[rrd-developers] Re: Feater Request: RPN operator => RRD

[Mark Lawrence]

> you can do this in CDEF by testing for unknown and putting 0 or 1 then 
> you SUM the result to get the known vs unkonwn ration for the data you 
> look at ...

This doesn't work with consolidated data. Imagine 3 out of 5 data points 
with UNKN values and you are working with an RRA that has consolidated 
all five points - usually into a single UNKN value. You have "lost" the 
values of the two known data points.

>> 3. a new Function SUM like TREND but sums all values instead of building
>> an average.
>>
>> My favorite would be the third one.

This would also be my preferred solution.

Cheers,
Mark.
-- 
Mark Lawrence

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