-1. Copyright
    =========

  Copyright: (C) 2017 by Thomas Bruecker

  This program / these concepts are free software; you can redistribute it
  and/or modify it (if applicable) under the terms of the GNU   L E S S E R
  General Public License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This program / these concepts are distributed in the hope that they will be
  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  L E S S E R   General Public License for more details.

  You should have received a copy of the GNU   L E S S E R   General Public
  License along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


Brainstorming
=============

0. Introduction; 'Raid'
   -------------------

* <Mostly the same as for {A8A2BB2C-78F0-11E6-B6F3-0000C00A45A9} (pseudo raid)>.
* Component medias (devices) are specified explicitely.

1. Parameters
   ----------

* <Mostly the same as for {A8A2BB2C-78F0-11E6-B6F3-0000C00A45A9} (pseudo raid)>.

* + mandatory:
  * (active medias [devices]):
    * ActiveMedias[<I>]='EF1B0E3F-3CB0-11DB-B6E3-0000C00A45A9.<component index>;

      * ActiveWriteMostlyMedias[J]=
                        'EF1B0E3F-3CB0-11DB-B6E3-0000C00A45A9.<component index>
        --> the media with declared by "ActiveWriteMostlyMedias[<...>]<...>"
        will be 'flagged as 'write-mostly' (see "man mdadm"; "--write-mostly").
        * (splitting the active components of the raid in
          '"ActiveMedias[<...>]"-components'
          and '"ActiveWriteMostlyMedias[<...>]"-components', reorders
          eventually the components; this does not harm, because
          "--write-mostly" is only valid for a "raid1"; and in a "raid1" the
          order of the components is not [besides the source-media for
          resynchronization] important).

      * "component index" discerns the individual component medias,
      * "I", "J" in {0, ...}; <I> + <J> <= "<numActiveComponents>".
* ^ no "START" !!!

* + optional:
  * RealizationOptions: takes also
    * "bitmap=<filename>"; --> path = "UUID.d/<filename>";
    * "bitmap-chunk=<M>"; M in 1024 bytes;
    * "write-behind=<N>;  N: 0 <= N <= 16383 "write-behind" (see "man mdadm").

  * (spare medias [devices]):
    * numSpareComponents: (see "man mdadm"; "--spare-devices").

    * SpareMedias[<I>]='EF1B0E3F-3CB0-11DB-B6E3-0000C00A45A9.<component index>;

      * SpareWriteMostlyMedias[<J>]=
                        'EF1B0E3F-3CB0-11DB-B6E3-0000C00A45A9.<component index>
        --> the media with declared by "SpareWriteMostlyMedias[<...>]<...>"
        will be 'flagged as' 'write-mostly' (see "man mdadm"; "--write-mostly").
        (and it works: write-mostyl medias are replaced by write-mostly spare
         medias).

      * "component index" discerns the individual component medias,
      * "I", "J" in {0, ...}; <I> + <J> <= "<numSpareComponents>".

    * TIMEOUT (in sec); when realizing the media, waits <TIMEOUT> for its
      component medias to get ready, before issuing an error message.