Date: Tue, 17 Feb 1998 10:29:57 -0500 From: dennis <dennis@etinc.com> To: shimon@simon-shapiro.org Cc: hackers@FreeBSD.ORG Subject: Re: WatchDog Timer Message-ID: <3.0.32.19980217102956.00eb2940@etinc.com>
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At 02:23 PM 2/16/98 -0800, you wrote: > >On 16-Feb-98 Julian Elischer wrote: >> eh? >> what watchdog? >> we have a hook that is called by the kernel >> when it is doing long uninterrupted operations (e.g. dumping core) >> but it's just a hook. The user needs to supply their own hardware >> watchdog.. (and code to tickle it) >> >> julian > >If there is no driver for such hardware today, I'll write it this week. >This is really not the same as a kernel's internal watchdog. What we are >talking about here is used to build a dead-man switch; In case of O/S >catastrophic failure, this device will reboot the machine, or in the case >of HA/FT, signal to the rest of the ``system'' that a Unix instance just >died. > >I simply do not want to write a driver that was already written. >What is the kernel's hook name/path? Maybe we can merge the two, or at >least relate to each other. As in ``If the kernel is busy with a long, >uninterrupted operation, we automatically mask off the dead-man switch''. We have hardware that will do this, you need a physical device to hard reboot the machine as software reboots are imperfect. We're in semi-production, but dont really push it. 2 of our serial boards also have one integrated on them. Dennis To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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