[Xymon] rrddefinitons.cfg - how to modify the default step in RRA

[Michael Beatty]

The 5 in your DS is your heartbeat, not step.

Put a -s parameter in rrddefinitions.cfg  ie:

[httpd_treads/5]
     -s 5
RRA:AVERAGE:0.5:60:576
        RRA:AVERAGE:0.5:360:576
        RRA:AVERAGE:0.5:1440:576
        RRA:AVERAGE:0.5:17280:576


This will change your step to 5 seconds.  Note, that you will probably 
want to change your heartbeat to a value greater than your step.  By 
setting your heartbeat = step, you are running a probable scenario of 
missing data.  Your heartbeat should be greater than your step, I'd 
recommend double, if not triple.

Both step and heartbeat are set when the rrd file is created, you cannot 
change them on the fly.  If you do not wish to lose existing data, you 
will need to run "rrdtool tune -h threads:10" to change your 
heartbeat.   Then, you will need to dump your rrd to a file, edit the 
xml step with a text editor, then restore your rrd from the edited xml,

rrdtool dump httpd_threads.rrd > threads.xml
edit the threads.xml setting step to 5
rrdtool restore threads.xml httpd_threads.rrd

If you plan on doing this on several hosts, or plan on doing it 
frequently, I suggest you write a script and utilize the xymon grep 
utility.... it will make your life considerably easier.



Michael Beatty
Sherwin-Williams
IT Analyst/Developer
michael.beatty at sherwin.com
216-515-7374

On 02/07/2013 02:59 PM, Nico wrote:
> Hi
>
> I need to do a temporarily graph with a very low frequency : 5 seconds 
> instead of the regular 300 seconds.
>
> 1/ On client side, the external script is simple:
>
> [ buda ext]# cat httpd_threads.sh
> #!/bin/bash
> THREADS_HTTP=`ps -ef | grep -c [h]ttpd`
> LINE="data $MACHINE.trends
> [httpd_threads.rrd]
> DS:threads:GAUGE:5:U:U $THREADS_HTTP"
> $BB $BBDISP "$LINE"
>
> So, as you can see, the step is 5 in the DS.
>
> clientlaunch.cfg has "INTERVAL 5s".
>
> 2/ On Xymon server side :
>
> rrddefinitions.cfg  :
>
> # step = 5 seconds
> [httpd_threads/5]
>         # 576 * 60 * 5 sec = 48 h soit 2 jours sans perte
>         RRA:AVERAGE:0.5:60:576
>         RRA:AVERAGE:0.5:360:576
>         RRA:AVERAGE:0.5:1440:576
>         RRA:AVERAGE:0.5:17280:576
>
>
> # This one is the default setup. You can change it, if you like.
> []
>         # 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
>
>
>
> 3/ RRD created:
>
> here the issue, the step is still 300. The minimal_heartbeat is 5.
>
> rrdtool dump httpd_threads.rrd
>
>
> <?xml version="1.0" encoding="utf-8"?>
> <!DOCTYPE rrd SYSTEM "http://oss.oetiker.ch/rrdtool/rrdtool.dtd">
> <!-- Round Robin Database Dump -->
> <rrd>
>         <version>0003</version>
>         <step>*300*</step> <!-- Seconds -->
>         <lastupdate>1360264485</lastupdate> <!-- 2013-02-07 20:14:45 
> CET -->
>
>         <ds>
>                 <name> threads </name>
>                 <type> GAUGE </type>
> <minimal_heartbeat>5</minimal_heartbeat
>
> --- snip ---
>
>
> How can i change the step to 5 instead of 300 ?
>
> Thanks for your help.
>
>
> Cheers
> Nico
>
>
>
> _______________________________________________
> Xymon mailing list
> Xymon at xymon.com
> http://lists.xymon.com/mailman/listinfo/xymon


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