[rrd-users] Python script to add RRA's to an RRD.

[Donovan Baarda]

G'day,

I've seen a few posts asking about how to add an RRA to an RRD without many
decent solutions. Apparently the perl rrd library has something to do this,
but I'm a Python guy so I whipped this up. AFAIK it's the only tool that
populates the new RRA's data from existing RRA's using xport;

http://minkirri.apana.org.au/~abo/projects/rrdcollect/rrdtoolx.py

>From the docstring;

"""rrdtool extended commands.

Adds "summary" and "addrra" rrdtool commands.

The "summary" command will output a short summary of the RRD's DSs
and RRAs.

The "addrra" command will create a new rrd with added RRAs. These RRAs
will be populated with as much data as can be derived by rrdxport from
the existing RRAs.

Usage:
  $0 summary <filename>
  $0 addrra <filename> <outfile> [RRA:CF:cf args] ...
"""

It's a bit rough and ready (no decent cmdline checking, error reporting,
help etc), but it works. I'll probably be polishing this up a bit over the
next couple of days, and maybe add functionality to remove RRAs and
add/remove DS's.

It works by running rrdtool to dump, modify, and restore xml. It will
probably break trying to add RRA's with fancy CF's not supported by rrdtool
xport.

-- 
Donovan Baarda <abo at minkirri.apana.org.au>
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