[Wlug] Detecting power failure

[John Stoffel]

Tal> I have a question about detecting power failures in Linux. I have
Tal> an Intel server sitting in a datacenter. It is running Crux 2.1
Tal> (a 2.6 kernel).  It is a 2U server with 2 power supplies. Does
Tal> anyone know if I can detect when 1 of the power supplies fails?

Depending on your server hardware and what the BIOS has configured,
take a look at acpid(8) daemon man page.  Or the apmd(8) man page.  

One of them should work for you.  As a simple test, pull one power
plug and watch the output of /var/log/messages and/or /var/log/dmesg
to see what shows up.   

I'm on a debian setup, but I found some more docs in
/usr/share/doc/acpid/README and I'm sure there are a bunch of docs if
you google for them.

Good luck!
John