hello hackers: i am using qemu-kvm with libvirt on centos6.3,i found that the qemu-kvm does not support disk only snapshot, when i use virsh snapshot-create-as --disk-only ,it will raise an error :the qemu-kvm binary does not support blkdev_snapshot but the qemu-kvm-rhev which come from RHEV works . is there any one know why the qemu-kvm-el6 does not support disk only snapshot feature? thanks.