Performance Statistics Problem

Hello, i have a strange problem and dont know how to fix it in Linux

Fresh installed OMV5.x on SDA / all Raid Drives disconnected (comming from 4.x), works fine.

Root was on SDA, after reconnecting the Raid drives, Root swapped over to SDF. No Problem. SDA-E & SDG-H is my raid.

Performance Statistics working. But with each reboot my Root Device jumps to another Point (SDA > SDE > SDF > ...)

It is not fixed, thats what mess up my statistics - the only way is edit /etc/collectd/collectd.conf.d/disk.conf and restart collectd.

How do i fix this damn Drive

Thanks

Will try that later @home, thanks. Another question, can i fix my SDD to sda? how?

Edit: am i right? to have the sdd on sda i must connect it to the primary (first) port on my motherboard?