I'm also having the same problem. Using RBD for both Cinder and Glance
image backend. If I create an instance and select in horizon 'boot from
image (create new volume)', soft/hard reboot  fails later.

I get the following error from the compute manager:

2013-11-19 09:56:26.036 ERROR nova.openstack.common.rpc.amqp 
[req-b5d86ef0-f03d-4708-b94a-e94f30055b18 admin demo] Exception during message 
handling
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp Traceback (most 
recent call last):
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/openstack/common/rpc/amqp.py", line 461, in _process_data
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     **args)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/openstack/common/rpc/dispatcher.py", line 172, in dispatch
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     result = 
getattr(proxyobj, method)(ctxt, **kwargs)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/compute/manager.py", line 353, in decorated_function
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     return 
function(self, context, *args, **kwargs)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/exception.py", line 90, in wrapped
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     payload)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/exception.py", line 73, in wrapped
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     return f(self, 
context, *args, **kw)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/compute/manager.py", line 243, in decorated_function
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     pass
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/compute/manager.py", line 229, in decorated_function
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     return 
function(self, context, *args, **kwargs)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/compute/manager.py", line 294, in decorated_function
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     function(self, 
context, *args, **kwargs)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/compute/manager.py", line 271, in decorated_function
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     e, 
sys.exc_info())
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/compute/manager.py", line 258, in decorated_function
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     return 
function(self, context, *args, **kwargs)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/compute/manager.py", line 2121, in reboot_instance
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     
block_device_info = self._get_instance_volume_block_device_info(
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/virt/libvirt/driver.py", line 1822, in reboot
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     
block_device_info)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/virt/libvirt/driver.py", line 1903, in _hard_reboot
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     
block_device_info)
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/opt/stack/nova/nova/virt/libvirt/driver.py", line 4323, in 
get_instance_disk_info
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     dk_size = 
int(os.path.getsize(path))
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp   File 
"/usr/lib/python2.7/genericpath.py", line 49, in getsize
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp     return 
os.stat(filename).st_size
2013-11-19 09:56:26.036 TRACE nova.openstack.common.rpc.amqp OSError: [Errno 2] 
No such file or directory: 
'/opt/stack/data/nova/instances/9c20f05d-9bae-4162-9408-1bddaa157dd5/disk'

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https://bugs.launchpad.net/bugs/1245719

Title:
  RBD backed instance can't shutdown and restart

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