# [rrd-users] Questions about different RRA`s

David Schulz mailinglists at tca-cable-connector.com
Fri Apr 6 04:12:59 CEST 2007

```Yes ive seen Cacti, its nice. The whole idea for me though is to
actually learn how the rrd thing works, so i am not limited to a
front-end.

Thanks a lot,
David

On Apr 5, 2007, at 10:08 PM, Ryan Steele wrote:

> David,
>
> Just my two cents - check out Cacti.  It comes with lots of pre-
> loaded RRD/RRA definitions, among them being the process counts.
> Of all the frontends to RRDTool, I prefer Cacti over Munin,
> Cricket, MRTG, and the like.  The documentation is a bit less than
> you'd like, but once you get your head around it it's really a
> dream to work with.
>
> Best,
> Ryan Steele
>
> David Schulz wrote:
>> Hello,
>>
>> since a while i am digging around the Net to become more clear
>> about  rrdtool, but i am not making much progress.
>>
>> My Goal is to graph the Number of Processes on my Server, for the
>> last  hour, day, week, month and year. In the beginning i just
>> made  one big Archive, using
>>
>> Can someone show me how to best create one such .rrd with
>> multiple  RRA`s, explain to me the calculations you made to decide
>> on the  values for the RRA`s? I tried multiple combinations, one -
>>
>> rrdtool create process_count.rrd --step 60 DS:pc:GAUGE:120:0:U
>> RRA:AVERAGE:0.5:1:525960, which is supposed to take one value
>> every  60 seconds, for one year,
>>
>> but it appears it is better to split the different required times
>> into different RRA`s. I have no idea how to calculate this though.
>> My  main Problem is to determine the exact Values for the
>> individual  RRA:AVERAGE:0.5:?:?. I have read that for example this
>>
>> RRA:AVERAGE:0.5:1:60 should be one hour (1*60*60= 3600 seconds),
>> and  RRA:AVERAGE:0.5:60:24 should be 24 hours, but how about a
>> week or a  month for example? Why RRA:AVERAGE:0.5:60:24, and not
>> RRA:AVERAGE: 0.5:24:60, both should equal a week, right?
>>
>>
>> I really need a push in the right direction here.
>> Thanks a lot for any Explanation,
>> David
>>
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>>
>
>
> --
> Ryan Steele                         Systems