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

Stephan Harren sh at abovenet.de
Mon Sep 27 15:48:03 MEST 2004

Hi Eric,

I think, it might be good for you to read the tutorials and manuals 
about rrdtool. But anyways, what do you want to achieve? Showing 
everything allright when there are NaN's? It is not very nice to say: 
"Okay, if I don't know what happened, probably everything was allright.".

But ok, there is one line that defines Cleaned:


This line sets all NaN to 0.0, insert whatever you want instead of the 0.0.



Eric Brander wrote:

>It works very well, except that since this is a new setup, the 
>historical graphs have little data and the SLA line takes the NANs as 
>failures. Again, I've taken this from someone else's example and I must 
>admit that I really don't understand exactly what those statements mean.
>My question to you: Is there a way I can build the SLA line without it 
>incorporating NANs or Unknowns in to its equation?

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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