Im actually facing similar situation now.
Ive bought ASROCK-J4205-ITX MB, to build NAS,Media Server in one (was also thinking about HP).
1. VM for OMV
2. VM for Kodi (probably openELEC)
3. VM for OS server (win,linux)
ESXi/Proxmox will be on separate HDD (other than NAS HDDs)
but im facing issue with ESXi/Proxmox that when i create VM with OMV - i cant mount the physical HDD into the VM, it wants to create some virtual disk image on the physical HDD.
Reason i dont want to go this way is that i have already data on that drive (EXT4) and still being used in my "old" NAS Zysel NSA-325.
It makes no sense for me to copy all the data into some image on the same HDD, i dont even have that much space left.
Any advice how to do that? Thanks