'image' uses a qcow2 feature which is not supported by this qemu version: QCOW version 3
1.1 为新的QCOW V3 centos7/Fedora20 qemu-img支持格式,通过如下命令转化成低版本支持的QCOW2
qemu-img amend -f qcow2 -o compat=0.10 test.qcow2
qemu versions starting with 1.1 can use new qcow2 features which require an incompatible on-disk format. Between version 1.1 and 1.6, they needed to be specified explicitly during image creation, like this: qemu-img create -f qcow2 -o compat=1.1 test.qcow2 8G Starting with qemu 1.7, compat=1.1 became the default, so that newly created images can't be read by older qemu versions by default. If you need to read them in older version, you now need to be explicit about using the old format: qemu-img create -f qcow2 -o compat=0.10 test.qcow2 8G With the same release, qemu 1.7, a new qemu-img subcommand was introduced that allows converting between both versions, so you can downgrade your existing v3 image to the format known by RHEL 6 like this: qemu-img amend -f qcow2 -o compat=0.10 test.qcow2