[rrd-users] Re: Excluding UNKN or NAN from CDEF

Stephan Harren sh at abovenet.de
Mon Sep 27 18:03:09 MEST 2004

Hi Alex,

yes you're right, but in this case, 1,0,0,unknown will result in 33% as 
the calculation is made like:

count all values > -1
add all values

divide counted/added


which means, when counting, nans are ignored, when adding nans are 
ignored so you'll find 1/3. But I hope that this is exactly what Eric 
wants to achieve.



>AFAIK unknowns are ignored when averaging.
>In other words: 1,1,1,unknown,1 will result in 100%,  1,0,0,unknown
>will result in 25%
>Easy to check, when you run a script on a database with known content.
>Just build a test-rrd, put some data in it and create some graphs.

Stephan Harren
Head of Engineering
AboveNet Deutschland GmbH
Phone +49 69 90554 153
Fax +49 69 90554 111
Cell +49 173 7011126

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