ceph/doc/ceph-volume/simple/index.rst

   1 .. _ceph-volume-simple:
   2
   3 ``simple``
   4 ==========
   5 Implements the functionality needed to manage OSDs from the ``simple`` subcommand:
   6 ``ceph-volume simple``
   7
   8 **Command Line Subcommands**
   9
  10 * :ref:`ceph-volume-simple-scan`
  11
  12 * :ref:`ceph-volume-simple-activate`
  13
  14 * :ref:`ceph-volume-simple-systemd`
  15
  16
  17 By *taking over* management, it disables all ``ceph-disk`` systemd units used
  18 to trigger devices at startup, relying on basic (customizable) JSON
  19 configuration and systemd for starting up OSDs.
  20
  21 This process involves two steps:
  22
  23 #. :ref:`Scan <ceph-volume-simple-scan>` the running OSD or the data device
  24 #. :ref:`Activate <ceph-volume-simple-activate>` the scanned OSD
  25
  26 The scanning will infer everything that ``ceph-volume`` needs to start the OSD,
  27 so that when activation is needed, the OSD can start normally without getting
  28 interference from ``ceph-disk``.
  29
  30 As part of the activation process the systemd units for ``ceph-disk`` in charge
  31 of reacting to ``udev`` events, are linked to ``/dev/null`` so that they are
  32 fully inactive.