[rrd-users] rrd graph inter/extrapolation of large U / NaN blocks

[Steve Shipway]

> Using PREV gave the following;
> ERROR: rpn expressions without DEF or CDEF variables are not supported

I'm not sure why that should be; I'd need to see the exact CDEF you used to verify.  Here is code from my system that definitely works:

DEF:in=/u01/rrddata/ace_gi9_45.rrd:ds0:AVERAGE:daemon=unix\:/var/tmp/rrdcached.sock
CDEF:unpin=in,UN,PREV,in,IF
CDEF:fin=unpin,8,*
AREA:fin#00cc00:Incoming traffic

This makes the 'unpin' CDEF be the 'in' value, but extending the last known value horizontally over unknown areas.  
Possibly using PREV rather than PREV(in) avoids the message, or else we have different versions of rrdtool...

Steve

Steve Shipway
ITS Unix Services Design Lead
University of Auckland, New Zealand
Floor 1, 58 Symonds Street, Auckland
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Email: s.shipway at auckland.ac.nz
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