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.. _ceph-volume-simple:
``simple``
==========
Implements the functionality needed to manage OSDs from the ``simple`` subcommand:
``ceph-volume simple``
**Command Line Subcommands**
* :ref:`ceph-volume-simple-scan`
* :ref:`ceph-volume-simple-activate`
* :ref:`ceph-volume-simple-systemd`
By *taking over* management, it disables all ``ceph-disk`` systemd units used
to trigger devices at startup, relying on basic (customizable) JSON
configuration and systemd for starting up OSDs.
This process involves two steps:
#. :ref:`Scan <ceph-volume-simple-scan>` the running OSD or the data device
#. :ref:`Activate <ceph-volume-simple-activate>` the scanned OSD
The scanning will infer everything that ``ceph-volume`` needs to start the OSD,
so that when activation is needed, the OSD can start normally without getting
interference from ``ceph-disk``.
As part of the activation process the systemd units for ``ceph-disk`` in charge
of reacting to ``udev`` events, are linked to ``/dev/null`` so that they are
fully inactive.
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