You can force a version in the mount command. Mount -t nfs4 will use v4 and fail if if only v3 is available. <div class="gmail_quote">On Aug 26, 2011 6:14 PM, "Roland Roberts" <<a href="mailto:roland@astrofoto.org">roland@astrofoto.org</a>> wrote: > On 08/26/2011 05:41 PM, Robert Arkiletian wrote: >> On Fri, Aug 26, 2011 at 2:09 PM, Jim Kinney<<a href="mailto:jim.kinney@gmail.com">jim.kinney@gmail.com</a>> wrote: >>> Tuning NFS is an art form. First make sure to use v4. The block sizes need >>> tweaks to max throughputs. There may also need to be a kernel param tweaked >>> but I'm not near my notes. >>> >> Are you sure? The advice I see is to use v3. I have been using v3 in >> F11 and F13 with no problems. I haven't used v4 yet though. > > I think 4 is the default on F14 and EL6.x. I see it reported as > available in rpcinfo -s. I was trying to see if there was some magic to > force a version or prevent certain versions from running on the server > to be sure of what's being used, but I can't find it. According to the > docs, the version is negotiated starting at 4 and working down. > >> Here is a nice page about nfs optimizations. >> <a href="http://nfs.sourceforge.net/nfs-howto/ar01s05.html">http://nfs.sourceforge.net/nfs-howto/ar01s05.html</a> > > I was staring at it even as your message arrived :-) >> also use no_subtree_check in /etc/exports > > I did add this earlier today and looked to see what cruft I might have > in my auto.home map. I keep bouncing the daemon on another exported > filesystem so I can test. be happy with factor of 2 difference between > local and nfs, but that factor of 6 is hurting. > > I'll try a few things and report back. > > roland > > -- > PGP Key ID: 66 BC 3B CD > Roland B. Roberts, PhD RL Enterprises > <a href="mailto:roland@rlenter.com">roland@rlenter.com</a> 6818 Madeline Court > <a href="mailto:roland@astrofoto.org">roland@astrofoto.org</a> Brooklyn, NY 11220 > > _______________________________________________ > K12OSN mailing list > <a href="mailto:K12OSN@redhat.com">K12OSN@redhat.com</a> > <a href="https://www.redhat.com/mailman/listinfo/k12osn">https://www.redhat.com/mailman/listinfo/k12osn</a> > For more info see <<a href="http://www.k12os.org">http://www.k12os.org</a>> </div>