[Xymon] Custom step and heartbeats. The rrddefinitions.cfg

[Thomas Hawkins]

Hello All,
Never got a response to this, not sure if anyone has anything to add for
the list archive regarding the rrddefinitions.cfg file.

I can confirm that after running the commands:
/usr/local/rrdtool/bin/rrdtool tune
/home/xymon/data/rrd/{servername}/db-sizes.rrd -h DBProd:1000 -h
DBLogging:1000 -h DBLOR:1000 -h DBReporting:1000 -h DBSIS:1000

/usr/local/rrdtool/bin/rrdtool tune
/home/xymon/data/rrd/{servername}/ldf-sizes.rrd -h DBProd:1000 -h
DBLogging:1000 -h DBLOR:1000 -h DBReporting:1000 -h DBSIS:1000

I started getting data from my 15 minute test.

Thomas


On Thu, Nov 1, 2012 at 11:07 AM, Thomas Hawkins <cornmaster at gmail.com>wrote:

> I created a test that reports back some file sizes from a Windows server.
>  The files don't change much, so I set the test to run every 15 minutes.
>
> My rrd file has all NaN, even though I confirmed the data is reported
> using the lastupdate command in rrdtool.
>
> I understand that this is because the default step/heartbeat are
> configured for a 5 minute window of checks, and my 15 minute checkins fall
> outside of this range, and therefore aren't added to the file.
>
> These are my assumptions thus far, and if they are wrong, please correct
> me.
>
> So what I did was use rrdtool tune command to change the heartbeat of my 5
> data types to 1000 seconds.  Which should allow my 15 minute updates to get
> logged correctly.  Not sure if that has worked yet, hasn't been 15 minutes.
>  But I wanted to ask about the rrddefinitions.cfg file.
>
> I understand that I can change the step/heartbeat settings on RRD file
> creation using this file.  But I can't understand part of the config.  Here
> is the contents of that file:
>         # 576 datapoints w/ 5 minute interval = 48 hours @ 5 min avg.
>         RRA:AVERAGE:0.5:1:576
>         # 576 datapoints w/ 6*5 minute averaged = 12 days @ 30 min avg.
>         RRA:AVERAGE:0.5:6:576
>         # 576 datapoints w/ 24*5 minute averaged = 48 days @ 2 hour avg.
>         RRA:AVERAGE:0.5:24:576
>         # 576 datapoints w/ 288*5 minute averaged = 576 days @ 1 day avg.
>         RRA:AVERAGE:0.5:288:576
>
> I won't say I understand it all, but this is what I have deduced so far:
> - RRA:AVERAGE: - needs to be there.
> - 0.5: - Don't know what this is for.  I assume it have something to do
> with the span of the step/heartbeat.
> - 1: or 6: or 24: etc... - The number of datapoints collected per graph
> interval.
> - 576 - The total datapoints saved.
>
> Can anyone provide some insight into this file?
>
> Thanks,
> Thomas
>
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