[rrd-users] Selecting a Particular RRA

[Tarus Balog]

If I want to store five minute samples (a step of 300) for a month,  
and the hourly average, min and max for 366 days, I can use the  
following RRAs:

RRA:AVERAGE:0.5:1:8928
RRA:AVERAGE:0.5:12:8784
RRA:MIN:0.5:12:8784
RRA:MAX:0.5:12:8784

If I use a DEF to access the collected data, is there a way to  
request the second RRA for average versus the first? In other words,  
suppose I request an average value for the month of December. It  
appears that RRDTool will use the highly granular data from the first  
RRA. If I were to request the same average 30 days from now, it would  
be slightly different, since the values would only exist in the  
second RRA and they are less granular.

Since I am only storing one value in the first RRA, I guess I could  
use LAST, MIN or MAX and avoid the confusion with AVERAGE, but that  
would introduce a new set of problems for me (sigh).

Any help would be appreciated, and I hope I've explained my question  
sufficiently. Please feel free to point me at a URL or FAQ if I  
missed it in my research.

-T


-----

Tarus Balog
The OpenNMS Group, Inc.
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