[mrtg] Re: Not getting monthly and annual graphs (RRD question)

[Alex van den Bogaerdt]

Dan Colquhoun wrote:
> 
> Can you please explain how I'm storing only 6 days worth of data in
> half-hour intervals?  I think this is what I'm not understanding.  If I have
> 336 half-hour average sample points, that's 168 hours total, which is 7
> days.  How do you get 6?  In the tutorial it says "the most recent data will

Typo?  Or just a miscalculation.  I seriously can't remember.


> be near "now" and therefore we will need to keep more data than MRTG does."

(numbers are not exactly correct but to show what's happening)
MRTG:
600 5-minute averages: now to now-3000 minutes
600 30-minute averages: now-3000 minutes to now-21000 minutes

RRDtool:
600 5-minute averages: now to now-3000 minutes
700 30-minute averages: now to now-21000 minutes

The period covered by the 5-minute averages makes the difference.

> Also, how can I make sure the correct RRA is being used for each graph?
> Right now I have my monthly graph using daily average values as opposed to
> the half hour values I want it to use.

Make sure the area you graph is completely covered by the RRA that
should be selected.  If it doesn't, the next best RRA is choosen.

Experiment a bit.  Use rrdtool fetch to do so.

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