[Beowulf] Rear-door heat exchangers and condensation

John Hearns hearnsj at googlemail.com
Fri Dec 12 12:35:34 EST 2008


I was down in our server room with the ICE this afternoon. Its worth
describing how they are put together for the purposes of this thread.

Each rack has four blade chassis in it. These are called Independent Rack
Units in SGI speak.
An IRU has sixteen compute blades, plus the mains PSUs and Infiniband
blades.
Each IRU has an L1 chassis controller.

At the rear of each IRU there is a bank of big fans. Each IRU couples up to
a 1/4 sized rear rack door, using a foam gasket. Each of these 1/4 sized
doors is a swing out heat exchanger.

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