Ceph

/usr/sbin/ceph-disk --log-stdout -v trigger /dev/dm-1
DEBUG: main_trigger: Namespace(dev='/dev/dm-1', func=<function main_trigger at 0x12b6668>, log_stdout=True, prepend_to_path='/usr/bin', prog='ceph-disk', statedir='/var/lib/ceph', sync=None, sysconfdir='/etc/cep\
h', verbose=True)
INFO: systemd detected, triggering ceph-disk@/dev/dm-1.service
DEBUG: does /usr/bin/systemctl exists ?
DEBUG: yes, /usr/bin/systemctl exists
INFO: Running command: /usr/bin/systemctl --no-block restart ceph-disk@/dev/dm-1.service

And /var/log/messages has

Sep 19 09:22:42 target230089 systemd: Starting Ceph disk activation: /dev/dm/1...
Sep 19 09:22:42 target230089 flock: DEBUG: main_trigger: Namespace(dev='/dev/dm/1', func=<function main_trigger at 0x1ca16e0>, log_stdout=True, prepend_to_path='/usr/bin', prog='ceph-disk', statedir='/var/lib/ceph', sync=True, sysconfdir='/etc/ceph', verbose=True)
...
Sep 19 09:22:42 target230089 flock: OSError: [Errno 2] No such file or directory: '/dev/dm/1'
Sep 19 09:22:42 target230089 systemd: ceph-disk@-dev-dm-1.service: main process exited, code=exited, status=1/FAILURE
Sep 19 09:22:42 target230089 systemd: Failed to start Ceph disk activation: /dev/dm/1.