On Monday 13 January 2020 22:31:55 Charles Lepple wrote: > On Jan 12, 2020, at 12:58 PM, Gene Heskett wrote: > > But this doesn't pass the smell test, 3 other machines that are > > trained to reboot when power returns and have no ups fitted, were > > NOT rebooted as evidenced by their reported uptimes, one of which > > shows a 144 day uptime. So why should this have been logged via a > > -wall bc to every login it is servicing? > > > > There was no power failure IOW. > > The thing is that many UPS models will report "on battery" when the > voltage fluctuates out of range, but a switching power supply might > still be able to coast through it-- especially if the supply is > oversized for the load at the time of the abnormality.
Oversized is hereby nominated for understatement of the week, if not longer. Before I inserted the ups, flipping the power switch took all of 10 seconds to kill the red led on the pi4. So at a 5 amp rating, I'd say it was a wee tiny bit oversized. Now I'd expect days if the battery is somewhere near fresh. :-) > Since both "outages" (really, the on-battery states) were exactly 10 > seconds long means that the UPS was probably trying to "debounce" the > voltage fluctuation by not switching back to line power immediately > after the voltage went back to normal. Well. since the weather was heavily wet and slightly "noisy" at the time, a couple nearby strikes might have bumped it I suppose, but a semi-stock old dell wasn't disturbed, and 2 intel shoeboxes with D-525-MW mobo's also survived whatever it was. They are subject to wall power floobydust. Wall power has improved some since several have installed standy's. I doubt if that's a co-inky-dance since those easily visible ones are an embarrassment to the power peddlers. > For APCs and MGEs, I think it is typically 5 seconds. > > Several people have rigged up longer timers with upssched to not send > the wall message until it has been on battery for, say, a full minute. I'd still like an interpretation of that log, I stopped it when it was obviously looping at about 2 second intervals. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Nut-upsuser mailing list [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
