RRD4J, synology nas, persistence and charts

Hiya.
I have the following setup…
Synology nAS with OH 1.7.1 and Mosquitto.
MySensors and several other sensors using mqtt into OH.

Persistence…

Strategies {
// for rrd charts, we need a cron strategy
everyMinute : "0 * * * * ?"
}

Items {
MySensors* : strategy = everyMinute
}

in sitemap…

Text item=MySensors_Temperature
Text item=MySensors_Humidity
Chart item=MySensors_Temperature period=h refresh=6000

I get a chart like this…

The lowest values are correct.

If I look in Habmin I get values like:

This didn’t use to be a problem when I had openhab on a W7 pc.

Can anyone let me know what I’m doing wrong?
Thanks in advance.

Have you verified in the logs that the anomalous values are not being reported by your sensors themselves? I don’t see any reason why some of the values would be correct but others would not. Seems like it should be all working or nothing working.

Hi Rich,
Thanks for response and sorry for my delay: I have just spent 28h in transit overseas…

Anyway, so if I look in the events.log I see the correct numbers being logged:

2015-10-23 08:13:44 - MySensors_Temperature state updated to 19.0
2015-10-23 08:13:44 - MySensors_Temperature state updated to 19.0

2015-10-23 08:16:42 - MySensors_Temperature state updated to 18.8
2015-10-23 08:16:42 - MySensors_Temperature state updated to 18.8

2015-10-23 08:18:25 - MySensors_Temperature state updated to 18.8
2015-10-23 08:18:25 - MySensors_Temperature state updated to 18.8

2015-10-23 08:19:36 - MySensors_Temperature state updated to 18.3
2015-10-23 08:19:36 - MySensors_Temperature state updated to 18.3

There are some missing values, as the MySensors sensor only sends the MQTT message when there is a change in the value.

Note, these values don’t match the ones I see in Habmin:

Are there any other logs I should be checking to try to figure this out?

I’m assuming you don’t have any rules that trigger or update these Items which means I’m stumped.

I also note that the times don’t match either. They are off by +21 hours and some change.

Probably not the cause of your problem but it gives me concern there may be other things going on. I’m afraid I have no suggestions.

Hi Rich,
Sorry, I guessed the timecodes were not matching as I am currently overseas and my server is at home?

I have just searched my rules file in case I’d forgotten about any rules, but nothing there that should affect my temp sensors.

Cheers!

I have just searched my rules file in case I’d forgotten about any rules, but nothing there that should affect my temp sensors.