Qemu-img create

• qemu-img create -f qcow2 MY_IMAGE_NAME.qcow2 10G
• 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.

qemu-img create -f qcow2 MY_IMAGE_NAME.img 10G

qemu-img create -f qcow2 MY_IMAGE_NAME.qcow2  20G
Formatting 'MY_IMAGE_NAME.qcow2', fmt=qcow2 size=21474836480 cluster_size=65536 lazy_refcounts=off refcount_bits=16

qemu-img create -f qcow2 MY_IMAGE_NAME.img
qemu-img: MY_IMAGE_NAME.img: Image creation needs a size parameter

Related commands

• virt-install

See also

• qemu-img: qemu-img info, qemu-img check, qemu-img resize, qemu-img create, qcow2, qemu-img rebase, qemu-img convert, qemu-img commit, qemu-img ammend