.. _ceph-volume-lvm-systemd:

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.