[Linux-cluster] umount failed - device is busy

[Lon Hohberger]

On Mon, 2005-10-10 at 22:06 +0200, Herta Van den Eynde wrote:

> > Did you try enabling force unmount in the device/file system
> > configuration?
> > 
> > -- Lon
> 
> Thanks for the explanation, Lon.  Yes, the devices are configured for 
> "Force Unmount".
> With the device unmounted on all of the nfs clients I even tried to 
> 'umount -f' manually, but I got the same result.

Odd.  Well, "umount -f" actually doesn't do what most people think it
does.

The "force unmount" option looks for and kills any user-land process
holding a reference on the file system using "kill -9".

So, if you're getting EBUSY on unmount even though force-unmount is
working (confirmed by you looking at lsof/fuser), chances are good that
there's a kernel reference on the file system.

It could be something NFS related - try "service nfs stop" and see if
you can umount the file system.

-- Lon