Energy consumption vs % utilization?

Hannigan, Martin hannigan at
Tue Oct 26 20:27:05 UTC 2004

Sure but colo's dont operate on variances of power based on CPU.
They operate on committed power to cabinet i.e. 120W per cabinet
etc. and the ability to cool a fully loaded facility.

If you had a thousand CPU's use 1W more all at the same time it's
equal to about 9.5A. 1KX2W = 20A, 1KX3W=31A, etc. etc.

Martin Hannigan                         (c) 617-388-2663
VeriSign, Inc.                          (w) 703-948-7018
Network Engineer IV                       Operations & Infrastructure
hannigan at

> -----Original Message-----
> From: owner-nanog at [mailto:owner-nanog at]On Behalf Of
> james edwards
> Sent: Tuesday, October 26, 2004 4:18 PM
> To: Alex Rubenstein
> Cc: nanog at
> Subject: Re: Energy consumption vs % utilization?
> > Thats an insane statement.
> >
> > Are you saying, "You are only wasting money on things if you aren't
> > profitable" ?
> >
> > /action shakes head.
> No, I am not but my statement did sure sound like that was what I was
> saying.
> I do think it is apples or oranges comparing CPU % to total 
> power used and
> coming up
> with a wasted factor. My colo needs X amps/hour just to run 
> at idle, I don't
> call this waste.
> It is the cost of doing business. Power factor causes losses. 
> So you need
> enough customers to cover
> this and other expenses.
> I guess we need a definition of waste here.
> I would say the the heat produced by pulling all the amp/hrs 
> is waste. It
> could be possible to harvest
> this and reuse it elsewhere.
> So, just because you are profitable does not mean there is no 
> waste but it
> also depends on how you
> classify waste. Also, do the methods to avoid this waste 
> justify (pay for
> over time) their use.
> James H. Edwards
> Routing and Security Administrator
> At the Santa Fe Office: Internet at Cyber Mesa
> jamesh at  noc at
> (505) 795-7101

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