[rrd-developers] Re: Creating a rrdtool alter command

Tobias Oetiker oetiker at ee.ethz.ch
Thu Mar 11 07:38:38 MET 2004

Yesterday Igor Sfiligoi wrote:

> Hi Jake.
> As I have said in the beginning, this is just a first step.
> I need to add the other functionality.
> Right now I am working on the 1.0.x version, but plan to port it to 1.1.x.
> BTW, nobody has any suggestion on my original question?
> ---------------------
> Adding a RRA is instead a little more tricky and I would like to have some
> feedback.
> I see essentially 2 problems:
> 1) When I have already several RRAs with the same consolidation function,
> which one should I use?
> The most obvious idea seems to be the use of the most fine grained when
> possible and going on to the next grain only when needed.
> Do you agree?

yes exactly ...

> 2) What should I do when a completly new consolidation function is requested?
> I see two options here:
> 2a) leave all values UNKN
> 2b) get the values of another consolidation function

you can do b) at least partly if  you have an RRA at STEP interval
a number of consolidation functions will store the base values
there (at least AVG, MAX, MIN will) so you can use this as input
for the new consolidation function ... otherwhise certainly it
should be UNKN ...

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