Possible to sum rrd into one graph ?

Take a look at the man page for rrdgraph_data.  That describes how to use
CDEF:

     CDEF
         CDEF:vname=RPN expression

         This command creates a new set of data points (in memory only, not
in
         the RRD file) out of one or more other data series.

After using DEF to define the variables being pulled from the various RRDs,
you should be able to combine them with a math expression.  You would then
use the CDEF vname in the graph LINE, AREA, etc.

Ralph Mitchell

On Fri, Aug 27, 2010 at 3:56 AM, SEGLARD, Thomas <user-befbea81d840@xymon.invalid> wrote:

 Hi Josh,


First, thank you for this link. Second, I’m sorry but I don’t understand
very well your example. I don’t want to graph multiple RRD sources, I want
to graph the sum of multiple RRD sources J Do you think Xymon could make
it ?


Thanks for help.


Thomas


*De :* Josh Luthman [mailto:user-4c45a83f15cb@xymon.invalid]
*Envoyé :* jeudi 26 août 2010 17:20

*À :* xymon at xymon.com
*Objet :* Re: [xymon] Possible to sum rrd into one graph ?


https://sourceforge.net/apps/mediawiki/xymon/index.php?title=Graph_multiple_RRD_sources

On Aug 26, 2010 8:04 AM, "SEGLARD, Thomas" <user-befbea81d840@xymon.invalid> wrote:

Hello,


In Munin, its possible to sum several rrd into one graph (ie : to display
the total bandwidth used by all your media servers). Thus, I’m asking if
it’s possible to do this in XYmon too ? I saw the « Metrics reports » but
you can’t sum graphs…

Regards,


Thomas SEGLARD