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Date: Mon, 1 Jun 2009 12:43:49 -0700
From: Andrew Sharp <andy.sharp@onstor.com>
To: Cary Kosher <ckosher@atrato.com>
Cc: dayers@atrato.com
Subject: power consumption figures
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On Mon, 1 Jun 2009 09:18:00 -0700 Cary Kosher <ckosher@atrato.com>
wrote:

> Hi Andy,
> 
> Here is some data on power consumption for the V1000.  The controller
> is 425W.  The SAID is 1000W.  A system can have multiple
> SAIDs/controller.  As an example, a 240TB system (3 SAID's, 100W each
> + 1 controller, 425W) would be a total of 3425W.  All 160 drives are
> always spinning.  Thus, there is no "at rest" data. 
> 
> Let me know if you have other questions.

Hi Cary,

So my first question is what do these numbers include.  The 1KW for the
SAID sounds high to me.  From Thomas M. Ruwart's white paper, one
drive consumes 2.3 watts, which puts the power draw from just the
drives at about 370.  Can the fans and power supplies really more than
double that?  It sounds like these are maybe 750GB drives, so maybe
they use more power than the 320GB drives mentioned in the paper.
Still, they shouldn't be double?

Also, does the head unit (controller) actually use 450 watts or is that
what it's PS is rated for?  I thought Don said something about 250, but
it was pretty loud in the lab, perhaps I mis-heard.

At 1000watts per SAID, it would be tough to get 500TB in a single
rack.  Unless you know of a 120A rack ~:^)  The reason I mention that
is the paper mentions 1PB would fit in 2 racks.

Cheers,

a
