[xymon] Possible to sum rrd into one graph ?

[Ralph Mitchell]

If you're using DEFs like this:

      [la]
           TITLE CPU Load
           YAXIS Load
           DEF:avg=la.rrd:la:AVERAGE
           CDEF:la=avg,100,/

you can definitely use a pathname for the RRD.  I do exactly that with some
performance graphs where I can't use xymon:

     DEF:server1avg=/var/lib/perfmon/server1/loadavg.rrd
     DEF:server2avg=/var/lib/perfmon/server2/loadavg.rrd

I don't know if the same is true of the FNPATTERN style of setting DEFs.

Of course, if your RRD are on different physical machines, that's a bit
harder...  :)

Ralph Mitchell


On Fri, Aug 27, 2010 at 7:34 AM, SEGLARD, Thomas <tseglard at tf1.fr> wrote:

>  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:ralphmitchell at gmail.com]
> *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 <tseglard at tf1.fr> 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:josh at imaginenetworksllc.com]
> *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" <tseglard at tf1.fr> 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
>
>
>
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