From owner-freebsd-questions@FreeBSD.ORG Mon Oct 8 08:18:48 2007 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 90E8A16A417 for ; Mon, 8 Oct 2007 08:18:48 +0000 (UTC) (envelope-from pieter@degoeje.nl) Received: from smtp.utwente.nl (unknown [IPv6:2001:610:1908:1000:204:23ff:feb5:7e66]) by mx1.freebsd.org (Postfix) with ESMTP id 06E9713C44B for ; Mon, 8 Oct 2007 08:18:47 +0000 (UTC) (envelope-from pieter@degoeje.nl) Received: from lux.student.utwente.nl (lux.student.utwente.nl [130.89.170.81]) by smtp.utwente.nl (8.12.10/SuSE Linux 0.7) with ESMTP id l980a6Hh031661; Mon, 8 Oct 2007 02:36:06 +0200 From: Pieter de Goeje To: freebsd-questions@freebsd.org Date: Mon, 8 Oct 2007 02:36:05 +0200 User-Agent: KMail/1.9.7 References: <20071006231203.GA65801@thought.org> <47084E80.3010003@pacific.net.sg> <20071007194446.GA69551@thought.org> In-Reply-To: <20071007194446.GA69551@thought.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200710080236.05888.pieter@degoeje.nl> X-UTwente-MailScanner-Information: Scanned by MailScanner. Contact helpdesk@ITBE.utwente.nl for more information. X-UTwente-MailScanner: Found to be clean X-UTwente-MailScanner-From: pieter@degoeje.nl X-Spam-Status: No Cc: Gary Kline , Erich Dollansky Subject: Re: what kind of UPS will work best? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Oct 2007 08:18:48 -0000 On Sunday 07 October 2007, Gary Kline wrote: > First, thank to both you and Bart for your cmments. You were > *right* about the price. Can I assume that a ballpark would be > 400W for each server? (My wife is right: I've got to cut back to > three computers:-) I've found one APC 2200VA with a 17minute > uptime. 3 times 400W, yes? I think this is overkill. Some time ago I was wondering the same thing and to verify my guess on the overall power usage of my servers I bought a VA/Watts meter (EUR. 39,-). Turns out average wattage is about 90watts per server idle and max 130watts under load. On powerup they will use a max. of 180watts for less than a second. The servers are simple dual cores with about 2 harddisks each. (no screens or other devices attached) Also, the powerfactor was ~0,95 so that means that for every Watt of apparent power (VA) almost a Watt of real power was used. Thus, for my servers I would need something like a 500Watt/600VA UPS. So my advice is: don't guess but measure. Cheers, Pieter de Goeje