From owner-freebsd-questions@FreeBSD.ORG Wed Aug 11 20:06:47 2010 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 96E0F106564A for ; Wed, 11 Aug 2010 20:06:47 +0000 (UTC) (envelope-from gull@gull.us) Received: from mail3.sea5.speakeasy.net (mail3.sea5.speakeasy.net [69.17.117.42]) by mx1.freebsd.org (Postfix) with ESMTP id 6DCBE8FC1A for ; Wed, 11 Aug 2010 20:06:47 +0000 (UTC) Received: (qmail 552 invoked from network); 11 Aug 2010 20:06:46 -0000 Received: from dsl081-163-112.sea1.dsl.speakeasy.net (HELO ringbill.gull.us) ([64.81.163.112]) (envelope-sender ) by mail3.sea5.speakeasy.net (qmail-ldap-1.03) with AES256-SHA encrypted SMTP for ; 11 Aug 2010 20:06:46 -0000 Received: from localhost ([127.0.0.1] helo=www.gull.us) by ringbill.gull.us with esmtp (Exim 4.71 (FreeBSD)) (envelope-from ) id 1OjHZW-0005Qu-3F for freebsd-questions@freebsd.org; Wed, 11 Aug 2010 13:06:46 -0700 Received: from d-69-91-158-125.dhcp4.washington.edu ([69.91.158.125]) (SquirrelMail authenticated user gull) by www.gull.us with HTTP; Wed, 11 Aug 2010 13:06:46 -0700 Message-ID: <43a2b1b16a03a5c58dfb7beaadd0c535.squirrel@www.gull.us> In-Reply-To: <5304A319-0406-4510-B6B2-8FD609239FF9@cwis.biz> References: <3135A83C-6FD9-4C3B-958F-11EE85221061@mac.com> <5304A319-0406-4510-B6B2-8FD609239FF9@cwis.biz> Date: Wed, 11 Aug 2010 13:06:46 -0700 From: "David Brodbeck" To: "User Questions" User-Agent: SquirrelMail/1.4.20 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Subject: Re: UPS question 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: Wed, 11 Aug 2010 20:06:47 -0000 On Wed, August 11, 2010 12:25 pm, Ryan Coleman wrote: > He thinks that at 500W needed it would give me about 12 minutes on a > 1400VA. My consideration is, then, give the server 2 minutes on battery. > If full power has not been returned, shut down the server but leave the > modem (w/ wireless) and switch running with power for up to 6 hours. A bit of advice: If this is an unattended system, give some thought to how you will boot the server back up if the outage is longer than two minutes but shorter than six hours. Most UPS installations have *some* kind of race condition issue if power comes back after the servers have begun a shutdown, but in your case it's an unusually long window.