Possible to sum rrd into one graph ?

Hello,

 
yes, you're right. 

 
But, my mistake, this is only part of answer and I don't exactly write what I wanted to know. What I want is a way to sum the RRDs from different servers and corresponding to the graph definition « ifstat ». The main problem is that the RRDs are not in the same place/directory and thus I have no way to tell rrdtool where to get these RRDs. This is the main problem and why I required some help J 

 
I could do some scrtipt which sync on a regular basis these RRDs into one server directory. It's not very elegant (but I think this will work !). In a future release, maybe it will be possible to use the Metrics reports to do all the maths we want with different RRDs ? ;) 

 
Nobody uses Xymon to graph the sum of network bandwidth from different sources (firewall, lb, media servers, web servers, etc...) into one graph ??

 
Sincerly,

 
Thomas

 
De : Ralph Mitchell [mailto:user-00a5e44c48c0@xymon.invalid] 
Envoyé : vendredi 27 août 2010 13:04
À : xymon at xymon.com
Objet : Re: [xymon] 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