[rrd-users] Question about PDPs

Simon Hobson linux at thehobsons.co.uk
Tue Jun 29 10:12:37 CEST 2010

Stevens, Weston J wrote:

>So how does this work. Say you have a step of 15 seconds for an RRD, 
>and you're updating the RRD at 5 second intervals. Does this mean 
>the PDP is the average of those 3 points, and just like a CDP it is 
>an averaged data point?

Yes, RRD tool accumulates the data you enter until it has a full step 
period - and then it normalises what it has. So yes, in your 
scenario, each primary data point is itself an average of the three 
values entered.

Alex has some good tutorials at http://www.vandenbogaerdt.nl/rrdtool/ 
- note in particular the one on normalisation.
Simon Hobson

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