From owner-freebsd-questions@FreeBSD.ORG Wed Aug 11 23:54:22 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 EB2051065686 for ; Wed, 11 Aug 2010 23:54:22 +0000 (UTC) (envelope-from ryan.coleman@cwis.biz) Received: from qmta03.emeryville.ca.mail.comcast.net (qmta03.emeryville.ca.mail.comcast.net [76.96.30.32]) by mx1.freebsd.org (Postfix) with ESMTP id CE5BB8FC1E for ; Wed, 11 Aug 2010 23:54:22 +0000 (UTC) Received: from omta15.emeryville.ca.mail.comcast.net ([76.96.30.71]) by qmta03.emeryville.ca.mail.comcast.net with comcast id tBiq1e0091Y3wxoA3BuNeT; Wed, 11 Aug 2010 23:54:22 +0000 Received: from [10.0.1.9] ([76.113.183.74]) by omta15.emeryville.ca.mail.comcast.net with comcast id tBuL1e0051cjQTw8bBuM69; Wed, 11 Aug 2010 23:54:22 +0000 Mime-Version: 1.0 (Apple Message framework v1081) Content-Type: text/plain; charset=us-ascii From: Ryan Coleman X-Priority: 3 (Normal) In-Reply-To: Date: Wed, 11 Aug 2010 18:54:19 -0500 Content-Transfer-Encoding: quoted-printable Message-Id: References: <3135A83C-6FD9-4C3B-958F-11EE85221061@mac.com> <5304A319-0406-4510-B6B2-8FD609239FF9@cwis.biz> <43a2b1b16a03a5c58dfb7beaadd0c535.squirrel@www.gull.us> <3AB9F23A-B56C-4176-83C9-F248161066B9@cwis.biz> To: David Brodbeck X-Mailer: Apple Mail (2.1081) Cc: freebsd-questions@freebsd.org 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 23:54:23 -0000 On Aug 11, 2010, at 6:01 PM, David Brodbeck wrote: > On Wed, August 11, 2010 1:18 pm, Ryan Coleman wrote: >> On Aug 11, 2010, at 3:06 PM, David Brodbeck wrote: >>=20 >>> 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. >>>=20 >>> 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. >>=20 >> Meaning that my 2-minute window is unusually long? If the UPS can = support >> the system for 12 minutes, I say give it 20% of the life of the = support >> because our power outages here are usually spikes that kill my = current web >> server (but amazingly *not* my file server). In fact, one of those = power >> fluxes occurred last night. I love storms for the light shows, but = hate >> them for the toll they take on my servers. >=20 > Nope, 2 minutes is fine, maybe even short depending on how long your > system takes to shut down. What I'm asking about is this scenario: >=20 > 1. Power goes out. > 2. Server shuts itself down after 2 minutes. > 3. Power comes back on before the UPS batteries are exhausted. >=20 > The server never sees a power cycle, so it doesn't boot itself back up > until someone physically goes and pushes the button. Good points. I just want to make sure it has a safe shutdown (the usual = reason for a UPS) but it will be set with a BIOS turn on time if it is = not on. This is for a mirrored archive that updates overnight. If it is = in the middle of the process it will kill and shut off. Most power outages in my area are 1) during the hottest days of the = summer - like today and 2) last less than 60 seconds. It's biggest draw = is to give it a steady stream of power. -- Ryan=