[rrd-users] Consolidation Factors and Steps

[Gellatly, Laurie]

Hi,
I'd like to make sure I have the correct understanding of 
Consolidation Factors and Steps.
>From the manual:
rrdtool create ... [--step|-s step] ... [ RRA: CF:xff:steps:rows]
Please note there is a "step" value and "steps" as well and I
talk about both below.

If I have an RRA that has a steps value of 1 then I believe that
this means that every point that is entered into the rrd should 
end up in this RRA. As another way of looking at this, if I 
enter 3 values over step/3 intervals with a CF of Average, 
then does this actually average the values being entered into 
the RRA? I'd assumed that the CF does not get considered
when "steps" was 1?

If my assumption is correct that "steps" = 1 means actual 
data points entered (time period adjusted if needed), then 
the CF is not relevant in this case. This leads me to 
believe that keeping more than 1 RRA with different CFs 
and all with steps=1 is a waste. A change to rrd_fetch 
would allow any CF with steps=1 to be returned if the 
interval requested was "acceptable".

Comments?

Thanks			...Laurie :{)


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