[rrd-users] How To Graph with Occasional NaN (OK)

Patrick Best Patrick.Best at telus.com
Wed Apr 11 16:34:25 CEST 2012

I am very much convinced that a CDEF will allow me to graph a NaN datapoint
using a number from the last-known-good value that we have seen (as defined
by a range, say <50000 ).

I am , however, not an expert on RPN (Reverse Polish Notation).

This seems like a CDEF that many people would like.  Sometimes counters do
not rollover at predictable 32-bit or 64-bit positions, and in my case, a
counter can rollover at any random spot, several times in a day.

I would appreciate some help from the community on coming up with a CDEF how
to present NaN data as a continuation of the same last-known-good datapoint.

Tobi-wan, if you're out there, I could really use your help right now! 


Have a great day!
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