Hi,

i tried "-s" trick and i also checked the man of rrdcreation which made a reference of your suggestion:

--step|-s step (default: 300 seconds) Specifies the base interval in seconds with which data will be fed into the RRD.

i tried to add both in rrddefinitions.cfg :

[httpd_threads/15] --step 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

or

[httpd_threads/15] - 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

But it doesn't change anything, the RRD file is still created with 300.

What s wrong ?

Cheers Nico

Le 8 févr. 2013 à 14:57, Nico <nicolas at lienard.name> a écrit :

Hi

Thanks for answer.

I updated the rrddefinitons.cfg with your recommandations :

[httpd_threads/15] -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

Then i restarted xymon server (it is needed ? in doubt i did it).

I also deleted the previous RRD file to see how is created a fresh one after the modification:

<?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>1360331300</lastupdate> <!-- 2013-02-08 14:48:20 CET -->

    <ds>
            <name> threads </name>
            <type> GAUGE </type>
            <minimal_heartbeat>5</minimal_heartbeat>
            <min>NaN</min>
            <max>NaN</max>

            <!-- PDP Status -->
            <last_ds>32</last_ds>
            <value>3.1000000000e+03</value>
            <unknown_sec> 105 </unknown_sec>
    </ds>

Unfortunately, it is still a step of 300.

What did i miss ?

Thanks again.

Cheers Nico

Le 8 févr. 2013 à 14:19, Michael Beatty <Michael.Beatty at sherwin.com> a écrit :

...

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

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