Date: Thu, 10 Jan 2008 18:14:21 -0500 From: "Bob Johnson" <fbsdlists@gmail.com> To: "Derrick Ryalls" <ryallsd@gmail.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Nut and RAID on FreeBSD 7.0 Message-ID: <54db43990801101514y317a2889l7ad18fa4ffce56be@mail.gmail.com> In-Reply-To: <d5eb95fc0801101443l6b4cd69do6d69d5b90cd91702@mail.gmail.com> References: <d5eb95fc0801091651h1788afd1m256a824e4722906d@mail.gmail.com> <6.0.0.22.2.20080110025841.023a9bb8@mail.computinginnovations.com> <d5eb95fc0801101140w717095dfhed569274c261e4a6@mail.gmail.com> <6.0.0.22.2.20080110155430.023d29d8@mail.computinginnovations.com> <d5eb95fc0801101443l6b4cd69do6d69d5b90cd91702@mail.gmail.com>
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On 1/10/08, Derrick Ryalls <ryallsd@gmail.com> wrote: > > Perhaps I need to re-evaluate my line of thinking. Light sometime > flicker, but power almost never goes out. When it does it is either > back on in less than 1 minute, or out for hours. If the UPS detects > critical correctly and gives me at least a minute before death, then > that should be plenty of time for the system to auto-shutdown. Guess > I will have to do some experimentation tonight. While you experiment, keep in mind the following sequence of events: -- Power fails -- UPS signals low battery -- System shuts down -- Power returns before UPS shuts itself down --> System never reboots, because it never lost power. Getting around this is the tricky part. I haven't used NUT in about seven years, but back then the recommendation was to shut down to single user mode and run a script that delayed for some time longer than the remaining battery life of the UPS, then rebooted the system. There didn't seem to be an easy hook for running a script after shutting down to single user mode (maybe there is now). I haven't looked at NUT recently, but I expect the various flags that you are supposed to test are another way around this problem. - Bob
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