You may way to try UDP instead of TCP.<br>&nbsp;and/or reduce the rsize/wsize to 8k or 1k to see if it makes a difference.<br>If it does, then keep increasing it (1K, 2K, 4K, 8K, 16K) until it is no longer useful then drop it back one.
<br>The retrans and timeo options may also be useful as well.<br><br>Also, if you stay with TCP, you may want to investigate changing the TCP window size on the NFS client.<br><br><br><div><span class="gmail_quote">On 6/7/07, 
<b class="gmail_sendername">Carl Howell</b> &lt;<a href="mailto:chowell@uwf.edu">chowell@uwf.edu</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">









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<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">Yes. NFS. Mount options: rw,bg,hard,intr,vers=3,proto=tcp,rsize=32768,wsize=32768.</span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">&nbsp;</span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">I'm not sure you would call it a WAN. I believe the
correct acronym is LFN or Long Fat Network(right?). We have VLAN's that
we ride over the Florida LamdaRail to our colo. The RTT is around 13-14ms.</span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">&nbsp;</span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">I know there are appliances out there that can solve this
problem, but these backups won't be done this way for much longer, and I
just wanted to see if I could get the math right. </span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">&nbsp;</span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">For our filers, I did adjust the option snapmirror.window_size
to 1750000 (1Gb * .014/8), and that is working fine. </span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">&nbsp;</span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">--Carl</span></p>

<p><span style="font-size: 11pt; color: rgb(31, 73, 125);">&nbsp;</span></p>

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<p><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> tmac
[mailto:<a href="mailto:tmacmd@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">tmacmd@gmail.com</a>] <br>
<b>Sent:</b> Thursday, June 07, 2007 8:29 AM<span class="q"><br>
<b>To:</b> Carl Howell<br>
<b>Cc:</b> <a href="mailto:toasters@mathworks.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">toasters@mathworks.com</a><br>
<b>Subject:</b> Re: NFS backups over 1Gb WAN</span></span></p>

</div><span class="q">

<p>&nbsp;</p>

<p style="margin-bottom: 12pt;">Are you using NFS over the WAN?<br>
If so, what are your mount options?<br>
<br>
If not, then are you using SnapVaul/SnapMirror over the WAN or something else?<br>
<br>
<br>
</p>

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<p><span>On 6/7/07, <b>Carl Howell</b> &lt;<a href="mailto:chowell@uwf.edu" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">chowell@uwf.edu</a>&gt; wrote:</span></p>

<p style="margin-bottom: 12pt;">9000. And to be clear, these
are backups that are going to the R200. <br>
<br>
--Carl<br>
<br>
-----Original Message-----<br>
From: Tom Samplonius [mailto:<a href="mailto:tom@samplonius.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">tom@samplonius.org</a>]<br>
Sent: Wednesday, June 06, 2007 7:53 PM<br>
To: Carl Howell<br>
Cc: <a href="mailto:toasters@mathworks.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">toasters@mathworks.com</a><br>
Subject: Re: NFS backups over 1Gb WAN<br>
<br>
<br>
&nbsp;&nbsp;What is the MTU size on your WAN link?<br>
<br>
<br>
<br>
----- &quot;Carl Howell&quot; &lt;<a href="mailto:chowell@uwf.edu" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">chowell@uwf.edu</a>
&gt; wrote:<br>
&gt; What would be the optimal NFS settings for a filer on a 1Gb network<br>
&gt; with a 14ms rtt? We have moved our R200 to a remote DC and have seen<br>
&gt; NFS performance plummet. The NFS traffic is all backups. <br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; Thanks,<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; -Carl</p>

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<p><br>
<br clear="all">
<br>
-- <br>
--tmac<br>
<br>
RedHat Certified Engineer&nbsp; </p>

</span></div>

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</blockquote></div><br><br clear="all"><br>-- <br>--tmac<br><br>RedHat Certified Engineer&nbsp;