Hi Tommi Virtanen, Actually we know the rbd full path,we write some data directly to volume. nova/volume1/<data>. Thanks, ramu. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html