[rrd-users] Re: Overlapping RRAs

[Alex van den Bogaerdt]

On Tue, Feb 24, 2004 at 04:07:52PM +0100, Serge Maandag wrote:
> > rrdtool create test.rrd
> > 	DS:myvalues:COUNTER:600:U:U
> > 	RRA:AVERAGE:0.5:1:27360		## 95 days
> >         RRA:AVERAGE:0.5:6:336		## 7 days
> >         RRA:AVERAGE:0.5:24:372		## 31 days
> >         RRA:AVERAGE:0.5:288:365		## 365 days
> > 
> > If I should draw a graph for the past 90 days, which RRA will 
> > it use and why ?
> > It looks to me like it's using the last one (365 days).
> 
> Logically it should pick the first one. I've seen it fail before though.
> Your 2nd and 3rd rra are redundant. They will never be used.

Please, I have no time to explain but this statement is false.
Browse the archives for previous explanations.

In short:  graphing 300 pixels horizontally may very well be
done using the 2nd, 3rd or 4th RRA.

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