https://news.ycombinator.com/item?id=19381520
"systems at IronMountain (formerly Fortrust) in Denver all rebooted at once. These are all on redundant power, each systems redundant power supplies connecting to different circuits entering the cabinet, and those two circuits fed from 3 PDUs (two separate, one share). Each of those is supposed to be fed by a separate UPS and generator. Last status update I had says that they are running off generators, but they've been shockingly tight-lipped about it."