RRD Graphing configuration

Bill Richardson wrichardson at llbean.com
Mon Aug 11 15:53:56 CEST 2008

I have looked high and low for a way to change how custom rrd's are
created in hobbit.
I have created a custom script to graph and have 2 problems that I would
like to figure out.
1.) I would like to change the step from 300 secs to 60 secs in the
rrd's and run the script ever 60 secs instead of 300 secs. "The default
rrd behavior is set to 300 secs"
2.) I would like to get the true values not average. The problem is I
have data that I want to graph that can range from 0 to 5  "thats 0, 1,
2, 3, 4  or 5" and the graph shows average so my graphs come out with
numbers like 6m "6 milli" for a true value of 2 and so on. The problem
is the data will sit a 0 for an hour or more and then go to 1 or 2 for
just one sample. Average is not the right choice and I cant get the true
figures I 'm looking for.
 Seems like the way to do this is in the hobbitserver.cfg. I added the
following to the hobbitserver.cfg
What other values can you pass to rrd other than GAUGE? Can I set a step
to say 60 instead or 300 and can I change the default behavior of
AVERAGE to something else that may work for my above example? The rrd
docs are not clear on this.

Early on I was thinking that maybe I could fix the AVERAGE problem with
a change to the hobbitgraph.cfg but this is what I found:
The hobbitgraph.cfg does not have any effect on how rrd file is created.
I deleted the testgraph.rrd made the changes to hobbitgraph.cfg and no
go. You cant see the graphs if you use anything but AVERAGE after
changing the hobbitgraph.cfg. It looks like the *.rrd's are created by
default "AVERAGE" and you just edit the hobbitgraph.cfg to view whats
already built. I need to figure out how to change the way the rrd's are
built and its not thru the hobbitgraph.cfg.
BTW here is the output from rrdtool dump see attached. 
You will see two areas that need to be changed "the step 300 and
<!-- Round Robin Database Dump --><rrd> <version> 0003 </version>

<step> 300 </step> <!-- Seconds -->


<!-- Round Robin Archives --> <rra>

<cf> AVERAGE </cf>

Thanks for any clues... : )
Bill Richardson
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