it seems that rrd4j persistence is not able to create multiple archives as described in wiki (openhab 1.8.1):
rrd4j:ctr5min.def=GAUGE,900,U,U,300 rrd4j:ctr5min.items=ebus_t_extern,ebus_t_in_now,ebus_t_in_aim,ebus_t_wa_htn,ebus_t_wa_ret rrd4j:ctr5min.archives=AVERAGE,0.5,6,1200 rrd4j:ctr5min.archives=AVERAGE,0.5,1,1200
Only the last line with archive directive is used by rrd4j - i.e. data are stored each five minutes. If I swap the lines, data are stored only each 30 minutes (6 * 300 seconds).
Is this a bug? Or a known, yet undocumented, limitation?
Here are the screenshots of RRD4J Inspector on one of the items: