I would suggest against "Staying up as long as possible". Unless you own a massive UPS designed for that - I prefer the total shutdown in 2-5 minutes.
My rationale. You stay on for ages (~30 mins) on your little AUD$500 UPS. Power drains out - system shuts down. Good. Mains power comes back on. System starts up. Power goes out again !@$$! - as the workmen try a few times to get the power back online - with varying degrees of success - continued brown outs. Mains power =could= fail again and again in a short period of time as power grids re-align and power comes online and offline from anywhere in the country (this is electricity - not water remember). And the UPS may not have enough power to start all the way up again and then shutdown cleanly. This equals a problem. With a short run time and with the UPS set to also shut itself down and start-up when mains comes back online - with the Server also set to turn on when mains power is returned. The system/ups can handle a 'bumpy' patch with adequate power to handle many powerup/power down cycles. =IF= the system was *so* important that it did need to stay up as long as possible, you'd have hot swap batteries, onsite tech's, failover boxes in different location, generators, etc. Treat the UPS as a parachute for a safe landing and not some kind of primitive plane designed to keep you in the air. I don't think it works too well that way - and I have my sky diving license (though it needs renewing). :) Cheers, Richard. ----- Original Message ----- From: "Michael Doerner" <[EMAIL PROTECTED]> To: "Gordon Rowell" <[EMAIL PROTECTED]> Cc: "e-smith-devinfo" <[EMAIL PROTECTED]> Sent: Thursday, October 25, 2001 2:43 PM Subject: Re: [e-smith-devinfo] apcupsd > > Out of interest, is there something which apcupsd does, which the powstatd > > module does not? This works for APC and non-APC UPS models. > > > > http://www.e-smith.org/docs/howto/contrib/UPSHOWTO.txt > > > > I like the monitoring features through it's web interface, and use > (internally) it's master/slave features to protect our production plus test > server with 1 UPS only. > The test server will shutdown itself after 2 minutes without power so it > doesn't take too much off the UPS to keep the production server going as > long as possible. > > And I don't want to say anything bad about powstatd. I just started early > with apcupsd and I am still happy with it. > > Kind Regards, > Michael Doerner > > > > > -- > Please report bugs to [EMAIL PROTECTED] > Please mail [EMAIL PROTECTED] (only) to discuss security issues > Support for registered customers and partners to [EMAIL PROTECTED] > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > Archives by mail and http://www.mail-archive.com/devinfo%40lists.e-smith.org > > -- Please report bugs to [EMAIL PROTECTED] Please mail [EMAIL PROTECTED] (only) to discuss security issues Support for registered customers and partners to [EMAIL PROTECTED] To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Archives by mail and http://www.mail-archive.com/devinfo%40lists.e-smith.org
