Re: Power for farm racks

[Elton Smith <elton@jlab.org>]

Hi Chris,

I spoke to Andy about power consumption in the racks for the farm. They
use 4 20A@110 breakers per rack = 8KVA. At the moment they are using dual
processors. The most power hungry versions use 4A at 110V (0.4 KVA) per
box x 12.5 boxes per rack = 5KVA (uppper limit on actual usage).

The network switch actually comsumes considerable power, about 4 20A@230V
~ 20 KVA. Unlike electronics in general, switches seem to require more
power as they go to higher speeds, not less, so we need to follow this
requirement carefully.

Cheers, Elton.





Elton Smith
Jefferson Lab
elton@jlab.org
(757) 269-7625

On Sat, 4 Mar 2006, Elton Smith wrote:

>
> Hi Andy,
>
> Can you give me an estimate of the AC power, and cooling power required
> for the farm racks you have? I am currently assuming 25 nodes/rack
> (rounded up from 24). We need to give the civil feedback on these
> requirements. At the moment, we have been assuming they consume the same
> amount of power as our electronics, but they might need more.
>
> Thanks, Elton.
>
> Elton Smith
> Jefferson Lab
> elton@jlab.org
> (757) 269-7625
>