[clue] troubleshooting nfs mounts?

[Chris Fedde]

First all the basics.  Are any of the interfaces counting errors?  Are the
interfaces properly configured to auto configure full duplex.  After that
start using the dd if=/dev/zero of=/path/on/nas and dd if=/path/on/nas
of=/dev/null to get a basic idea of the streaming performance.  Compare the
rates you see this way with the theoretical max.  Do similar things using
nc to characterize the network performance

The optimal throughput you can expect on a 1Gbit network interface is about
120Mbyte/sec.

After you have all that working and tuned properly get nagios or another
NMS running and start monitoring to get a feeling for what is normal and
what is exceptional.



On Fri, May 3, 2013 at 1:40 PM, Mike Bean <beandaemon at gmail.com> wrote:

> Peculiar problem, haven't the slightest idea where to start.  Need advice!
>
> RHEL5.4 box with an NFS mount point to a NAS storage device into a NAS
> device with jumbo frames disabled.  NAS has a samba share capability.
>
> Users are convinced it's too slow.
> At least one user is convinced that if he uses smbclient to untar the same
> tarball, it takes, 2 maybe 3 minutes.
> (My manual untar attempt of the same tarball has been running for 25
> minutes and climbing.)
>
> NAS is in a one-volume raid 6 - seven drives.  Users not showing much
> interest in splitting it into multiple volumes.
>
> Network guys are convinced the slowness is because it's behind a 1GB
> router;
> Not seeing anything that really worries me in /var/log/messages
> Not seeing any unusual processes in top
> memory use isn't excessive - not swapping
>
> network mtu is at 1500 - wouldn't matter, since our switch ports are at
> 1500 anyway,
>
> My own search attempts coming up dry.   Just vaguely related academic
> material that doesn't even give me a good idea where to start!
>
> I approach the oracle!
>
> Mike
>
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