[rrd-users] Re: Adding RRA's to an existing database

[alex at ergens.op.Het.Net]

Stephen L Johnson wrote:
> 
> I've not found an answer to this question: If possible, how does one add more 
> RRA's to an existing RRD Database.
> 
> At present I have a bunch of databases that only have RRA using the AVERAGE 
> function. I'd like to add MAX, MIN, and LAST RRA's into the database. It's OK 
> to NaN values in the new RRA's. I just want to preserve the existing data in 
> the databases.

You'll have to dump the database, edit the resulting ascii file and then
restore the database again.  Basically you just make a copy of the RRA
and alter its properties.

Alternatively, you create a program that adds the rra.  This can be a
part of rrdtool; rrdresize is such an addition.

regards,
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