Greets, I am unsure if it's a linux- or libvirt-issue: I added a 2nd virtio-disk to a kvm-based VM. The xml shows a correct "target": # first disk vda <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/mnt/r0/vm1_vda-clone.img'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> # second disk vdb <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/mnt/r0/www3_var.img'/> <target dev='vdb' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </disk> The VM contains Gentoo Linux, grub comes up fine, but then it flips the devices: The unpartitioned new disk is vda, therefore there is no root-fs etc ... I know my way to fix this via Live-CD or so, but I would really like to understand what happened! I'd like to keep vda as root etc. Could someone explain? libvirt-0.8.6 and qemu-kvm-0.13.0-r2 on a gentoo-host, btw. Thanks, Stefan