[sterwill]

Many years ago, I managed a server room with dedicated cooling on the 4th floor of a 4-story building with a flat roof. One night the temp alarms went off, and when I showed up water was dripping off my overhead Liebert unit and onto the racks.

And it wasn't even raining outside! So I grab some plastic to cover the racks and phone in emergency portable cooling as the room's AC started failing.

It turns out earlier that day, a technician performing seasonal maintenance on a boiler tank on the roof had drained the tank and refilled it. But instead of directing the water out into a proper drain, he sent it down a convenient pipe that was actually a vent from our ceiling into the boiler house. The boiler was dozens of meters from my server room, but the water followed the old steel and plaster ceiling remnants over to my computers.

And this boiler water was more exciting than rain: it came with all the dissolved minerals, metals, and preservatives computers crave! I didn't lose any computers in the racks, but it killed the Liebert's control board.