, is now a script that calls the share command. HP
provides a new exportfs script for backward compatibility to enable
you to continue using exportfs with the functionality supported in
earlier versions of HP-UX. To use any of the new features provided in
HP-UX 11i v3 you must use the share command. In HP-UX 11i v3, the
/etc/dfs/dfstab file replaces the /etc/exports file and the
/etc/dfs/sharetab file replaces the /etc/xtab file.
You can share a filesystem in the following methods:
• Automatic sharing
Filesystems configured in the /etc/dfs/dfstab file are shared
automatically during system reboot. To set up a directory for
automatic sharing, you must configure it in the /etc/dfs/dfstab
file.
• Manual sharing
Filesystems can also be shared manually. However, if the system is
restarted or rebooted, the filesystems will no longer be shared and
must be re-shared before it can be accessed by NFS clients. To share
directories manually, you must run the share command.
• Sharing using scripts
Sharing of filesystems using scripts, such as Serviceguard, is a
variant of manual sharing. Configure the filesystems that you share
across your Serviceguard clusters through scripts that are executed
under Serviceguard’s control. For more information on configuring
the filesystems for sharing using scripts, see Managing
Serviceguard, 12th Edition, March 2006.
Consider the following points before you share a directory:
• You cannot share a directory and its ancestor or descendant if they
are on the same disk or logical volume.
For example, if you share the root directory (/), you cannot share
/opt, unless / and /opt are on different disks or logical volumes.
Similarly, if you share /opt/frame, you cannot share /opt, unless
/opt/frame and /opt are on different disks or logical volumes.