[rrd-users] Questions about different RRA`s

[Ryan Steele]

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 Administrator            
AgoraNet, Inc.