On Monday 08 September 2008 13:01:08 patrick wrote:
Is there a way to kill an NFS connection to a server that's stopped
responding? When I try to simply unmount it, I get a never-ending
stream of server not responding messages. (Using FreeBSD 6.2, BTW.)
Thanks,
Patrick
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Another respondent already mentioned umount -f ... I wanted to clear up
something you may, or may not, know about NFS and that is that there isn't
really a connection. Unless the behaviour changed in FBSD 7, when mounting
NFS; UDP is used. UDP is a connectionless protocol in the IP suite of
protocols. Because of this, detecting a lost connection is rather
problematic. Usually, timeouts are used when sending new information, or
requesting something from the server.
I'd read through the mount_nfs(8) manual page just to be sure of options that
may help out in this case. The -c -t -D and some others looked rather
promising. In my experience, it's usually pretty difficult to unmount an
unresponsive NFS mount. In fact, *and only because of the environment in
which I was working*, I usually ended up rebooting my box. This is because I
didn't want to wait for the timeouts (painfully slow in some default
configurations; upwards of 10 minutes or more). This probably isn't feasible
if your system hosts services for other clients.
Andy
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