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"du and df do not match on NFS share"

Post #302519385 by masterpengu on Tuesday 3rd of May 2011 09:42:44 PM

There is some extravagant scripts running on all 70(ish) LPARs from that share which I think is likely somehow creating hidden unlinked files or a whack of cache as you suggest. I didn't write them so I am digging through and correcting potential culprits in hopes of stumbling upon the issue. Nothing jumps out at me but there is many lines of code to look through.
 

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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)

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