[rrd-users] convert rrd into new rrd with different RRAs

[Tobias Oetiker]

Hi Stefan,

there is no such program to that does this as fahr as I can tell
... the simples way to achieve this is to write an app that pulls
the data from the original rrd, sorting the updates by time picking
the higest resolution available for each instant and then feeding
it back to a newly setup rrd ... it will get trickier if you want
to support MAX RRAs as well, but you get the idea ?

cheers
tobi

Today Stefan M. Brandl wrote:

> On Mon, Mar 23, 2009 at 07:32:07PM +0100, Karl Fischer wrote:
> > Hi,
> >
>
> Hello Karl,
>
> > I'm re-posting this since I didn't get a single reply - any ideas?
> >
> > I'm trying to convert many existing rrds into new rrds with different RRAs.
> >
> > so for example I might have rrd's created with:
> > (RRAs: 1s, 10s, 60s, 600s)
> >
> >   --step=1
> >   DS:somevalue:GAUGE:120:0:U
> >   RRA:AVERAGE:0.5:1:3600    # 1s for 1h
> >   RRA:AVERAGE:0.5:10:8640   # 10s for 1d
> >   RRA:AVERAGE:0.5:60:10080  # 60s for 1w
> >   RRA:AVERAGE:0.5:600:4320  # 10m for 1m
> >
> > and I'd like to convert this into a new rdd that looks like this:
> > (RRAs: 2s, 10s, 60s, 900s)
> >
> >   --step=2
> >   DS:somevalue:GAUGE:60:0:U
> >   RRA:AVERAGE:0.5:1:5400    # 2s for 3h
> >   RRA:AVERAGE:0.5:10:8640   # 10s for 1d
> >   RRA:AVERAGE:0.5:30:20160  # 60s for 2w
> >   RRA:AVERAGE:0.5:300:12960 # 10m for 3m
> >
> > Of course that means that some data needs to be calculated from higher
> > RRAs, for example:
> >
> > the first half of the 2s RRA in the new database can be taken 1:1 from the
> > 1s RRA of the exiting database by using the CF on two datapoints each time.
> > The second half is more tricky since there is no data in 1s resolution in
> > the first RRD, so the values need to be interpolated from the 10s RRA ...
> >
> > I wonder if I have to re-invent the wheel and to write the required code
> > completely myself or if someone has been there already ... ?
> >
> > Any hints welcome ...
> >
>
> As I did not see any hints to the mailing list, I wanted to
> ask if there are any news on this topic?
>
>
> Stefan
>
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-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900