<disk type='file' device='disk'> <driver name='qemu' type='qed'/> <source file='/var/lib/libvirt/images/a'> <privateData> <nodenames> <nodename type='storage' name='node-a-s'/> <nodename type='format' name='node-a-f'/> </nodenames> </privateData> </source> <backingStore type='file' index='1'> <format type='qcow'/> <source file='/var/lib/libvirt/images/b'> <privateData> <nodenames> <nodename type='storage' name='node-b-s'/> <nodename type='format' name='node-b-f'/> </nodenames> </privateData> </source> <backingStore type='file' index='2'> <format type='vmdk'/> <source file='/var/lib/libvirt/images/c'> <privateData> <nodenames> <nodename type='storage' name='node-c-s'/> <nodename type='format' name='node-c-f'/> </nodenames> </privateData> </source> <backingStore type='file' index='3'> <format type='raw'/> <source file='/var/lib/libvirt/images/d'> <privateData> <nodenames> <nodename type='storage' name='node-d-s'/> <nodename type='format' name='node-d-f'/> </nodenames> </privateData> </source> <backingStore/> </backingStore> </backingStore> </backingStore> <target dev='vda'/> </disk>