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

Fri Feb 8 15:22:28 CET 2013

in your rrdef.cfg file, Is your key correct?  Is the column you are 
reporting really [httpd_threads/15]?  This key is what it matches 
against your column.  If your key is [httpd_threads/15] but the column 
is "httpd_threads" (without the "/15"), then the rrd will be created 
with the default "[]" definition.

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

On 02/08/2013 09:06 AM, Nico wrote:
> 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 
> <mailto: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 
>> <mailto: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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>>>> Xymon at xymon.com
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>>>
>>>
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>>
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