rrdtool create water.rrd --no-overwrite --step 60 DS:counter:GAUGE:86400:0:100000
DS:consum:ABSOLUTE:86400:0:1 RRA:LAST:0.5:1:4320 RRA:AVERAGE:0.5:1:4320 RRA:LAST:0.5:1440:30
RRA:AVERAGE:0.5:1440:30 RRA:LAST:0.5:10080:520 RRA:AVERAGE:0.5:10080:520