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-.. _ceph-volume-systemd:
-
-systemd
-=======
-As part of the activation process (either with :ref:`ceph-volume-lvm-activate`
-or :ref:`ceph-volume-simple-activate`), systemd units will get enabled that
-will use the OSD id and uuid as part of their name. These units will be run
-when the system boots, and will proceed to activate their corresponding
-volumes via their sub-command implementation.
-
-The API for activation is a bit loose, it only requires two parts: the
-subcommand to use and any extra meta information separated by a dash. This
-convention makes the units look like::
-
-    ceph-volume@{command}-{extra metadata}
-
-The *extra metadata* can be anything needed that the subcommand implementing
-the processing might need. In the case of :ref:`ceph-volume-lvm` and
-:ref:`ceph-volume-simple`, both look to consume the :term:`OSD id` and :term:`OSD uuid`,
-but this is not a hard requirement, it is just how the sub-commands are
-implemented.
-
-Both the command and extra metadata gets persisted by systemd as part of the
-*"instance name"* of the unit.  For example an OSD with an ID of 0, for the
-``lvm`` sub-command would look like::
-
-    systemctl enable ceph-volume@lvm-0-0A3E1ED2-DA8A-4F0E-AA95-61DEC71768D6
-
-The enabled unit is a :term:`systemd oneshot` service, meant to start at boot
-after the local filesystem is ready to be used.
-
-
-Failure and Retries
--------------------
-It is common to have failures when a system is coming up online. The devices
-are sometimes not fully available and this unpredictable behavior may cause an
-OSD to not be ready to be used.
-
-There are two configurable environment variables used to set the retry
-behavior:
-
-* ``CEPH_VOLUME_SYSTEMD_TRIES``: Defaults to 30
-* ``CEPH_VOLUME_SYSTEMD_INTERVAL``: Defaults to 5
-
-The *"tries"* is a number that sets the maximum amount of times the unit will
-attempt to activate an OSD before giving up.
-
-The *"interval"* is a value in seconds that determines the waiting time before
-initiating another try at activating the OSD.