Subject: /. The Space Simulator Cluster
hahn at physics.mcmaster.ca
Tue Nov 26 09:09:48 EST 2002
> lanl's web page says the per node price was under $1k. So with 294 nodes and
> a $500k total price, they've still got over $100k to spend on switches and
> wire racks.
the racks, of course, are dead cheap (costco, $100 or so).
> effective to me. A 1U or 2U rack case is just as dense as those shuttle
hmm, 1U is 19" x 1.75 = 214.5 sq cm of "rack surface area".
xpc is 20x28.5cm=370 sq cm
an "ultraslim" desktop from HP (eg) is 218 sq cm.
so yes, xpc's use somewhat larger space. that's hardly a bad thing, since
if you were really interested in density, you'd be using blades. airflow
might well be easier to manage with these.
the real question is: how reliable are they? if you figure that they have
two 50Khour fans in each unit (PS and CPU/heatpipe), they'll be replacing
a unit every 3.5 days. no doubt they'll have a pile of spares, but it's
still something of a pain.
> With a dual CPU board you could get by with half the number of Gb
> switch ports, which aren't cheap for >24 port switches.
true, but your linpack score would probably also go down...
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