[kwlug-disc] UPS Power Down Question

[Ron Singh]

>
> I ended up simplifying things, and not worrying about the internet lasting
> for a longer time. That is, the UPS will power the server and shut it down,
> then with UEFI -> Advanced -> APM -> Power On, power should be restored
> after the UPS is back on A/C power and the battery has charged a bit.
>
> [ups1]
>   driver = usbhid-ups
>   port = auto
>   pollonly = "enabled"
>   pollinterval = 15
>
>   desc = "CyberPower UPS"
>
>   ignorelb
>
>   # When A/C power is off, and there are this much seconds remaining
> in the battery,
>   # shutdown the server
>   override.battery.runtime.low=180
>
>   # Delay restoring power to the server, so the batteries have time to
> charge
>   override.ups.delay.start=240
>
> The above says if there are 3 minutes remaining in the battery, then
> shutdown the
> server. Then wait 4 minutes after A/C power is restored before
> providing power to
> the server.
>
> Any concerns?
> Any better ways to do this?
>
>
Only 1 concern -- 3 minutes of remaining batt life is too aggressive I
feel, we use(depending on VA capacity) anywhere from 7 minutes to 9 minutes
to stay within the margin of error for reported remaining battery
life/capacity  of the UPS.
A reported 3 minutes of life is likely as it likely means anywhere from 1
minute to 6 minutes of life depending on the condition of the batteries and
the power requirement of the server during the act of shutting down.
The startup time of 4 minutes is totally good I think; we use 3 minutes. We
are feel assured there is *some* battery life capacity remaining in the UPS
after an orderly shutdown when using a value of 7-9 minutes.
FWIW.

Ron S.
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