Cacti: Planning RRDs

• RRDs are hard to manipulate and usually need to be re-generated from scratch when data fields need to be added, or precision needs to be changed.

• You can plan ahead by looking at the RRD that cacti generated (use debug mode), and recreate the same RRD file, but with dummy fields that can be changed to data fields later.

• Other RRD changes typically require regenerating the RRD file and resending all historical data (which parseecmpower can do).

• Remember to use 'turn on debug mode' in cacti's upper right corner for “data sources” and “graph management”.

• When needed, you can run your own rrdtool commands.