[rrd-users] Re: Choosing which RRA to graph

[Alex van den Bogaerdt]

> > My RRD contains RRAs for averages and maxima (over identical time
> > periods), but I'm unsure how rrdtool graph picks which one to draw.  At
> > first I thought the CF parameter to rrdtool graph determined which RRA to
> > use, but on closer reading of the man page:
> > 
> > "The DEF call automatically chooses an RRA which provides data in a
> > resolution appropriate... If the resolution of the RRA is higher ... the
> > data ... will be consolidated according to the consolidation function
> > chosen"
> > 
These are two different things.

The CF parameter determines, for instance, AVERAGE and MAX.
The data resolution has to do with the time range per RRA entry.

RRA0-avg RRA0-max  "daily"
RRA1-avg RRA1-max  "weekly"
RRA2-avg RRA2-max  "monthly"
RRA3-avg RRA3-max  "yearly"

"the DEF call automatically...." will choose RRA 0,1,2 or 3/
"...according to the consolidation..."  will choose avg or max.

HTH
Alex

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