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Re: DATACENTER: Cooling and Cost Data for Web Hosting Data Centers
At 08:55 AM 12/9/99 -0500, [email protected] wrote:
>
>On Wed, 8 Dec 1999, Dave Siegel wrote:
>
>> > > Wouldn't 100A per rack be a good number? That's what I am using, then
>> > > aggregating actual as we grow i.e. I'm not installing full load of
>> > > 10 tonners everywhere, just half and adjusting as we fill an average
>> > > of 50-80Ksq.f
>> >
>> > What?
>> > You've _got_ to be kidding.
>> > 100A per rack?
>> > Short of a small load bank, I don't know how you could do that.
>>
>> A Cisco 12012 requires 2 -48VDC 60A circuits. 3 6509's require 6 20A
110VAC,
>> and would fit in a single rack. Larger routers require even more current.
>>
>
>When you have redundant power supplies, the load is usually shared between
>them, but every _single_ supply should be able to handle the whole load,
>should it happen to be the only one left when the others fail. So if a
>device requires 2 30A circuits, that really means that 30A (not 60A) is
>the absolute maximum this device will ever consume. The 30A figure is
>there for you to provide the right gauge wire to avoid fires, and from the
>fire regulation point of view, you should expect the device to consume all
>60 amps.
>
>A 6509's will never ever exceed 20A (or it would be rated higher, lest the
>wiring is a fire hazard), and realisitcally speaking, it probably consumes
>between 3 and 15 Amps depending on what it has in it.
Huh? I'm fusing 6509's/DC at 35A.
-M
Regards,
--
Martin Hannigan [email protected]
Senior Network Engineer P: 617.788.0965
CO Space Services, LLC F: 617.788.0999
Somerville, MA Page: [email protected]