The RRDTool PDP (primary data points) are formed after Normalisation.

The Normalisation process adjusts the data back in time to a Step boundary -- 
IE, if step is 's' and time is 't', then 
( t mod s ) = 0

So, whatever time you submit your sample at, if your step is 5 then the PDP 
time will be a multiple of 5 (seconds since the Epoch).

Understanding Data Normalisation is a bit more of a job and I can recommend 
this tutorial -
http://www.vandenbogaerdt.nl/rrdtool/process.php

Steve

Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
[email protected]
Ph: +64 9 373 7599 ext 86487



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