Restarting exports disturbs NFS clients
Jeremy Chadwick
jdc at koitsu.org
Sat May 4 19:13:26 UTC 2013
On Sat, May 04, 2013 at 03:08:43PM -0400, Daniel Feenberg wrote:
>
> When we change the exportfs file on our FreeBSD 9.1 fileserver and signal
> mountd to reread the file:
>
> kill -HUP `cat /var/run/mountd.pid`
>
> it kills the jobs on clients that have files open on the fileserver. They
> terminate with an I/O error. The same thing happens if NFS is restarted.
>
> This is pretty inconvenient for users (and us). Is there a way
> around this? We have noticed that a Linux fileserver can restart nfs
> without distrubing clients (other than a short pause). The Linux
> restart doesn't restart the locking mechanism - is that the
> difference? We could do without locks, even without NFSv4, for that
> matter, if it would let us change exports without disturbing users.
> Perhaps there is an NFS shutdown procedure that we should be using?
http://svnweb.freebsd.org/base/stable/9/usr.sbin/mountd/mountd.c?view=log
See commit r243739.
TL;DR -- Try running stable/9 instead of 9.1-RELEASE.
--
| Jeremy Chadwick jdc at koitsu.org |
| UNIX Systems Administrator http://jdc.koitsu.org/ |
| Mountain View, CA, US |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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