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Re: [K12OSN] SL 6.1 NFS client for FC 14, performance issues?



You can force a version in the mount command. Mount -t nfs4 will use v4 and fail if if only v3 is available.

On Aug 26, 2011 6:14 PM, "Roland Roberts" <roland astrofoto org> wrote:
> On 08/26/2011 05:41 PM, Robert Arkiletian wrote:
>> On Fri, Aug 26, 2011 at 2:09 PM, Jim Kinney<jim kinney gmail com> 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.
>> http://nfs.sourceforge.net/nfs-howto/ar01s05.html
>
> 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
>
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