Hey so I had some issues with my old UNRAID HW
TLDR I had some issues with a HBA as well as old HW, so I got some new HW and now I have some problems with the Cache-drive.
I got an upgrade to the hardware, to the following:
CPU – Ryzen 5 3600
MB - MSI x470 Gaming Plus
RAM – Crucial Ballistix 32GB
HBA - LSI 9211-8i
+ my old NVME from previous system – Crucial Force MP510 1TB
This was also the cache-drive in my "old" Unraid server.