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Revision 8a69b3a8

ID8a69b3a8193cab2c46daceccf8686028a43cecc3

Added by Andrea Spadaccini over 10 years ago

Add DRBD barriers disk parameters

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: Andrea Spadaccini <>
Reviewed-by: Iustin Pop <>

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