[rrd-developers] Creating a rrdtool alter command

[Igor Sfiligoi]

Hi.

I am starting to develop an 
rrdtool alter
command.

The idea behind is to allow to add/remove one or more DS/RRA to an existing 
RRD.

Adding a DS is straightforward; it has to be initialized to UNKN.

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?

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

2a seems to be more correct.

What do you think?

Cheers,
  Igor

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