[108395] in North American Network Operators' Group
RE: Google's PUE
daemon@ATHENA.MIT.EDU (Alex Rubenstein)
Wed Oct 1 18:22:25 2008
Date: Wed, 1 Oct 2008 18:22:19 -0400
In-Reply-To: <48E3F577.4050308@vaxination.ca>
From: Alex Rubenstein <alex@corp.nac.net>
To: =?iso-8859-1?Q?Jean-Fran=E7ois_Mezei?= <jfmezei@vaxination.ca>,
<nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
> Google not counting electricity losses from power cords etc gives the
> image that it doesn't really want to account everything and want to
> skew the numbers as much as possible.
I don't agree with this.
It is commonly accepted that when computing DCIE/PUE, the point of =
"demarcation" (used that term for the telco crowd) is the receptacle. If =
they did not include losses in transformation, UPS, distribution, etc., =
then I would agree. But they seem clear about that in the discussion.
> I would be far more interested in a metric that shows the amount of
> power used for each MIPS of CPU power (or whatever CPU horsepower
> metric other than clock speed). And also amount of power used for each =
gbps of
> telecom capacity USED.
>
> Another metric would be how much power is used to store how many
> terabytes of data on disk. Disks consume much power too.
I think you mean "energy", not telecom. While what you ask for is very =
important, that is generally a function of efficiency of a piece of =
equipment closed to the consumer. In other words, how efficient a Dell =
is vs. a HP or something. These things do not relate to the definition =
of PUE/DCIE.
> To me, it seems that PUE is just a metric of how efficient the air
> conditioning is.=20
This is the point. It's a metric of the FACILITY, not the COMPUTATION.
