Thanks for the link
it is a card from Ali-expres.
as long as I don't assign it to a VM all 8 disks will be are listed in Proxmox.
In Xpen i can see only 4HDDs plus the 2 virtual ones of the VM.
If I pass the card to Openmediavault VM also all 8 are shown.
However, I would rather have the Xpenology
PcIe SATA Karte 8 Port 6G SATA Controller Expansion (Marvell)