Originally Posted by
RevMan2
Any decent data centre has an array of batteries that kick in as soon as one of the main power supplies( you'll normally have 3) fails and keep the machines running until the whacking great diesel generator (kept at operating temperature) takes over. It'll have fuel for the next 48 hours.
And you'll have your core systems mirrored.
This is industry standard.
It might be the "industrial standard" but util the power actually fails, you don't know if that generator will actually start or be switched in.
A good datacenter will have at least 2 separate ups's for A and B feeds to servers, and failover supplies for equipment that have only 1 actual power supply. But very few will have a second generator setup that will start if the first one don't. Then you have only minutes of ups power to find out why the generator didn't start. And complicated servers/storage and relational databases don't like sudden stops.