Mark Hahn wrote:
in the cluster above, I choose a chassis (AIC) which has a large centrifugal
blower, rather than a bunch of 40mm axial/muffin fans. a much larger cluster
I'm working on now (768 nodes) has 14 40mm muffin fans in each node! while
I know I can rely on the vendor (HP) to replace failures promptly and without
complaint, there's an interesting side-effect: power dissipation. of 12 fans
pointing at the CPUs are actually paired inline, and each pair is rated to
dissipate up to 20W. so a node that idles at 210W and 265W under full load
can easily consume 340W if the fans are ramped up. ouch!
Heh... Load up a Sun v20z with a CPU pounding calculation, and as the
CPUs heat up, they wind the fans up. I had several parallel GAMESS runs
going and it reminded me of a turbo pump winding up .... Its neat to
probe the hardware status and see the fans wind up from 4-5000 RPM
through 12kRPM ...
--
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: [EMAIL PROTECTED]
web : http://www.scalableinformatics.com
phone: +1 734 786 8423
fax : +1 734 786 8452
cell : +1 734 612 4615
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