Date: Wed, 11 Aug 2010 15:18:01 -0500 From: Ryan Coleman <ryan.coleman@cwis.biz> To: David Brodbeck <gull@gull.us> Cc: User Questions <freebsd-questions@freebsd.org> Subject: Re: UPS question Message-ID: <3AB9F23A-B56C-4176-83C9-F248161066B9@cwis.biz> In-Reply-To: <43a2b1b16a03a5c58dfb7beaadd0c535.squirrel@www.gull.us> References: <E1B44814-1433-4FBE-902B-BCC1944FBFCD@cwis.biz> <3135A83C-6FD9-4C3B-958F-11EE85221061@mac.com> <5304A319-0406-4510-B6B2-8FD609239FF9@cwis.biz> <43a2b1b16a03a5c58dfb7beaadd0c535.squirrel@www.gull.us>
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On Aug 11, 2010, at 3:06 PM, David Brodbeck wrote: > 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. 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. Additionally I spent $34 on a video card today that reduces my power consumption by 150Watts, resulting in a $13 per month savings in my powerbill - in MN we have a fixed-rate utility fee structure per season (winter power costs less than summer, I believe, for whatever reason) and a $10 mail-in rebate on the card means I will be turning a net profit in 2 months! -- Ryan
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