i need some hints or help
I use Openhabian since 2016. I’ve started on a RPI 3b with usb boot and Openhab on a M2-SSD.
About a year ago i’ve upgraded from stretch to buster and switch to a RPI4. Because of missing USB boot support i’ve booted Openhabian from my old SD card (but use the SSD as system disk).
Last week i’ve started to switch to USB boot from my SSD and upgraded the bootloader (with PI Imager) to directly boot from USB. Also updated Openhabian to newest version (with OH 2.5 support) over openhabian-config. OS was already up-to-date because of using unattend-upgrade in Raspbian buster.
It works smooth, no SD card needed anymore.
But: since i’ve boot directly from my SSD the system load has increased about 200%. Before the load was 0.5 on normal state. Since there the system is permanently 1.2-1.5.
If i stop Openhab, Grafana-Server, Influx, Samba and Webmin (using for monitoring) the load don’t decrease under 1.0 - so this ressource consumption should come directly from the operating system.
Here is a screenshot from htop after stopping this services:
I’ve also checked iotop, but no activity on the disk.
Any hints, what could cause this high load or how to debug this?