Qemu-img create

• • qemu-img create -f qcow2 MY_IMAGE_NAME.img
  • qemu-img create -f raw MY_IMAGE_NAME.img
  • qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img

lazy_refcounts=on Reference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough.