Previously discussed here:
https://www.redhat.com/archives/libguestfs/2010-August/msg00002.html
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Richard Jones, Virtualization Group, Red Hat
http://people.redhat.com/~rjones
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine. Supports Linux and Windows.
http://et.redhat.com/~rjones/virt-df/