In article ,
Andy Burns wrote:

Usually in a rack setup like this each server has two PSUs, one supplied
direct from mains (with generator backup) the other supplied from mains
via UPS.

Or even better, both feeds from UPS protected feeds, with gen backup.

Of course, then someone buys a bloody sun server with one power lead or
even worse, one with *3* power feeds.

Stupid bloody machines. Thankfully, I think sun have stopped that now

Darren