[rrd-users] Using a windowed counter

[Donovan Baarda]

Uh... my bad, I miss-read the details. You are right, it's a rainfall per
hour rate.

I think a pre-filter script to convert your hourly rate back into a counter
before feeding it to rrd would be the best option. A little python
scripting would probably do it pretty easily.

On 14 June 2017 at 09:07, Alex van den Bogaerdt <alex at vandenbogaerdt.nl>
wrote:

> > A far simpler solution is; it's just a counter that resets every hour.
>
> No it's not.
>
> >> > 011111244445678888889998767777765555553444335888889899987677
> >> > 010000120001121000121000012000110000010100012300011010001210
>                   ------------
>                    ------------
>
> Look approximately halfway:  98767
> Then look below: 00012
>
> The "counter" goes from 7 to 6, as a result of rainfall 1 being added and
> 2 being removed from the window.
>
> If you treat this as a counter being reset every hour, you would get
> negative rainfall, or counter overflow with the resulting huge flood, or
> rates becoming unknown because of sanity checks.
>
>
>
>
>
>


-- 
Donovan Baarda <abo at minkirri.apana.org.au>
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