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doc/ceph-volume lvm add back a system.rst with just the lvm portion of it

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Signed-off-by: Alfredo Deza <adeza@redhat.com>
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Alfredo Deza 2017-11-07 13:41:12 -05:00
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doc/ceph-volume/lvm/systemd.rst Normal file
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.. _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.