[Nut-upsuser] UPS shutdown - always the thing to do?

Whit Blauvelt whit+nut at transpect.com
Tue Nov 20 12:05:49 UTC 2007

On Tue, Nov 20, 2007 at 09:31:59AM +0100, Arjen de Korte wrote:

> The best answer we can offer here, is to just try it out on your specific
> kind of hardware. The proof of the pudding is in the eating.

Of course. The shortcoming being that running the UPS down that far would
take a few hours - at which point I start thinking asking around might be
more efficient use of time, just in case somebody knows, since really
proving the pudding might take multiple cycles of full discharge-recharge,
plus it's production equipment hanging on it I don't want to keep shutting

> The documentation does cover this. See 'docs/shutdown.txt' which describes
> exactly the problem you're picturing (under 'Power races') and also shows
> a way how to test if you're vulnerable to this kind of problem (under
> 'Testing power races').

Thanks. I was assuming the fullest docs were also on the Website; guess not. 

To another reply - it's the "cyberpower" driver that works with the 1500AVR.
(The more modern driver skews the values badly. I requested the right
conversions from the manufacturer, but the rep who responded regretted that
he couldn't get the tech staff to reveal those.) 

Am I right that on average, presuming a professional-level UPS (this
sucker at least is a rack-mount with a few hours of battery in it), and
with PCs with bioses which will can be set to boot on any fresh power
application, that I'm better off without sending "shutdown" to the UPS?


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