[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
several sources.

Another example (using the same DEFs):


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