[103229] in North American Network Operators' Group
Re: rack power question
daemon@ATHENA.MIT.EDU (david raistrick)
Sun Mar 23 10:30:38 2008
Date: Sun, 23 Mar 2008 14:29:12 +0000 (UTC)
From: david raistrick <drais@icantclick.org>
To: "Justin M. Streiner" <streiner@cluebyfour.org>
cc: nanog@nanog.org
In-Reply-To: <Pine.LNX.4.64.0803230242270.6907@whammy.cluebyfour.org>
Errors-To: owner-nanog@merit.edu
On Sun, 23 Mar 2008, Justin M. Streiner wrote:
> and and I do have some that can draw close to or over 3000W on a continuous
> basis. A fully populated 6513 with power hungry blades could eat 6000W.
Easily. The HP blades I have right now are 14 servers in 10u, 6-7,000W.
Breaker on it needs to be for over 10,000W. (30x208x1.73 for 30A 3 phase)
With our 1u servers, we're able to get about 12 or so in a rack with a 20A
208V single phase (my exact budget numbers are behind a vpn I don't feel
like firing up...;) plus a pair of switches.
At 370W (peak), i'd need 15540W to power 42 of them, 27,972W at the
breaker (I prefer 75 to 80% of breakered capacity vs the NEC's 85%).
Works out to something like 4 30A 208v single phase circuits and 1 20A.
So 29120W at the breaker.
That's a lot of hot air. ;)
...david
---
david raistrick http://www.netmeister.org/news/learn2quote.html
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