04-27-2011
Very Active NFS and Disk Usage
Here is the scenario...
NFS share that is accessed every few minutes by approx 70 systems (AIX 5.3/6.1). Filesystem space is being eaten up rapidly according to df however du numbers really never change. lsof and fuser cannot see any unlinked files on either the NFS server or remote clients. Restarting nfsd does not resolve the issue. However, attempting to umount the underlying JFS2 filesystem fails (device busy) obviously but magically frees up the "used" disk space...
Any thoughts on this?
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LEARN ABOUT SUSE
umount.nfs
UMOUNT.NFS(8) System Manager's Manual UMOUNT.NFS(8)
NAME
umount.nfs, umount.nfs4 - unmount a Network File System
SYNOPSIS
umount.nfs dir [-fvnrlh ]
DESCRIPTION
umount.nfs and umount.nfs4 are a part of nfs(5) utilities package, which provides NFS client functionality.
umount.nfs4 and umount.nfs are meant to be used by the umount(8) command for unmounting NFS shares. This subcommand, however, can also be
used as a standalone command with limited functionality.
dir is the directory on which the file system is mounted.
OPTIONS
-f Force unmount the file system in case of unreachable NFS system.
-v Be verbose.
-n Do not update /etc/mtab. By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip delet-
ing an entry.
-r In case unmounting fails, try to mount read-only.
-l Lazy unmount. Detach the file system from the file system hierarchy now, and cleanup all references to the file system as soon as it
is not busy anymore.
-h Print help message.
NOTE
For further information please refer nfs(5) and umount(8) manual pages.
FILES
/etc/fstab file system table
/etc/mtab table of mounted file systems
SEE ALSO
nfs(5), umount(8),
AUTHOR
Amit Gud <agud@redhat.com>
6 Jun 2006 UMOUNT.NFS(8)