Comment 0 for bug 1416361

If instance is booted from a volume, Nova won't allow to resize the instance down, despite the fact root disk (ephemeral) is not even used:

2015-01-30 11:06:14.535 ERROR oslo.messaging.rpc.dispatcher [req-c788c8b2-d953-4f7f-962c-afca7ad41ff7 demo demo] Exception during message handling: Resize error: Unable to resize disk down.
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 137, in _dispatch_and_reply
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher incoming.message))
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 180, in _dispatch
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher return self._do_dispatch(endpoint, method, ctxt, args)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 126, in _do_dispatch
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher result = getattr(endpoint, method)(ctxt, **new_args)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/exception.py", line 88, in wrapped
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher payload)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 82, in __exit__
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher six.reraise(self.type_, self.value, self.tb)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/exception.py", line 71, in wrapped
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher return f(self, context, *args, **kw)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 296, in decorated_function
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher pass
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 82, in __exit__
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher six.reraise(self.type_, self.value, self.tb)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 281, in decorated_function
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher return function(self, context, *args, **kwargs)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 346, in decorated_function
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher return function(self, context, *args, **kwargs)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 269, in decorated_function
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher migration.instance_uuid, exc_info=True)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 82, in __exit__
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher six.reraise(self.type_, self.value, self.tb)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 255, in decorated_function
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher return function(self, context, *args, **kwargs)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 324, in decorated_function
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher kwargs['instance'], e, sys.exc_info())
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 82, in __exit__
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher six.reraise(self.type_, self.value, self.tb)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 312, in decorated_function
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher return function(self, context, *args, **kwargs)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 3851, in resize_instance
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher self.instance_events.clear_events_for_instance(instance)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher self.gen.throw(type, value, traceback)
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher File "/opt/stack/nova/nova/compute/manager.py", line 6183, in _error_out_instance_on_exception
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher raise error.inner_exception
2015-01-30 11:06:14.535 TRACE oslo.messaging.rpc.dispatcher ResizeError: Resize error: Unable to resize disk down.