Perfect, just what I needed. I knew this slick software would be up to the task...
Jeff 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? > > DEF:meter1=/home/user/data/rrd/house1.rrd:meter:AVERAGE > DEF:meter2=/home/user/data/rrd/house2.rrd:meter:AVERAGE > DEF:meter3=/home/user/data/rrd/house3.rrd:meter:AVERAGE > [...] > CDEF:total=meter1,meter2,meter3.... > [...] > LINE1:total#000:total > > > 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): > > [...] > AREA:meter1#F00 > AREA:meter2#FC0::STACK > AREA:meter3#0C0::STACK > AREA:meter4#F00::STACK > [...] > > _______________________________________________ > rrd-users mailing list > rrd-users@lists.oetiker.ch > https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
_______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users