<div dir="ltr">A rack of our equipment weighs about 2tonnes and runs at about 35kW. That's pretty much a car... and they last about 5 years... so it is very comparable to your 1996 gasoline car.</div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 22, 2016 at 10:29 AM, Mark Hahn <span dir="ltr"><<a href="mailto:hahn@mcmaster.ca" target="_blank">hahn@mcmaster.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
in stark contrast to the environmentally friendly-ness of super computers<br>
and clusters...<br>
</blockquote>
<br></span>
I assume this was sarcasm, but then I was trying to think about what, in a datacenter, is particularly "dirty". sheetmetal and wire<br>
are not inherently clean industries, but they're also well-established<br>
and well-regulated, which means that the destruction-per-unit is low.<br>
(steel for cases is presumably part-scrap like most sheetmetal;<br>
I imagine the recycle rate for copper is pretty high too. perhaps even<br>
for Al (disk drives).) there's a fair amount of plastic, to be sure,<br>
but again: since your cables will be used for 5-7 years, they're not in the same universe of dirtiness as consumer junk. PC boards are glass<br>
fiber and polymer, not that easy to dispose of, but not evil (like the encapsulating plastic in chips). silicon devices are pretty green as well,<br>
since although a big plant has a big footprint, that's amortized over billions of units.<br>
<br>
power seems the most reasonable environmental complaint,<br>
but our systems are certainly not wasteful of that, since it's the easiest thing to tweak. it's also a pretty linear<br>
function of demand, and it's also improving drastically<br>
(unlike the env footprint of copper or steel or plastic.)<br>
<br>
phew, glad I got that off my chest ;)<br>
I can go back to feeling guilty about my 1996 gasoline car...<br>
<br>
regards, mark hahn.<div class="HOEnZb"><div class="h5"><br>
_______________________________________________<br>
Beowulf mailing list, <a href="mailto:Beowulf@beowulf.org" target="_blank">Beowulf@beowulf.org</a> sponsored by Penguin Computing<br>
To change your subscription (digest mode or unsubscribe) visit <a href="http://www.beowulf.org/mailman/listinfo/beowulf" rel="noreferrer" target="_blank">http://www.beowulf.org/mailman/listinfo/beowulf</a><br>
</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Dr Stuart Midgley<br><a href="mailto:sdm900@sdm900.com" target="_blank">sdm900@sdm900.com</a></div>
</div>