[clue] troubleshooting nfs mounts?

[Mike Bean]

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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