Установите qemu-img:
yum install qemu-img
Converting qcow2 image to raw image format using qemu-img:
qemu-img convert -f qcow2 -O raw image.qcow2 image.img
Converting raw image to qcow2 image format using qemu-img:
qemu-img convert -f raw -O qcow2 image.img image.qcow2