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45a4cd7921
This commit greatly improves the performance of the 'virt-df' command by batching as many disks as possible onto a single appliance. In many situations this means the appliance is launched only once, versus one launch per domain as before. However doing it this way is a lot more complex: (1) Because of limits in Linux and virtio-blk, we can only attach 26 disks maximum at a time to the appliance. (2) We have to use LVM filters (lvm-set-filter) to confine LVM to the disks of a single guest.