[42442] in North American Network Operators' Group
Re: Re[2]: telehouse - 25 broadway
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Sun Sep 16 11:24:03 2001
Date: Sun, 16 Sep 2001 11:23:27 -0400
From: Leo Bicknell <bicknell@ufp.org>
To: David Lesher <wb8foz@nrk.com>
Cc: nanog list <nanog@merit.edu>
Message-ID: <20010916112327.A14365@ussenterprise.ufp.org>
Mail-Followup-To: Leo Bicknell <bicknell@ussenterprise.ufp.org>,
David Lesher <wb8foz@nrk.com>, nanog list <nanog@merit.edu>
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In-Reply-To: <200109161510.LAA01573@sigma.nrk.com>; from wb8foz@nrk.com on Sun, Sep 16, 2001 at 11:10:30AM -0400
Errors-To: owner-nanog-outgoing@merit.edu
On Sun, Sep 16, 2001 at 11:10:30AM -0400, David Lesher wrote:
> This is just as much a case of matching equipment to application
> as is buying a new backbone router. Do you buy based on a "100 year
> flood" peak; the "Mothers Day calling" peak or the "105% of >1hr"
> model. Justify your decision the the beancounter. 25 points.
Every time I've seen a standby generator sized for a computer data
center the 'continuous run' figure was used for the maximum loading.
Data center loading is generally fairly well known, if you have a
N KW UPS, it's known to draw N + M KW on input at full load, and the
generator needs to be able to supply N + M for continuous run.
Overrun amounts are _very_ limited. Typically < 30 minutes @10%
over, and < 5 minutes @20% over. I don't think I've ever seen one
with a rating for more than 20% over. Even a bean counter won't
expect a power outage to be over in 30 minutes.
--
Leo Bicknell - bicknell@ufp.org
Systems Engineer - Internetworking Engineer - CCIE 3440
Read TMBG List - tmbg-list-request@tmbg.org, www.tmbg.org
