systemd¶
Upon startup, it will identify the logical volume by loading the JSON file in
/etc/ceph/osd/{id}-{uuid}.json corresponding to the instance name of the
systemd unit.
After identifying the correct volume it will then proceed to mount it by using the OSD destination conventions, that is:
/var/lib/ceph/osd/{cluster name}-{osd id}
For our example OSD with an id of 0, that means the identified device will
be mounted at:
/var/lib/ceph/osd/ceph-0
Once that process is complete, a call will be made to start the OSD:
systemctl start ceph-osd@0
The systemd portion of this process is handled by the ceph-volume simple
trigger sub-command, which is only in charge of parsing metadata coming from
systemd and startup, and then dispatching to ceph-volume simple activate which
would proceed with activation.
