[clug-talk] forcing umount on nfs filesystem [solved]

[Gustin Johnson]

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I usually try to figure out what was locking the directory before
resorting to umount -f.  Try something like lsof |grep unix_data

Sometimes it is something as simple as having left a command prompt "in"
that directory, sometimes it is a process, such as apache.


smagnuson at forzani.com wrote:
> It figures, I have been playing with this on and off for a couple of days now.  Decide to engage the group and then discover the following works on linux clients.  Gonna try AIX now.
> 
> sudo umount -lf /unix_data
> 
>        -l     Lazy unmount. Detach the filesystem from the filesystem  hierar-
>               chy now, and cleanup all references to the filesystem as soon as
>               it is not busy anymore.  (Requires kernel 2.4.11 or later.)
> 
> 
> 
> -----Original Message-----
> From: clug-talk-bounces at clug.ca [mailto:clug-talk-bounces at clug.ca]On
> Behalf Of Magnuson, Sig
> Sent: Friday, October 14, 2005 9:31 AM
> To: clug-talk at clug.ca
> Subject: [clug-talk] forcing umount on nfs filesystem
> 
> 
> we have a linux nfs server serving linux and AIX clients.
> 
> When our linux nfs server recently went down we were left with stale NFS file handles on some of the hosts.  We have been unable to umount/remove the stale mount.  rebooting is not a option at this time.  
> 
> Any suggestions on how to remove this stale mount.
> 
> IE:
> 
> cat /etc/redhat-release
> Red Hat Enterprise Linux AS release 3 (Taroon Update 4)
> 
> sudo umount /unix_data
> umount: /unix_data: device is busy
> 
> sudo umount -f /unix_data
> umount2: Device or resource busy
> umount: /unix_data: device is busy
> 
> sudo umount -vf /unix_data
> umount2: Device or resource busy
> umount: /unix_data: device is busy
> 
> df -h
> Filesystem            Size  Used Avail Use% Mounted on
> ...
> ...
> calnfs01.corporate.net:/nfs_unix_data
>                          -     -     -   -  /unix_data
> 
> sudo lsof /unix_data
> lsof: WARNING: can't stat() nfs file system /unix_data
>       Output information may be incomplete.
> lsof: status error on /unix_data: Stale NFS file handle
> lsof 4.63
>  latest revision: ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/
>  latest FAQ: ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/FAQ
>  latest man page: ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/lsof_man
>  usage: [-?abhlnNoOPRstUvV] [-c c] [+|-d s] [+D D] [+|-f]
>  [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+|-M] [-o [o]] [-p s]
>  [+|-r [t]] [-S [t]] [-T [t]] [-u s] [+|-w] [--] [names]
> Use the ``-h'' option to get more help information.
> 
> sudo fuser /unix_data
> /unix_data: Stale NFS file handle
> 
> sudo fuser -k /unix_data
> /unix_data: Stale NFS file handle
> 
> attempts to remount over top of the stale mount result in dual entries
> sudo mount /unix_data
> df -h
> Filesystem            Size  Used Avail Use% Mounted on
> ...
> ...
> calnfs01.corporate.net:/nfs_unix_data
>                       100G   74M  100G   1% /unix_data
> calnfs01.corporate.net:/nfs_unix_data
>                       100G   74M  100G   1% /unix_data
> 
> sudo umount -f /unix_data
> df -k
> Filesystem           1K-blocks      Used Available Use% Mounted on
> ...
> ...
> calnfs01.corporate.net:/nfs_unix_data
>                              -         -         -   -  /unix_data
> 
> sudo umount -f /unix_data
> umount2: Device or resource busy
> umount: /unix_data: device is busy
> 
> 
> Anyone tried this suggestion?
> http://lists.debian.org/debian-isp/2003/04/msg00234.html
> 
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