North American Network Operators Group

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Re: rack power question

  • From: david raistrick
  • Date: Sun Mar 23 10:31:33 2008

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 raistrick [email protected]