> Our lab has a homebrew ROCKS cluster in small computer room that relies > on a single air conditioner. My experience has been that the poweroff(8) > command can't be trusted, so you often end up having to turn off the > power manually. We had hardware damage when the A/C tripped the circuit > breaker recently. Now we want to add another cluster and a file server > so I'm anxious to have a reliable way to shut systems down when they get > too warm. How do other labs deal with this problem? APC et al will sell you remote-controlled power distribution units (with ethernet port plus individually controllable circuits). pretty easy to find on their site, once you know that they exist.