I removed the HBA card and mounted in the three M.2 slots on the mobo to get a baseline.
cache: 2 x mirror ZFS nvme ssd
tempdrive: 1 x btrfs nvme ssd
kjell_ern: 10 x sata ssd in raidz2
The nvme drives seems to be ok.
The reason for introducing the HBA in the first place, was to rebuild the storage pool "kjell_ern" (where the media library lives), to include nvme ssd´s as meta cache to improve write speeds. Unless Supermicro Support comes up with a fix, I abort the idea of a hba, and saves 30W on top.
We can kinda call this case closed. Thanks for holding hand.
