[rrd-users] Re: Data differ from RRA to RRA - normal?

Alex van den Bogaerdt alex at ergens.op.het.net
Fri Oct 13 03:37:00 MEST 2006

On Thu, Oct 12, 2006 at 10:06:14PM +0200, Inno wrote:

> # Tobias Oetiker schrieb:
> > last will return the last value entered into an rra since the rras
> > have different resolution the data is bound to be different ...
> Even different resolutions should return equal values for the same time
> range,  or shouldn't they?

Did you really use the "LAST" consolidation function and then
apply "AVERAGE" over it ?!?

if so:

One RRA taking 3 PDPs per CDP:
AVERAGE(LAST(3,6,2),LAST(1,2,3)) == 2.5

One RRA taking 6 PDPs per CDP:
AVERAGE(LAST(3,6,2,1,2,3)) == 3.0

here's your difference.

Alex van den Bogaerdt

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