I am testing your product with Proxmox/KVM virtual machine and a virtio virtual hard drive.
Fog doesn’t recognise the virtual hard drive.
Have you plan to integre virtio drivers ?
Sorry to necropost, but I came across this same issue with my PVE host and thought that others may find this thread via google (as I did) and I wanted to add my 2c.
FOG kernel support or a custom kernel are probably the ideal solutions, but a quick and dirty workaround is to remove the Virtio vHDD from the VM and reload the .raw file as IDE. Everything then works as expected!
I don’t know if they have plans to integrate those drivers into the bzimage, but you could roll your own - http://www.fogproject.org/wiki/index.php?title=Building_a_Custom_Kernel