qemu-img create -f qcow2 /var/lib/libvirt/images/panorama-data.qcow2 200G virsh attach-disk panorama /var/lib/libvirt/images/panorama-data.qcow2 vdb --live --config
Never trust a random QCOW2 from the internet. panorama-kvm-10.0.4.qcow2