NFS Performance Woes

[Peter Skensved]

> 
> 
> On 07/21/14 19:59, Ian Chapman wrote:
> > Nfsstat, wireshark and the system logs do not show anything which screams there's a problem.
> >
> > The network card in the client machine and the server shows no collisions, dropped packets, frame overruns etc.
> >
> > I've tested with the export that isn't using Kerberos and still have the 
> > same issue. Messing with the rsize, wsize, async, sync parameters makes no difference either.
> >
> > The server has 32GB RAM, the client 16GB.
> >
> > For all intents and purpose it looks like its working as it should, it's just painfully slow.
> >
> > Any NFS gurus out there, that can tell me what I'm doing wrong? 
> 
> I've been using NFSv4 extensively for several years and I've not had an issue that you
> describe where everything is fine and then suddenly performance goes to hell in a hand basket. 
> 
> It sounds as if you only have 2 systems to work with?  No, tiebreaker so to speak?
> 
> Have you considered running a VM on your client system to see if it is affected in the same way?
> 


  DNS problems can do it . Are your /etc/resolv.conf files correct ?
You could try running your own nameserver ( dnsmasq ) if the upstream
one is too slow or too busy.

                                        peter