ExecutionError: Unexpected error while running command. Command: rbd map volume-4dcb78d5-e0ce-4bfc-95ae-36a4417c35d8 --pool volumes --id volumes --mon_host 10.236.223.131:6789 --mon_host 10.236.223.132:6789 Exit code: 6 Stdout: 'RBD image feature set mismatch. You can disable features unsupported by the kernel with "rbd feature disable volumes/volume-4dcb78d5-e0ce-4bfc-95ae-36a4417c35d8 journaling".\nIn some cases useful info is found in syslog - try "dmesg | tail".\n' Stderr: 'rbd: sysfs write failed\nrbd: map failed: (6) No such device or address\n' I am trying to add a 20 GB plain volume created through Horizon GUI to an existing Windows 2012 R VM running with VirtIO drivers installed. But this volume adding results in the error as shown above, trace tells to fix it by rbd feature disable .. what is the permanent fix for this issue ? and why it happens ? ( OpenStack Ussuri, Glance, Ceph , qemu-kvm) root@ctrl1:/home/cloud# ceph --version ceph version 14.2.19 (bb796b9b5bab9463106022eef406373182465d11) nautilus (stable) root@ctrl1:/home/cloud#