Hi Jussi After installing guest image, Convert it from raw to qcow2 by "convert" command. qemu-img convert -f raw disk0.raw -O qcow2 newdisk0.qcow2 Now you can mount newdisk to empty VM with virt-manager. Or you can edit <DOMAIN>.xml as follows.. /var/lib/libvirt/qemu/<DOMAIN>.xml: <domain type='kvm'> <name>vm1</name> <memory>524288</memory> <vcpu>1</vcpu> <os> <type arch='i686'>hvm</type> <boot dev='hd'/> </os> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/home/tsuyoshi/test/newdisk0.qcow2'/> <target dev='hda' bus='ide'/> </disk> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target port='0'/> </console> </devices> </domain> -- Tsuyoshi