to fill the extra 5GB of space.
truncate -r olddisk newdisk; truncate -s +5G newdisk
- virt-filesystems --long --h --all -a olddisk
+ virt-filesystems --long -h --all -a olddisk
# Note "/dev/sda2" is a partition inside the "olddisk" file.
virt-resize --expand /dev/sda2 olddisk newdisk