data loss after power failure

[Amos Shapira]

2009/8/14 Micha Silver <micha at arava.co.il>:
> shimi wrote:
>> Sample the UPS unit for "how much battery time left do you have?"  and
>> initiate automatic shutdown when the number falls below the 5 minutes
>> threshold ?
>>
> Yes, that's probably best. Thanks. The disadvantage is that after the power
> comes back, someone has to physically go to power-up the servers.

Well, that's how UPS's are supposed to be used.

In addition to Wake-On-Lan mentioned by Shimi, there are also:
1. Boot on AC power - i.e. if the AC power comes back then start
reboot. That's a BIOS setting.
2. I think the smarter UPS's and BIOS also have something around
"power X seconds/minutes after AC comes back", to avoid booting on
spikes.

--Amos