+ if not constants.DRBD_BARRIERS: # disable barriers, if configured so
+ version = cls._GetVersion()
+ # various DRBD versions support different disk barrier options;
+ # what we aim here is to revert back to the 'drain' method of
+ # disk flushes and to disable metadata barriers, in effect going
+ # back to pre-8.0.7 behaviour
+ vmaj = version['k_major']
+ vmin = version['k_minor']
+ vrel = version['k_point']
+ assert vmaj == 8
+ if vmin == 0: # 8.0.x
+ if vrel >= 12:
+ args.extend(['-i', '-m'])
+ elif vmin == 2: # 8.2.x
+ if vrel >= 7:
+ args.extend(['-i', '-m'])
+ elif vmaj >= 3: # 8.3.x or newer
+ args.extend(['-i', '-a', 'm'])