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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>What
is viewed as the best practice (or what are people doing) on<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>something
like an SGI ICE system with multiple service or head nodes?<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>Does
one service node generally assume the same role as the<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>head
node above (serving NFS, logins, and running services like<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>PBS
pro)? Or ... if NFS is used, is it perhaps served from another<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>service node
and mounted both on the login node and the compute<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:black'>nodes?</span><span
style='font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Two service nodes which act as login/batch submission nodes.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>PBSpro configured to fail over between them (ie one is the PBS
primary server).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Separate server for storage – SGI connect these storage servers
via the Infiniband fabric,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>and use multiple Infiniband ports to spread the load – you can
easily configure this at cluster install time,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>ie. every nth node connects to a different Infiniband port on
the storage server.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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