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    • Andrea Spadaccini's avatar
      Add DRBD barriers disk parameters · 8a69b3a8
      Andrea Spadaccini authored
      
      
      Add the disk-barriers and meta-barriers parameters described in the
      design doc.
      
      constants.py:
      * add the needed LD and DT-level parameters, use the defaults provided
        at ./configure time;
      * add constants representing which barriers should be disabled and the
        set of valid options.
      
      lib/bdev.py:
      * factor the barriers handling code to a class method, for testing
        purposes;
      * implement the more granular version checking logic;
      * use the LD level parameters;
      * add stricter check on DRBD version (8.0, 8.2 or 8.3), as we do not
        support 8.4 yet.
      
      lib/cmdlib.py:
      * translate DT level parameters to LD level ones.
      
      configure.ac, Makefile.am:
      * set both disk and meta barriers parameters depending on the value of
        --enable-drbd-barriers.
      
      test/ganeti.bdev_unittest.py:
      * unit tests for the code that sets DRBD barrier parameters depending on
        the version.
      
      doc/design-resource-model.rst:
      * reword the description of meta-barriers;
      * change all disk parameters names to use dashes instead of underscores.
      Signed-off-by: default avatarAndrea Spadaccini <spadaccio@google.com>
      Reviewed-by: default avatarIustin Pop <iustin@google.com>
      8a69b3a8
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