[rrd-users] rddtool clarification

Emily Chouinard cousin17 at msu.edu
Mon Jun 30 14:57:42 CEST 2008

I've been working with rrdtool for awhile now, I've read over the 
tutorials, the documentation and the list-serve archive and I still have 
a few questions I can't seem to answer myself so if anyone can offer a 
suitable answer I would really appreciate it.

One of the concerns of my supervisor deals with timestamped data: if I 
create an rrd with --step 10 and heartbeat 60, it takes atleast 6 PDPs 
and averages them into 1 CDP (assuming proper rows and steps) but what 
data gets time stamped? And how is this average taken(for counter and 
derive DST) over these 6 values?

This is what I believe happens but I'm not sure, the 6 values come in 
and when the average is taken that CDP is timestamped with the time the 
average was calculated?
 For the second part, I know that is there is two PDP the difference 
between them is calculated and then the average is the diff/step, but 
how does that work for 6 values?

I just want to make sure that actually understand what I read, and if 
someone can help me clarify a few hazy areas I would really appreciate it.

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