[rrd-users] Adding two VDEF values together

Chris Mason chris at netnix.org
Thu Feb 21 09:58:10 CET 2013


I was trying to do something which I thought was fairly simple, but I
keep on getting the following error:

"ERROR: rpn expressions without DEF or CDEF variables are not supported"

In the most simplest form, I am trying to do the following:




So, a VDEF is a set of data and a CDEF is a single value, but a TOTAL
will be a single value?

I am trying to take two totals and add them together - seems fairly
common to want to do this?

I am using RRDTOOL 1.4.7 - is there an easy way to achieve this, can I
put TA and TB in a CDEF before using ADDNAN?

Thanks as always,

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