How to add new rra to existing rrd file

[chopin]

hello,
some time ago i create rrd:
rrdtool create file.rrd \
--step 60 \
DS:traffic_in:COUNTER:120:0:10000000 \
DS:traffic_out:COUNTER:120:0:10000000 \
RRA:AVERAGE:0.5:1:43200 \
RRA:AVERAGE:0.5:5:51840 \
RRA:AVERAGE:0.5:30:34560 \
RRA:MAX:0.5:1:43200 \
RRA:MAX:0.5:5:51840 \
RRA:MAX:0.5:30:34560 \

I want do add:
RRA:AVERAGE:0.5:120:43800 \
RRA:MAX:0.5:120:43800 \

and dont loose existing data. It is possible to do this ? If yes, how ?

Regards
Adam Chabin

[BSOD2600]

I don't think there is a command that will do that for you...easily. Look through the rrdtool commands http://people.ee.ethz.ch/~oetiker/webto ... ex.en.html

You'll probably have to dump the contents, create a new file and then maybe it will import it back to the new file. If not, you'll have to modify the data while in the dumped state, then reimport back to rrd file.