Date: Fri, 3 May 2013 19:27:23 -0400 (EDT) From: Daniel Feenberg <feenberg@nber.org> To: freebsd-net@freebsd.org Subject: Restarting exports disturbs clients Message-ID: <Pine.GSO.4.64.1305031923490.1047@nber6>
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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 there is an NFS shutdown procedure that we should be using? Daniel Feenberg NBER
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