Power loss behaviour - is there some basic action?

[Sam Varshavchik]

Bo Berglund writes:

> But last summer there was a couple of longer "planned" maintenance outages by
> the electricity company and I was at home for the first of these.
>
> What happened then was that after about an hour the server shut down (via a  
> nut
> command from the NAS), but when power returned it did not start up again.

A reliable recovery from power failure+restore requires several moving  
pieces:

- Some kind of support from BIOS, to turn on the system when power is  
restored, without requiring a manual button push. Usually it's a  
configuration setting somewhere in BIOS that says something along the lines  
"action when powered up: last known state", so if the system was shut down  
when power was lost it will remain shut down, or if the system was turned  
on, it will power up.

- A "smart" UPS which can be controlled by software. The software tells the  
UPS to cut the power to the system, and restore it when the mains come back  
online.

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