Restarting exports disturbs NFS clients

[Rick Macklem]

Jeremy Chadwick wrote:
> 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.
> 
If the above doesn't work for you, the other alternative is to switch
from using mountd to nfse, which can be found on sourceforge.

rick

> --
> | 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 |
> _______________________________________________
> freebsd-fs at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-fs
> To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org"