[Beowulf] let's standardize liquid cooling
Lux, Jim (337C)
james.p.lux at jpl.nasa.gov
Fri Sep 28 14:25:57 PDT 2012
An interesting idea..
BUT.. you might need some sort of "bench test" fixture.. thermally driven convection might work.
And I think you'd have mfrs worried about people filling a rack full of fanless nodes and then not turning on the fans. Or the power failing to the fans, or, opening both doors.
I suppose some sort of overtemperature cutout would solve this: the mobo would just shut down if it got too hot.
Whatever happened to a Beowulf made of tower cases piled on brick and board book cases?
Or this incredibly adaptable scheme: http://climate.ornl.gov/~forrest/linux-magazine-1999/ note the easy reference information inscribed on each node in this novel heterogenous cluster. It's all part of addressing: "Management of such a large, heterogeneous cluster poses many challenges."
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org] On Behalf Of Bill Broadley
Sent: Friday, September 28, 2012 2:15 PM
To: beowulf at beowulf.org
Subject: Re: [Beowulf] let's standardize liquid cooling
Sounds expensive, complicated, and challenging.
How about a MUCH simpler proposal: eliminate fans from compute nodes.
* assume good front to back airflow
* have large fans front AND back that run at relatively low
rpm, and relatively quiet.
* If front or rear door open the other door would ramp up fans
(and noise) to compensate.
My measurements of 1U nodes have shown a significant fraction of the power budget goes to fans! Fans that fit in 1U (even 2U) nodes seem to generate more noise, heat, and vibration than airflow.
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