Restarting exports disturbs clients

[Bernt Hansson]

2013-05-03 12:49, Daniel Feenberg skrev:
>
> When we change the exportfs file on our FreeBSD 9.1 fileserver:
>
>    kill -HUP `cat /var/run/mountd.pid`

That seems a bit harsh, try /etc/rc.d/nfsd restart or
/etc/nfsserver restart.

> it kills the jobs on  clients that have files open on the fileserver.
> 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