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

Steve Shipway s.shipway at auckland.ac.nz
Thu Apr 12 01:26:35 CEST 2012

You can do this using a CDEF.

What to graph depends on your preference.  If you want to mimic the behaviour of native-mode MRTG, for example, which uses the previous known value to replace a NaN, then just use something like:


(IF value of x is unknown, use PREVious value of cleanx, else use x)


Steve Shipway
ITS Unix Services Design Lead
University of Auckland, New Zealand
Floor 1, 58 Symonds Street, Auckland
Phone: +64 (0)9 3737599 ext 86487
DDI: +64 (0)9 924 6487
Mobile: +64 (0)21 753 189
Email: s.shipway at auckland.ac.nz
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