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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for the advice. That is what they
did as a temporary measure. But they don&#8217;t like the idea of static
entries in /etc/hosts. And I don&#8217;t see why the server needs to resolve the
same address over and over to the point of overloading the DNS.</span></font></p>

<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>&nbsp;</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Lippert, Kenneth B.
[mailto:Kenneth.Lippert@alcoa.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> </span></font><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>Monday,
 February 13, 2006</span></font><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> </span></font><font
 size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>11:54 AM</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>To:</span></b> Alexander Saydakov;
torqueusers@supercluster.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [torqueusers] too
many DNS requests</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>&nbsp;</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>As a first step, I would
make sure the server has it's own name in it's /etc/hosts file.&nbsp; I would
make sure each client also has the server in it's /etc/hosts.&nbsp; My cluster
is pretty small, so I go ahead and have all clients and the server listed in
all /etc/hosts - that way I never have to bother the DNS for intra-cluster
communications.</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>&nbsp;</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>Also check that
/etc/nsswitch.conf has &quot;files&quot; listed before &quot;dns&quot; under
&quot;hosts&quot; and &quot;networks&quot;, so the local /etc/host is read
before going to the DNS.</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>&nbsp;</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>-k</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>&nbsp;</span></font></p>

<div class=MsoNormal align=center style='margin-left:.5in;text-align:center'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>

<hr size=2 width="100%" align=center>

</span></font></div>

<p class=MsoNormal style='margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><b><font size=2 face=Tahoma><span style='font-size:10.0pt;font-family:
Tahoma;font-weight:bold'>From:</span></font></b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> torqueusers-bounces@supercluster.org
[mailto:torqueusers-bounces@supercluster.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Alexander Saydakov<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, February 13, 2006
2:35 PM<br>
<b><span style='font-weight:bold'>To:</span></b> torqueusers@supercluster.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [torqueusers] too many
DNS requests</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hi!</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>&nbsp;</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Currently we are playing with a
33-machine cluster, and our operations folks started to complain that
pbs_server overloads the DNS servers. They say that it repeatedly resolves its
own IP address. There is a pbs_mom running on that machine also, but since they
did not mention requests to resolve other cluster nodes, I suppose that
server&lt;-&gt;mom communication is not at fault. Could it be
server&lt;-&gt;scheduler communication or something else?</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Thanks.</span></font></p>

<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>&nbsp;</span></font></p>

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