[rrd-users] Re: Consolidation Factors and Steps

[Tobias Oetiker]

Today Gellatly, Laurie wrote:

 |
 | 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".

for the current crop of CFs this would be an acceptable
optimization ...

cheers
tobi
 |
 | Comments?
 |
 | Thanks			...Laurie :{)
 |
 |
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