Calculations of RRD data

[Jim Avery]

On 9 August 2010 16:39, Stephen H. Dawson <service at shdawson.com> wrote:
> Yes, we use DRRAW as well.  However, running those cal's, and then graphing
> within Nagios or DRRAW or pnp4nagios would be nice.
>
> I guess it is an export from RRD, do the calc's, and review outside of
> Nagios/DRRAW/pnp4nagios kind of thing?


It depends what you want do do.

I do a lot of simple maths using DRRAW in the CDEF field for each data
source or by adding CDEF lines.  Don't forget you can hide datasources
by setting "-Nothing-" for the line/area type so you can just display
the results not the original data.

For some things where drraw can't quite cut it, I use rrdgraph outside
of DRRAW (typically I use rrdcgi so I can easily publish to the web).
See: http://oss.oetiker.ch/rrdtool/doc/rrdcgi.en.html

I only bother exporting to .xml and import to Excel when I want to do
really fancy scatter graphs and regression analysis.


If you're going to want the performance data in a database all the
time, you might consider changing your Nagios perfdata processing
config to output the data to MySQL or whatever instead of or as well
as to PNP.


Cheers,

Jim

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