<disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/libvirt/images/rhel7.3.1507297895'> <privateData> <nodenames> <nodename type='storage' name='#block004'/> <nodename type='format' name='#block126'/> </nodenames> </privateData> </source> <backingStore type='file' index='1'> <format type='qcow2'/> <source file='/var/lib/libvirt/images/rhel7.3.1484071872'> <privateData> <nodenames> <nodename type='storage' name='#block256'/> <nodename type='format' name='#block313'/> </nodenames> </privateData> </source> </backingStore> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> </disk>