doc/ceph-volume/lvm/systemd.rst
.. _ceph-volume-lvm-systemd:
Upon startup, it will identify the logical volume using :term:LVM tags,
finding a matching ID and later ensuring it is the right one with
the :term:OSD uuid.
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 lvm trigger sub-command, which is only in charge of parsing metadata coming from
systemd and startup, and then dispatching to ceph-volume lvm activate which
would proceed with activation.