[rrd-users] A reason there isn't a CF SUM function?

Tobias Oetiker tobi at oetiker.ch
Wed Aug 22 10:51:59 CEST 2012

Today Tobias Oetiker wrote:
> basing a sum on unknown values might be problematic too
>   a + unknown = a
> would mean that you assume that unknown equals 0

mathematically correct would be

   a + unknown = unknown

and this is possible now, if you counfigure your RRAs such that
they require 100% known input value in order to create a known RRA


Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900

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