Rrd4j data not available in charts

Setup, Configuration and Use Beginners
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1

I store values from temperature sensors with rrd4j persistence. I configured a specific rrd4j config for these items as I want to store values for the last 60 days with 1-minute granularity (which is slightly different from what the default datasource provides).

This is the datasource config in services/rrd4j.cfg:

heating_sensors.def=GAUGE,600,U,U,10
heating_sensors.archives=LAST,0.5,1,360:AVERAGE,0.5,6,86400:AVERAGE,0.5,90,36500:AVERAGE,0.5,360,43800:AVERAGE,0.5,8640,3650
heating_sensors.items=MQTT_solar_vorlauf,MQTT_solar_ruecklauf

The first archive covers 60 minutes with 10-seconds granularity, the 2nd archive covers 60 days with 1-minute-granularity, the 3rd archive covers ca 1 year with 15-minute-granularity, and so on…

Here the persistence config in persistence/rrd4j.persist:

Strategies {
    everyMinute : "0 * * * * ?"
}

MQTT_solar_ruecklauf, MQTT_solar_vorlauf : strategy = everyChange, everyMinute

The problem is that when analyzing these items, the chart does only show values of the last hour (apparently from the first archive) even though older values are existing / stored in the corresponding archives of the rrd database file (verified via RRD-Inspector).

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I’ve already cleaned cache (via openhab-cli clean-cache), restarted openhab, deleted rrd database files but nothing helps.

Any ideas whats going wrong here?

2

The issue is possibly due to having more than one consolidation function (LAST and AVERAGE) defined.

There’s a comment in my rrd4j.cfg which says that only one is supported.

1 Like
3

Ah yes thats right, thanks for the hint. I must have missed that it is even mentioned in the docs :wink:
Ok, I changed the datasource definition to:

heating_sensors.def=GAUGE,600,U,U,10
heating_sensors.archives=AVERAGE,0.5,1,360:AVERAGE,0.5,6,86400:AVERAGE,0.5,90,36500:AVERAGE,0.5,360,43800:AVERAGE,0.5,8640,3650
heating_sensors.items=MQTT_solar_vorlauf,MQTT_solar_ruecklauf

Then stopped openHAB, deleted rrd files, cleaned the cache and restarted openHAB. Lets see in an hour if this solves the problem…

4

That did the trick :+1: Thanks for the hint @MikeJMajor
Next time I will try to read the docs more careful… :wink: