08-29-2005
You are doing the "umount" part correctly. The problem is (and this is indicated by the error message) that you can't umount a filesystem (on every UNIX, this is nothing special to AIX) as long as there is a process using a file in it or there is a user session with the PWD somewhere in the filesystem.
Therefore a "mount /myfs" followed by a "umount /myfs" will work, but if you do a "cd /myfs" in between it won't. Change your working directory to some other place and it will work again.
With "fuser" you can (this is why andryk gave you the hint) find out processes which use files in the FS.
As this is a beginners question you should ask it there and ask a moderator to move this thread there.
bakunin
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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)