I have OMV inside an Proxmox-VM on a Dell T40.
The installation process was straight-forward and smooth.
I installed an HBA and put it via pcie passthough to the omv vm.
When I now start the VM the complete system freezes.
I could narrow it to the hdds. As long as I insert the disks when the system and vm is running everthing is fine. When the disks are connected when the vm is down and I fire it up the system freezes again.