[rrd-users] Re: RRD Archiving (AVERAGE,MIN,MAX,LAST)

[Alex van den Bogaerdt]

On Thu, Aug 07, 2003 at 04:00:45PM -0700, nate wrote:

> rrdtool create filename.rrd --step 300 DS:idle:GAUGE:600:0:100
> RRA:LAST:0.5:1:200000 RRA:MIN:0.5:1:200000 RRA:MAX:0.5:1:200000
> RRA:AVERAGE:0.5:1:200000
> 
> I am interested in storing every data point collected for the
> 200000 cycles, would just making an archive with LAST be sufficient:

Interpolation will kick in, unless your updates *always* happen
on a time equalling n*300.

> rrdtool create filename.rrd --step 300 DS:some_name:GAUGE:600:0:100
> RRA:LAST:0.5:1:200000
> 
> or do I also need archives for MIN MAX and AVERAGE as well? Will
> RRD not be able to calculate averages if I only store the raw data
> points?

If you're going to graph with a resolution of more than 300 seconds
per pixel, RRDtool will do some calculations.

LAST(1,3,2,5,4) == 4
MIN(1,3,2,5,4)  == 1
MAX(1,3,2,5,4)  == 5
AVG(1,3,2,5,4)  == 3

which answer do you want to get if RRDtool consolidates 5 samples
into one at graph time? (rrdtool graph ... --start end-250h ...)

HTH
Alex

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