[Beowulf] Rear-door heat exchangers and condensation

Huw Lynes lynesh at cardiff.ac.uk
Tue Dec 9 10:14:46 EST 2008

On Tue, 2008-12-09 at 14:52 +0000, John Hearns wrote:
> 2008/12/9 Kilian CAVALOTTI <kilian.cavalotti.work at gmail.com>
>         Hi all,
>         I'd be curious to know if some of you use or have some
>         real-life experience
>         with rear-door heat exchangers, such as those from SGI [1] or
>         IBM [2].
> Killian, yes indeed. I manage both an SGI Altix with the rear-door
> heat exchangers, and an ICE cluster.
> We are lucky enough to have our own lake for a cooling pond. Grin.
> I think these are the cat's pyjamas - the SGI ones come in four
> horizontal 'stable doors' so you can swing one open for an extended
> amount of time to work on the rear of systems without overheating the
> whole rack.

How much cooling do you lose when opening the rack to do work on it? 


Huw Lynes                       | Advanced Research Computing
HEC Sysadmin                    | Cardiff University
                                | Redwood Building, 
Tel: +44 (0) 29208 70626        | King Edward VII Avenue, CF10 3NB

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