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..., one running centos 5.5, the other running centos 6.0 * I created a virtual linux host with a raw file image centos6.img I can start this vm on both machines. * then I created an overlay of the file image with qemu-img create -b centos6.img -f qcow2 centos6.ovl when I start the VM from the ovelay on the centos6 machine I get: --- Booting from Hard Disk... Boot failed: not a bootable disk No bootable device --- When booting from the raw-image and adding the overlay as second disk I see the following: ========== cut here ========== fdisk -l Disk /dev/vda: 8598 MB, 8598323200 bytes 255 he...