Happened to us a week or so ago. Power went out overnight, came on and everything was OK, but the next night the AC turned itself off in our primary server room. The next morning the outside of wooden door into the room was hot. Inside it was like a sauna - 5 racks all pumping out heat. The modems in the room melted. Only 1 server shut itself down - all the others were up. You couldn't touch the racks.

To get it cool we held the door wide open, used 4 big fans and turned off half the servers. Took 3 hours to get it bearable. We lost 2 disks on top of the modems and that was it fortunately.

The AC engineer said there was nothing wrong with the unit and it has been OK since. We've no choice but to go with the thing. Scary. Of course our LTO drive backup units were also in there. God knows what will fail over the next few weeks.

Guess we were lucky this time.