• 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
constants.py 49.6 KB