Date: Fri, 27 Sep 2002 14:00:33 +0300 From: Petri Riihikallio <Petri.Riihikallio@Metis.fi> To: questions@FreeBSD.ORG Subject: Re: How to shut down cleanly by killing power Message-ID: <a05111b01b9b9ea46ac33@[192.168.0.2]>
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>No, you are not the only one using UPS, but in my case, I don't use NUT and >don't quite understand the problem you have with the shutdown. My scripts >use shutdown -p just fine (rather than shutdown -h). It will only use that >when it reaches the final designated time to do so. If power returns, then >it stops the countdown just flawlessly and returns to normal operations. It Thanks for your reply! Have you thought about this situation: 1. The UPS is almost empty, and the monitoring system issues shutdown -p 2. The system starts the shutdown sequence. It can take well over a minute. There is no way to stop it now. 3. Power returns before the UPS is completely empty. Now the system has shut down with the -p flag, but power is continuously available. The system won't boot automatically, no matter what you have set up in BIOS, because the power never was down. It is a timing issue. That's why UPSes have a way of killing battery power. This guarantees at least a short break of power. When the power returns, the BIOS settings can start the system. I currently have a setup like yours, but now that I am aware of the possibility of deadlock, I would like to avoid it. -- Cheers, Petri Metis / Petri Riihikallio GSM: +358 400 505 939 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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