[rrd-users] HELP I dont understand RRA's

[tony at specialistdevelopment.com]

Hi Guys,

I have realized i am just incredibly thick, even with your help to try  
and get me to understand.

No i understand what the PDP's CDP's etc mean, but cant get my head  
around how to calculate the values..

So in a last ditch effort to "get" it here is my example with my  
workings, can you guys take a look and see im sort of on the right  
track?

So i want to graph my network traffic. i want to read the data every  
minute so my step is 60 seconds, also wait 120 seconds before unknown.

RRA 1 - 60 PDP's, so every minute, then create 1 CDP for an hours info.
RRA 2 - 60 PDP's make 24 CDP's for a days info.
RRA 3 - 1440 PDP's make 31 CDP's for a months info.

rrdtool create network.rrd \
   --start N \
   --step 60 \
   DS:bytesIn:DERIVE:120:U:U \
   DS:bytesOut:DERIVE:120:U:U \
   RRA:AVERAGE:0.5:60:60 \
   RRA:AVERAGE:0.5:60:24 \
   RRA:AVERAGE:0.5:1440:31

Or have i got my numbers totally wrong?

Tony


Quoting tony at specialistdevelopment.com:

> Hi Guys,
>
> Im really sorry to ask this as im probably being very stupid...Im new
> to RRD tool and think it is amazing, im trying to write a set of Perl
> scripts to monitor my traffic in and out...
>
> I have followed tutorials, examples etc, but to finally get my head
> around it im trying to do it on my own, but i come unstuck, when it
> comes to RRA's in the RRD creation.
>
> Can anyone explain in really, really simple terms what they are?
>
> Thanks for any replies I get.
>
> Tony
>
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