virt-sparsify

Make virtual machine drive images thin-provisioned. Note: Use only for offline machines to avoid data corruption. More information: https://libguestfs.org.

• Create a sparsified compressed image without snapshots from an unsparsified one:

virt-sparsify --compress path/to/image.qcow2 path/to/image_new.qcow2

• Sparsify an image in-place:

virt-sparsify --in-place path/to/image.img