drbdmanagedrv limited to 2047 GB

[DHE]

This is from an RDO installation on CentOS 7.

When attempting to create a volume >= 2 TiB the following error will occur:

2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 150, in dispatch
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server return self._do_dispatch(endpoint, method, ctxt, args)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 121, in _do_dispatch
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server result = func(ctxt, **new_args)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 4367, in create_volume
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server allow_reschedule=allow_reschedule, volume=volume)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 635, in create_volume
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server _run_flow()
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 627, in _run_flow
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server flow_engine.run()
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/taskflow/engines/action_engine/engine.py", line 247, in run
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server for _state in self.run_iter(timeout=timeout):
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/taskflow/engines/action_engine/engine.py", line 340, in run_iter
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server failure.Failure.reraise_if_any(er_failures)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/taskflow/types/failure.py", line 336, in reraise_if_any
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server failures[0].reraise()
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/taskflow/types/failure.py", line 343, in reraise
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server six.reraise(*self._exc_info)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/taskflow/engines/action_engine/executor.py", line 53, in _execute_task
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server result = task.execute(**arguments)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/flows/manager/create_volume.py", line 840, in execute
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server model_update = self._create_raw_volume(volume, **volume_spec)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/flows/manager/create_volume.py", line 819, in _create_raw_volume
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server return self.driver.create_volume(volume)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/drivers/drbdmanagedrv.py", line 532, in create_volume
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server props)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/drivers/drbdmanagedrv.py", line 195, in call_or_reconnect
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server return fn(*args)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib64/python2.7/site-packages/dbus/proxies.py", line 145, in __call__
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server **keywords)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server File "/usr/lib64/python2.7/site-packages/dbus/connection.py", line 641, in call_blocking
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server message.append(signature=signature, *args)
2018-02-13 10:09:22.527 28407 ERROR oslo_messaging.rpc.server OverflowError: Value -1048576 out of range for Int32

This specific example is for 4095 GB.

The cause seems to be the dbus-python layer clipping the volume size (drbdmanage uses kiB for units) to its own internal Int32 type by default.

Possible solution: function _vol_size_to_dm should return a long type instead to force Int64 conversion.