[libvirt] Virsh Attach Volume Fails

Hi, When trying to attach a created volume to an instance using the virsh utility I am running into this error :- [] $ sudo virsh attach-device instance-00000015 disk.xml error: Failed to attach device from disk.xml error: internal error unable to execute QEMU command '__com.redhat_drive_add': Device 'drive-virtio-disk21' could not be initialized For experimental purpose I have libvirt 0.10.2 and QEMU 0.12.1. The volume to be attached is on a remote storage. Any idea what I might be missing ? Thanks, Vilobh