[rrd-users] Re: interpretation of rrd creation

[Serge Maandag]

> RRA:AVERAGE:0.3:288:1461
> (RRA:CF:xff:step:rows)
> what is 0.3 representing here?

Your RRA holds 1461 samples, each sample calculated by taking the average of 288 consecutive inputted values.
If more than 30% (0.3 x 100%) of those 288 values are the unknown, the sample becomes unknown.
Otherwise the sample becomes the average of all known values of the 288 values.

> -------------------------------------------
> rrdtool create target.rrd
> --start 1023654125
> --step 10
> DS:mem:GAUGE:300:0:671744
> RRA:AVERAGE:0:1:288
> RRA:AVERAGE:0.3:6:1440
> RRA:AVERAGE:0.3:72:1460
> RRA:AVERAGE:0.3:288:1461
> ---------------------------------------------
> 
> RRA:AVERAGE:0:1:288
> my interpretation::
>    the data will be saved every 10 seconds for 288 rows, 
> which means the graph is saved for  (288*10) / (60sec/min) = 48 mins.

Correct.
and

> RRA:AVERAGE:0.3:6:1440

holds 6 x 1440 x 10 / 3600 = 24 hours of data in 1 minute samples.

Serge.

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