From: =?iso-8859-1?Q?Peter_=C5strand?= <peter@cendio.se>
Subject: broken umount -f
Date: Fri, 27 Dec 2002 17:44:06 +0100 (CET)
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <Pine.LNX.4.44.0212271736030.4143-100000@maggie.lkpg.cendio.se>
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To: nfs@lists.sourceforge.net
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For as long as I remember, umount -f has been broken. I got a reminder of
this fact today when we took an older NFS server out of use. I had to
reboot almost all machines that had mounts from this server. Not nice.=20

Anyone knows why -f does not work? When I try, I get:

# umount -f /import/applix
Cannot MOUNTPROG RPC: RPC: Port mapper failure - RPC: Unable to receive
umount2: Device or resource busy
umount: /import/applix: device is busy

lsof and fuser hangs, as do "df" and "du". Really frustrating. It's not=20
even possible to cleanly reboot the system, since RedHats shutdown script=
s=20
wants to unmount NFS fs's.=20

I'm not exactly sure I understand what -f is supposed to do. Is it correc=
t
that it is supposed to unmount without contacting the NFS server? I assum=
e
that I still have to make sure no processes are using the FS? Would it be
possible to add a "-9" flag (or something like that) that kills off all
processes that uses the NFS fs automatically?

(I'm using all kinds of RedHat Linux versions, from 5.0 up to 7.3. From=20
what I can tell, this problems exists in all versions.)

--=20
Peter =C5strand                Telephone: +46-13-21 46 00
Cendio Systems               E-mail: peter@cendio.se
Teknikringen 3
583 30 Link=F6ping


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