Date: Sat, 4 May 2013 12:13:23 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: Daniel Feenberg <feenberg@nber.org> Cc: freebsd-fs@freebsd.org Subject: Re: Restarting exports disturbs NFS clients Message-ID: <20130504191323.GA71065@icarus.home.lan> In-Reply-To: <alpine.LRH.2.03.1305041434230.10477@nber.org> References: <alpine.LRH.2.03.1305041434230.10477@nber.org>
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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@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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