virt-sparsify
命令手册Make virtual machine drive images thin-provisioned. NOTE: Use only for offline machines to avoid data corruption. Home page: https://libguestfs.org/.
virt-sparsify --compress {{path/to/image.qcow2}} {{path/to/image_new.qcow2}}
virt-sparsify --in-place {{path/to/image.img}}