[rrd-users] Can a graph be created that aggregates a set of (identically structured) rrd files?
jeff at thegilmores.net
Fri Jul 8 16:55:15 CEST 2011
Perfect, just what I needed.
I knew this slick software would be up to the task...
On Jul 7, 2011, at 9:13 PM, Alex van den Bogaerdt wrote:
>> 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):
> rrd-users mailing list
> rrd-users at lists.oetiker.ch
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