[Beowulf] Opteron cooling specifications?

Joel Jaeggli joelja at darkwing.uoregon.edu
Sun Apr 30 13:10:07 EDT 2006


On Sun, 30 Apr 2006, David Kewley wrote:

> On Sunday 30 April 2006 00:12, John Hearns wrote:
>> On Sat, 2006-04-29 at 18:08 -0700, David Kewley wrote:
>>> What does it mean to say that 32 is "standard"?  Why shouldn't 40 be
>>> standard, other than perhaps 32 is more typically done?
>>
>> Surely related to the maximum amperage you supply to the rack?
>> With dual cores and now quad socket systems current draws per node are
>> going up. In European installs, I see 2 times 32 Amp feeds per rack
>> being normal.
>
> But there's not a "standard" maximum amperage you can supply to a rack.  As
> long as you have the power available, and have the means to remove the
> heat, you can do what you want.  We're an example, and I would be
> astonished if we're the only example.  If we are, it seems to me something
> is wrong with "standard" ways of thinking.
>
> My point is, the word "standard" tends to suggest that doing anything else
> is to be discouraged, out of the ordinary, etc.  I see *no* reason that 32
> nodes should be considered "standard".  If you can only supply 20 A to a
> rack, *your* standard will be just a few nodes per rack.  If you can supply
> 100 A to a rack, *your* standard will be much higher.  So there is no
> "standard" that applies to all sites.
>
> No?

50u racks are also available (I've seen them in colo facilities)... 
personally I don't like racking things that far over my head.

We've being switching cabinets in one of our datacenters to 220volt 
service to support the sort of density we're seeing without running new 
conductors.

> David
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Joel Jaeggli  	       Unix Consulting 	       joelja at darkwing.uoregon.edu
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