[svlug] When lsof/fuser fall short

Andrew Farley farley at couchsurfing.org
Thu Jan 28 14:54:35 PST 2010

Try -f and -l together.  I've had it necessary to use both on rare occasion.  If it won't interrupt with other mounts (and if we're talking about a NFS mount) you might consider killing lockd, or one of the RPC daemons associated with it.  I've had mild success with it, although when it locks up that hard sometimes even networking stops working and only a physical console or IPMI management is necessary.


Andrew Farley
CouchSurfing Systems Administrator
"making the world a smaller place..."

On Jan 28, 2010, at 1:19 PM, Tim Utschig wrote:

> On Thu, Jan 28, 2010 at 01:05:26PM -0800, Andrew Farley wrote:
>> Try lazy unmount, works well when a NFS server is no longer accessible.
>> http://lmgtfy.com/?q=lazy+unmount+busy+file+systems
> Sometimes even that doesn't work.  I don't know why, but it might
> be specific to the particular environment it failed me in (it
> hung, same with umount -f).  The environment consisted of RHEL3
> NFS clients with ClearCase (pesky proprietary mvfs/vnode kernel
> modules), and a Solaris 10 NFS server with a lockd that would
> quit responding once in a while.
> -- 
>   - Tim Utschig <tim at tetro.net>
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