On Wed, Dec 21, 2011 at 10:47 AM, Lyle Tuttle <
l.tuttle@cox.net> wrote:
> At 10:36 AM 12/21/2011, Dazed_75 wrote:
>
> The manufacturer states rather strongly that unplugging the UPS is a BAD
> way to test it since that also removes the ground circuit. So far, my best
> idea is to go out to the electrical box and flip the relevant circuit
> breaker off.
>
> The point though, is even that only tests the UPS. I would need to leave
> it off long enough for the UPS to request (via that USB cable) that the
> computer do an orderly shutdown which could take 30 minutes or more.
>
>
> Whoa!
>
> My understanding is that when a power failure occurs, the UPS takes over
> supplying power immediately - and also signals the system to shut down in
> an orderly fashion....the 30 minutes you mention, IMHO, deals with the
> amount of time the UPS would run the system if it did not shut down
>
Good point although I don't think it should immediately tell the computer
to shut down either. What the manual says is "can connect your UPS to a
computer in order to automatically save open files and shut down the
computer if it is left unattended *during an extended power failure*"
(emphasis added). This makes me think the notification would be issued by
the UPS after battery power dropped to some level or estimated time
remaining since the OS would have no clue how much battery time remained.
> - on my system, by utilizing various power outlets on the UPS, I can
> somewhat control WHAT components shut down right away.
>
> *What if you plug the UPS into a switchable power strip - then turn it
> off?
> *
>
Another good point, that should retain the ground connection. Eric made
the same suggestion.
> *
> *
>
> And worse, I would not know if a non-event meant a failure on the part of
> the UPS signaling system or the Linux side not making use of the signal
> event since I still have no idea what to check for.
>
> I bring all this up because my last UPS failed to protect the computer so
> now I am paranoid about it.
>
> On Wed, Dec 21, 2011 at 8:27 AM, Alex Dean <alex@crackpot.org> wrote:
>
> On Dec 21, 2011, at 2:06 AM, Dazed_75 wrote:
>
> > I just put in a replacement UPS (Tripp-Lite G1010USB) and connected the
> USB cable. I see that Ubuntu 10.04 does see it but I have no idea how to
> tell if it will actually pay attention if the UPS ever tells it to shut
> down. Short of a power failure, how can one know?
>
> Unplug the UPS from the wall?
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> Dazed_75 a.k.a. Larry
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