Qemu RBD image usage

Hi all, I want to attach another RBD image into the Qemu VM to be used as disk. However, it always failed. The VM definiation xml is attached. Could anyone tell me where I did wrong? || nstcc3@nstcloudcc3:~$ sudo virsh start ubuntu_18_04_mysql --console || error: Failed to start domain ubuntu_18_04_mysql || error: internal error: process exited while connecting to monitor: || 2019-12-09T16:24:30.284454Z qemu-system-x86_64: -drive || file=rbd:rwl_mysql/mysql_image:auth_supported=none:mon_host=nstcloudcc4\:6789,format=raw,if=none,id=drive-virtio-disk1: || error connecting: Operation not supported The cluster info is below: || ceph@nstcloudcc3:~$ ceph --version || ceph version 14.0.0-16935-g9b6ef711f3 (9b6ef711f3a40898756457cb287bf291f45943f0) octopus (dev) || ceph@nstcloudcc3:~$ ceph -s || cluster: || id: e31502ff-1fb4-40b7-89a8-2b85a77a3b09 || health: HEALTH_OK || || services: || mon: 1 daemons, quorum nstcloudcc4 (age 2h) || mgr: nstcloudcc4(active, since 2h) || osd: 4 osds: 4 up (since 2h), 4 in (since 2h) || || data: || pools: 1 pools, 128 pgs || objects: 6 objects, 6.3 KiB || usage: 4.0 GiB used, 7.3 TiB / 7.3 TiB avail || pgs: 128 active+clean || || ceph@nstcloudcc3:~$ || ceph@nstcloudcc3:~$ rbd info rwl_mysql/mysql_image || rbd image 'mysql_image': || size 100 GiB in 25600 objects || order 22 (4 MiB objects) || snapshot_count: 0 || id: 110feda39b1c || block_name_prefix: rbd_data.110feda39b1c || format: 2 || features: layering, exclusive-lock, object-map, fast-diff, deep-flatten || op_features: || flags: || create_timestamp: Mon Dec 9 23:48:17 2019 || access_timestamp: Mon Dec 9 23:48:17 2019 || modify_timestamp: Mon Dec 9 23:48:17 2019 B.R. Changcheng