[rrd-users] Can a graph be created that aggregates a set of (identically structured) rrd files?
Alex van den Bogaerdt
alex at vandenbogaerdt.nl
Fri Jul 8 03:13:03 CEST 2011
> Hi folks,
> I am new to RRD and still trying to wrap my mind around the power of this
> excellent tool. I am working on an application to use RRD to store
> electricity meter data for a group of homes. I am expecting to create an
> RRD file for each home, and it will have a number of RRA's defined for
> various time periods.
Good. I suggest you store Joules, or kilowatthours.
> In addition to displaying the individual house data graphs, I would like
> to also create graphs that show aggregated results drawn from the house
> RRD files. For example, I might show the combined power draw in watts for
> the 8 homes that make up a quadrant of my neighborhood, or show the total
> power draw from all 30 homes.
> Is there a reasonably-straightforward way to do this in RRD?
There are several things to improve in this (incomplete) example, but what
I show here is the answer to your question: how to combine data from
Another example (using the same DEFs):
More information about the rrd-users