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Date: Wed, 10 Jun 2009 15:21:50 -0700
From: Andrew Sharp <andy.sharp@onstor.com>
To: James DuHadway <jduhadway@atrato.com>
Subject: Re: power consumption figures
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Hi Jim,

Like to make some progress on this.  Are you local in the Bay Area?  If
so, can you give me a quick call on my cell: 650-906-9448.

Thanks,

a


On Mon, 1 Jun 2009 15:28:36 -0700 James DuHadway <jduhadway@atrato.com>
wrote:

> Cary/Andy, checking into this.
> 
> Jim
> 
> -----Original Message-----
> From: Cary Kosher
> Sent: Monday, June 01, 2009 4:26 PM
> To: Andrew Sharp
> Cc: Don Ayers; James DuHadway
> Subject: RE: power consumption figures
> 
> Jim, can you help Andy with this?  Thanks.
> 
> -----Original Message-----
> From: Andrew Sharp [mailto:andy.sharp@onstor.com]
> Sent: Monday, June 01, 2009 12:44 PM
> To: Cary Kosher
> Cc: Don Ayers
> Subject: power consumption figures
> 
> 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
> 
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