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Date: Wed, 10 Jun 2009 15:30:44 -0700
From: Andrew Sharp <andy.sharp@onstor.com>
To: James DuHadway <jduhadway@atrato.com>
Subject: Re: power consumption figures
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OK, sorry to interrupt.  I was going to suggest that maybe I could do
it myself with my little plug in watt meter if there was somewhere
nearby I could get access to a machine.

Thanks,

a

On Wed, 10 Jun 2009 15:23:37 -0700 James DuHadway
<jduhadway@atrato.com> wrote:

> Andrew,
> 
>       I'm in the middle of something, you'll have the breakdown
> tonight.
> 
> Jim
> 
> -----Original Message-----
> From: Andrew Sharp [mailto:andy.sharp@onstor.com] 
> Sent: Wednesday, June 10, 2009 4:22 PM
> To: James DuHadway
> Subject: Re: power consumption figures
> 
> 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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