hardware security with IPMI

Shits appens, it's a sure thing.

See http://blog.neds.com/blog/tabid/51329/bid/7203/Redundancy-in-Data-Centers-How-Redundant-Became-a-Good-Thing.aspx for example.

How will your server respond when your computer room air conditioning will fail ?

You can prevent this by setting lower critical temperature on the hardware board.

ipmitool sensor thresh "Ambient Temp" ucr 35

ipmitool sensor thresh "Ambient Temp" unc 25

With theses settings, when temp reach 35°, your server will stop, and with a little wake on lan, you will be able to put them them easily and remotely.