adding new datasource to an existing RRD

Question

I have few 100s of rrds and i want to add 5 extra datasource to all of those rrds.

1. Is it advisable to do so
2. Whats the best way and the fastest way to do

Answer 1

Since version 1.5 rrdtool create can "pre-fill" the data from existing file(s) with the --source option. This feature solves the problem without the need of additional scripts.