Open Stack

Getting an error trying to boot an instance from volume (the following is
the traceback from nova compute):

(nova.rpc): TRACE: Traceback (most recent call last):
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/rpc/impl_kombu.py", line
723, in _process_data
(nova.rpc): TRACE:     rval = node_func(context=ctxt, **node_args)
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/exception.py", line 126, in
wrapped
(nova.rpc): TRACE:     return f(*args, **kw)
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/compute/manager.py", line
150, in decorated_function
(nova.rpc): TRACE:     self.add_instance_fault_from_exc(context,
instance_uuid, e)
(nova.rpc): TRACE:   File "/usr/lib/python2.7/contextlib.py", line 24, in
__exit__
(nova.rpc): TRACE:     self.gen.next()
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/compute/manager.py", line
145, in decorated_function
(nova.rpc): TRACE:     return function(self, context, instance_uuid, *args,
**kwargs)
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/compute/manager.py", line
565, in run_instance
(nova.rpc): TRACE:     self._run_instance(context, instance_uuid, **kwargs)
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/compute/manager.py", line
394, in _run_instance
(nova.rpc): TRACE:     vm_state=vm_states.ERROR)
(nova.rpc): TRACE:   File "/usr/lib/python2.7/contextlib.py", line 24, in
__exit__
(nova.rpc): TRACE:     self.gen.next()
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/compute/manager.py", line
381, in _run_instance
(nova.rpc): TRACE:     self._deallocate_network(context, instance)
(nova.rpc): TRACE:   File "/usr/lib/python2.7/contextlib.py", line 24, in
__exit__
(nova.rpc): TRACE:     self.gen.next()
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/compute/manager.py", line
378, in _run_instance
(nova.rpc): TRACE:     injected_files, admin_password)
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/compute/manager.py", line
511, in _spawn
(nova.rpc): TRACE:     network_info, block_device_info)
(nova.rpc): TRACE:   File "/opt/stack/nova/nova/exception.py", line 126, in
wrapped
(nova.rpc): TRACE:     return f(*args, **kw)
(nova.rpc): TRACE:   File
"/opt/stack/nova/nova/virt/libvirt/connection.py", line 681, in spawn
(nova.rpc): TRACE:     domain = self._create_new_domain(xml)
(nova.rpc): TRACE:   File
"/opt/stack/nova/nova/virt/libvirt/connection.py", line 1255, in
_create_new_domain
(nova.rpc): TRACE:     domain = self._conn.defineXML(xml)
(nova.rpc): TRACE:   File "/usr/lib/python2.7/dist-packages/libvirt.py",
line 1708, in defineXML
(nova.rpc): TRACE:     if ret is None:raise
libvirtError('virDomainDefineXML() failed', conn=self)
(nova.rpc): TRACE: libvirtError: internal error Invalid harddisk device
name: /dev/vda
(nova.rpc): TRACE:

The block_device_mapping supplied was {"/dev/vda": "1:::1"} which results
in:
[{u'volume_size': u'', u'device_name': u'/dev/vda',
u'delete_on_termination': u'1', u'volume_id': u'1'}]), however I've tried
about every combination of values I can think of (supplying type, size,
changing device name, etc.) with the same result (although the error is
"Invalid harddisk device name: /dev/vdb" or whatever I supplied as the
device name).

If it helps:
Running devstack @ af0f7cadb9
Tried to launch an instance with both the cirros default devstack image and
UEC oneiric x64.
The existing volume is larger than the image's ephemeral volume (not sure
if that matters).

What am I doing wrong?
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