[rrd-users] Make new RRAs in an existing database?

[Shawn]

Let's say I wanted to create a 10 and/or 20 yr roll-up in a database
that already exists. Would I:
  1. somehow just add the RRA
  2. create a new database including the desired RRAs and fetch, then
import the data

I just don't want to go through the work of doing #2 if there's an
easier way...

Below is a snippet of Perl for creating my weather database for any
given location: (criticism appreciated)

    RRDs::create ($rrdfile,"--start",$time-1800,
                "DS:temp:GAUGE:1800:U:U",
                "DS:temp_c:GAUGE:1800:U:U",
                "DS:heat:GAUGE:1800:U:U",
                "DS:wind:GAUGE:1800:U:U",
                "DS:humi:GAUGE:1800:U:U",
                "DS:dewp:GAUGE:1800:U:U",
                "RRA:AVERAGE:0.5:1:96",
                "RRA:AVERAGE:0.5:1:672",
                "RRA:AVERAGE:0.5:4:744",
                "RRA:AVERAGE:0.5:24:1460",
                "RRA:AVERAGE:0.5:48:1460",
                "RRA:MAX:0.5:1:96",
                "RRA:MAX:0.5:1:672",
                "RRA:MAX:0.5:4:744",
                "RRA:MAX:0.5:24:1460",
                "RRA:MAX:0.5:48:1460",
                "RRA:MIN:0.5:1:96",
                "RRA:MIN:0.5:1:672",
                "RRA:MIN:0.5:4:744",
                "RRA:MIN:0.5:24:1460",
                "RRA:MIN:0.5:48:1460"
                );

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