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Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!haven.umd.edu!uunet!noc.near.net!bigboote.WPI.EDU!wtw From: wtw@elm.WPI.EDU (William T. Warner) Newsgroups: comp.os.386bsd.development Subject: Re: Powerfail / UPS implementation Date: 9 Apr 1993 04:20:37 GMT Organization: Dept of Computer Science, WPI Lines: 21 Message-ID: <1q2til$glr@bigboote.WPI.EDU> References: <2107@hcshh.hcs.de> <C51q9w.Fqo@agora.rain.com> <CGD.93Apr6010311@eden.CS.Berkeley.EDU> NNTP-Posting-Host: elm.wpi.edu In article <CGD.93Apr6010311@eden.CS.Berkeley.EDU> cgd@eden.CS.Berkeley.EDU (Chris G. Demetriou) writes: >In article <C51q9w.Fqo@agora.rain.com> rgrimes@agora.rain.com (Rodney Grimes) writes: >>Humm, maybe invoke shutdown with the number of minutes - 1 of time that >>the UPS can hold the sysem up. Then cancel the shutdown if AC comes back... > >"the number of minutes - 1" is a bit dubious; the survival time >of a system on a UPS is rather dependent on what's being supported >by the UPS... > >chris >-- >Chris G. Demetriou cgd@cs.berkeley.edu Yes. And anyway, some (such as the APC Smart-UPS) will tell you (via a signal line) when the battery is low. You can shut down when you get this signal, instead of trying to guess. Bill -- Bill Warner | Worcester Polytechnic Institute, CS graduate program. wtw@wpi.wpi.edu | ** Happy OS/2 2.x and 386BSD user **