<div dir="ltr">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<div>
<br></div><div style>The optimal throughput you can expect on a 1Gbit network interface is about 120Mbyte/sec. </div><div style><br></div><div style>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.</div>
<div style><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, May 3, 2013 at 1:40 PM, Mike Bean <span dir="ltr"><<a href="mailto:beandaemon@gmail.com" target="_blank">beandaemon@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Peculiar problem, haven't the slightest idea where to start. Need advice!<div><br></div><div>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.</div>
<div><br></div><div>Users are convinced it's too slow.</div><div>At least one user is convinced that if he uses smbclient to untar the same tarball, it takes, 2 maybe 3 minutes.</div><div>(My manual untar attempt of the same tarball has been running for 25 minutes and climbing.)</div>
<div><br></div><div>NAS is in a one-volume raid 6 - seven drives. Users not showing much interest in splitting it into multiple volumes.</div><div><br></div><div>Network guys are convinced the slowness is because it's behind a 1GB router;</div>
<div>Not seeing anything that really worries me in /var/log/messages</div><div>Not seeing any unusual processes in top</div><div>memory use isn't excessive - not swapping</div><div><br></div><div>
network mtu is at 1500 - wouldn't matter, since our switch ports are at 1500 anyway,</div><div><br></div><div>My own search attempts coming up dry. Just vaguely related academic material that doesn't even give me a good idea where to start!</div>
<div><br></div><div>I approach the oracle!</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>Mike</div></font></span></div>
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