nanog mailing list archives
RE: rack power question
From: Jon Lewis <jlewis () lewis org>
Date: Sun, 23 Mar 2008 13:33:25 -0400 (EDT)
On Sun, 23 Mar 2008, Ray Burkholder wrote:
My desktop has a 680 Watt power supply, but according to a meter I once connected, it is only running at 350 to 400 Watts. So if a server has a 980W power supply, does the rack power need to be designed to handle multiples of such a beast, even though the server may not come close (because it may not be fully loaded with drives or whatever)? Wouldn't it be better to do actual measurements to see the real draw might be?
This depends on who's providing the power. If it's your power and your servers, you can "know" that your 980W supplies are really only using 600W, be happy, and plan accordingly if you upgrade later.
If you're providing the power, but it's someone else's gear, you better have good communication when it comes to power requirements/utilization, because what happens when they install more drives/processors next month, and those systems that were using 600W suddenly are using 800W each?
When providing/planning UPS power, if you sell a 120V 20A circuit, do you budget 120V 20A of UPS power for that customer, or 16A (80%), or even slightly more than 20A (figuring worst case, they're going to overload their circuit at some point) when deciding how full that UPS is?
---------------------------------------------------------------------- Jon Lewis | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
Current thread:
- Re: rack power question, (continued)
- Re: rack power question Martin Hannigan (Mar 28)
- Re: rack power question John Curran (Mar 22)
- Re: rack power question Justin Shore (Mar 22)
- Re: rack power question Lamar Owen (Mar 24)
- RE: rack power question John Lee (Mar 22)
- Re: rack power question Justin M. Streiner (Mar 23)
- Re: rack power question david raistrick (Mar 23)
- Re: rack power question Leo Bicknell (Mar 23)
- Re: rack power question Petri Helenius (Mar 23)
- RE: rack power question Ray Burkholder (Mar 23)
- RE: rack power question Jon Lewis (Mar 23)
- RE: rack power question John Curran (Mar 23)
- Re: rack power question Paul Vixie (Mar 23)
- RE: rack power question Mike Tancsa (Mar 23)
- Re: rack power question Petri Helenius (Mar 23)
- Re: rack power question Lamar Owen (Mar 24)