[clue] troubleshooting nfs mounts?

[Jim Ockers]

Hi Mike,

What does it mean "behind a 1GB router" ?  Please describe the network 
topology in more detail.  Is the NAS in a different subnet than the 
client?  What kind of router is it?

What is the bandwidth utilization on the switch ports for the client & 
server?  Any errors reported in the switch event log?  Any errors 
reported in the router event log?  What is the CPU load/usage on this 
"1GB router"?

When you un-tar the tarball from the NAS, what are you writing the 
result to?  Can you try writing it to /dev/null and see if it's any 
faster?  It would be faster if the problem was slowness in the 
filesystem/device that you were writing the un-tarred files to.

Jim

--
Jim Ockers, P.E., P.Eng. (ockers at ockers.net)
Contact info: http://www.ockers.net/

On 5/3/13 1:40 PM, Mike Bean 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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