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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Over simplification of a very, very complex subject. It’s rather disingenuous to pretend that a 300KW “server room” is comparable to a 100MW IT load facility
(admittedly in 6 rooms). I’ve seen their cooling systems first hand and its outstanding with excellent levels of redundancies that you don’t find in other facilities. There is always a PUE hit on large scale colocation facilities which are designed economically
and to scale economically. Completely agree good design now substantially limits this (containment, free air cooling, some UPS technologies), but to pretend it is able to be all but completely avoided is not constructive in my opinion, particularly when you
talk about scale.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">1.24 PUE in the middle of the Nevada desert is an outstanding result particularly considering the high daytime temperatures, dust storms/particulate which
require the more traditional cooling techniques during these times. I would suggest this is at full capacity and not part load.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">[b]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Their UPS’s are actually providing protected power, not some efficient bypass technique which “kicks in” when there is a problem to.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> ausnog-bounces@lists.ausnog.net [mailto:ausnog-bounces@lists.ausnog.net]
<b>On Behalf Of </b>Tony de Francesco<br>
<b>Sent:</b> Wednesday, 4 January 2012 10:52 PM<br>
<b>To:</b> 'Mark Newton'<br>
<b>Cc:</b> ausnog@ausnog.net<br>
<b>Subject:</b> Re: [AusNOG] Data Suburb</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Poor PUE at part load is an excuse for poor design.</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">There is no theoretical reason why PUE should be much, if any, worse at part load compared to full load. It largely comes down to the choice of technologies and
how they are controlled.</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black"> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">A good case in point is a 300kW (peak capacity) data centre we are monitoring in Melbourne. It is less than 15% full and is still operating at a PUE of around
1.15 in winter and around 1.30 in summer. As the load increases we are expecting the PUE to stay about the same or maybe increase slightly.</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:navy"> </span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Kind Regards</span><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#0F2B5F"></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"; color:#0F2B5F"> </span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Tony de Francesco<br>
Technical Director</span><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:navy"></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">email:
<a href="mailto:tonyd@pue.com.au">tonyd@pue.com.au</a></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">mob: +61 (0) 457 701 179</span></p>
<p class="MsoNormal"><span style="font-size:8.0pt; font-family:"Arial","sans-serif"; color:black">.....................................................</span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"; color:navy"><img border="0" width="140" height="86" id="_x0000_i1025" src="cid:image001.jpg@01CCCB88.96FA0420"></span><span style="color:navy"> </span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">
<a href="mailto:ausnog-bounces@lists.ausnog.net">ausnog-bounces@lists.ausnog.net</a>
<a href="mailto:[mailto:ausnog-bounces@lists.ausnog.net]">[mailto:ausnog-bounces@lists.ausnog.net]</a>
<b>On Behalf Of </b>Mark Newton<br>
<b>Sent:</b> Wednesday, 4 January 2012 11:07 PM<br>
<b>To:</b> Phillip Grasso<br>
<b>Cc:</b> <a href="mailto:ausnog@ausnog.net">ausnog@ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] Data Suburb</span><span lang="EN-US"></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
On 04/01/2012, at 9:20 PM, Phillip Grasso <<a href="mailto:phillip.grasso@gmail.com">phillip.grasso@gmail.com</a>> wrote:</p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span class="apple-style-span"><span style="background:white">"</span></span><span class="apple-style-span"><b><span style="font-family:"Arial","sans-serif"; background:white">The world's highest density large
scale data centers are also the most efficient!"</span></b></span></p>
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<p class="MsoNormal">Quoted from their site; also said they are 1.24 PUE, which compared to ancient datacenters might be pretty efficient but I won't say they are the "most efficient". </p>
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<p class="MsoNormal">They aren't full yet. Efficiency always takes a hit when capacity is underutilized during the buildout phase, but improves rapidly when installed infrastructure starts to reach its designed "sweet spot."</p>
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<p class="MsoNormal">Give 'em another year then look again.</p>
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<p class="MsoNormal"> - mark</p>
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