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

[Stanislav Sinyagin]

Hi Igor, 

I have a more-or-less similar idea in mind to create a new tool
within RRFW (rrfw.sf.net). But the approach would be slightly different: 
it would be rather merging tool than altering: you would have several 
datasources from some files or from nothing, and they would serve as data 
for creation of new RRD. Then a single tool would solve many different tasks:

-- joining data from several RRD files into one
-- deleting a DS from RRD file
-- adding a DS to a RRD file

The idea is to use XML export of RRD contents and playing with it by 
a Perl script. Of course, RRAs are better to be the same aggreation 
period and step. If they aren't, it's difficult to say what could be 
a workaround.

Do you intent to write your tool in C with direct access to RRD internals?

I don't have a timeline for this yet, since other quite important tasks 
are in the pipe. 

Regards,
Stanislav

--- Igor Sfiligoi <Igor.Sfiligoi at lnf.infn.it> wrote:
> 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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