[clue] troubleshooting nfs mounts?

[Mike Bean]

We're essentially trying to shove a 10GB of water through a 1GB pipe.  I
know.  It wasn't my idea. So far the only thing I'm trying to do is update
the firmware - but of course that's failing to.  I'll try your writing to
/dev/null idea.

Mike Bean



On Fri, May 3, 2013 at 1:53 PM, Jim Ockers <ockers at ockers.net> wrote:

>  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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