On Sat, 2010-06-26 at 23:10 +0200, Björn Persson wrote:
Chris Adams wrote:
> Once upon a time, Simo Sorce <ssorce(a)redhat.com> said:
> > Ideally your UPS is smart enough to sense when the load drops to 0,
> > and do whatever it needs to do w/o system intervention of any sort. If
> > your UPS can't do that, maybe it is time to look for alternatives :)
>
> That's nice if you only have a computer plugged into the UPS (even then,
> the load will never go to 0, due to ATX standby current). However, here
> in the real world, I have a router, switch, DSL modem, monitor,
> speakers, etc. on my UPS.
There exist a certain kind of power strips where you plug the computer into a
special controlling outlet, and all the peripherals into the other outlets.
When the current drawn through the controlling outlet drops below an
adjustable threshold, it cuts off power to the other outlets. If you'd put such
a device between your UPS and your computer equipment, the UPS would then
sense (if it has this feature) that the load has dropped to a very low value.
Remember, this all started as a discussion about how shutdown scripts
should work. Assuming all our UPS users have smart UPSes and also smart
power strips seems something of a stretch.
--
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org
http://www.happyassassin.net