At 03:55 AM 7/14/00 , you wrote:
>All,
>
>I'm looking for a good watchdog card for Linux and am coming-up short.
>Any pointers?
I don't know what a 'watchdog card' is. There are software packages like
'heartbeat' that monitor something and raise an alarm if that something stops.
>Another thing I'd like to try out is some sort of device which will
>reboot a Linux server remotely if need-be. Sometimes you get into a
>situation where the kernel hasn't crashed, and still answers pings, etc.
>and would probably look to a hardware watchdog like everything's okay,
>but the machine is still unreponsive and you can't telnet to it.
I don't know if it's still being made but we have a set of devices called,
I think, X10 or X11 that are designed for this. There are client devices
that mediate between the computer and the wall socket and another device on
the controlling computer's serial port (and also plugged into the wall
socket). You have to write serial port software to control the client
computers. I've seen similar units sold for home automation. IIRC, they
don't work across circuit boundaries and they require that the controlled
devices actually get plugged into the wall (as opposed to, say, a UPS).
All that said, the only times I've ever had to reset a Linux box was when I
was screwing around with the hardware. (We bought these X10 units for
controlling a multi-computer DOS-based homegrown C process for processing
faxed test scores into psychological reports.) So I don't know whether I
would bother.
-Alan
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