One more thing to watch out for at data centers - fire drills

Another unexpected result when we had an all-out Halon test: thick fog, apparently from cold gas and somewhat humid air. I'm glad to have been watching through windows. Visibility in the room dropped to zero.

All of these discussions sounds infinitely safe for humans.

Servers and network gear is replaceable. Sounds like the failure was not one of
DC mismanagement but human safety errors.