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Hi all,

I'm trying to resize an instance between two XenServer, each managed
by a domU running Natty and current Diablo milestone.
When I schedule the resize the instance gets a snapshot and its vhd
file get  copyed by rsync on the other host. At this point the task
fails.
At this time there is a record on migrations table of cloud controller's mysql.
On source host's  nova-compute log i can see:

2011-09-20 18:11:34,446 DEBUG nova.rpc [-] received
{u'_context_roles': [], u'_context_request_id':
u'da2ac014-1600-4fa4-9be7-4c53add5caa4', u'_context_read_deleted':
False, u'args': {u'instance_id':
u'4548a3ed-2989-4fe7-bca9-bdf55bc9635a', u'migration_id': 12},
u'_context_auth_token': None, u'_context_is_admin': True,
u'_context_project_id': u'gcivitella_proj', u'_context_timestamp':
u'2011-09-20T16:11:33.724787', u'_context_user_id':
u'gcivitella_name', u'method': u'resize_instance',
u'_context_remote_address': u'127.0.0.1'} from (pid=20478)
process_data /usr/lib/pymodules/python2.7/nova/rpc/amqp.py:200
2011-09-20 18:11:34,447 DEBUG nova.rpc [-] unpacked context:
{'user_id': u'gcivitella_name', 'roles': [], 'timestamp':
u'2011-09-20T16:11:33.724787', 'auth_token': None, 'msg_id': None,
'remote_address': u'127.0.0.1', 'is_admin': True, 'request_id':
u'da2ac014-1600-4fa4-9be7-4c53add5caa4', 'project_id':
u'gcivitella_proj', 'read_deleted': False} from (pid=20478)
_unpack_context /usr/lib/pymodules/python2.7/nova/rpc/amqp.py:432
2011-09-20 18:11:34,447 INFO nova.compute.manager
[da2ac014-1600-4fa4-9be7-4c53add5caa4 gcivitella_name gcivitella_proj]
check_instance_lock: decorating: |<function resize_instance at
0x362d758>|
2011-09-20 18:11:34,448 INFO nova.compute.manager
[da2ac014-1600-4fa4-9be7-4c53add5caa4 gcivitella_name gcivitella_proj]
check_instance_lock: arguments: |<nova.compute.manager.ComputeManager
object at 0x2f56810>| |<nova.rpc.amqp.RpcContext object at 0x4b46e50>|
|4548a3ed-2989-4fe7-bca9-bdf55bc9635a|
2011-09-20 18:11:34,448 DEBUG nova.compute.manager
[da2ac014-1600-4fa4-9be7-4c53add5caa4 gcivitella_name gcivitella_proj]
instance 4548a3ed-2989-4fe7-bca9-bdf55bc9635a: getting locked state
from (pid=20478) get_lock
/usr/lib/pymodules/python2.7/nova/compute/manager.py:1121
2011-09-20 18:11:34,522 INFO nova.compute.manager
[da2ac014-1600-4fa4-9be7-4c53add5caa4 gcivitella_name gcivitella_proj]
check_instance_lock: locked: |False|
2011-09-20 18:11:34,522 INFO nova.compute.manager
[da2ac014-1600-4fa4-9be7-4c53add5caa4 gcivitella_name gcivitella_proj]
check_instance_lock: admin: |True|
2011-09-20 18:11:34,523 INFO nova.compute.manager
[da2ac014-1600-4fa4-9be7-4c53add5caa4 gcivitella_name gcivitella_proj]
check_instance_lock: executing: |<function resize_instance at
0x362d758>|
2011-09-20 18:11:34,716 DEBUG nova [-] Starting snapshot for VM
<nova.db.sqlalchemy.models.Instance object at 0x496eb10> from
(pid=20478) _get_snapshot
/usr/lib/pymodules/python2.7/nova/virt/xenapi/vmops.py:515
2011-09-20 18:11:34,723 DEBUG nova.virt.xenapi.vm_utils [-]
Snapshotting VM OpaqueRef:defbf1c9-f3e6-3822-f110-7b61a35b7c18 with
label 'instance-00000048-snapshot'... from (pid=20478) create_snapshot
/usr/lib/pymodules/python2.7/nova/virt/xenapi/vm_utils.py:338
2011-09-20 18:11:36,337 INFO nova.virt.xenapi [-] Task
[Async.VM.snapshot] OpaqueRef:7ca66e5a-261e-5e7b-441e-dca99ab2a1a8
status: success
<value>OpaqueRef:05b68453-bee2-9c9b-db33-2bebe97cbdf7</value>
2011-09-20 18:11:36,361 DEBUG nova.virt.xenapi.vm_utils [-] Created
snapshot OpaqueRef:05b68453-bee2-9c9b-db33-2bebe97cbdf7 from VM
OpaqueRef:defbf1c9-f3e6-3822-f110-7b61a35b7c18. from (pid=20478)
create_snapshot
/usr/lib/pymodules/python2.7/nova/virt/xenapi/vm_utils.py:352
2011-09-20 18:11:36,361 DEBUG nova.virt.xenapi.vm_utils [-]
Re-scanning SR OpaqueRef:d02abfe8-c781-f49f-81b2-6b981ed98097 from
(pid=20478) scan_sr
/usr/lib/pymodules/python2.7/nova/virt/xenapi/vm_utils.py:804
2011-09-20 18:11:36,916 INFO nova.virt.xenapi [-] Task [Async.SR.scan]
OpaqueRef:9514755f-8b94-dea1-5c0b-689bbe282804 status: success
2011-09-20 18:11:36,940 DEBUG nova.virt.xenapi.vm_utils [-] VHD
9d2ec65d-aeb4-4e6c-811f-78111d5835fc has parent
OpaqueRef:1f83df6e-d9aa-90cb-e2d9-b3c672c7ec4d from (pid=20478)
get_vhd_parent /usr/lib/pymodules/python2.7/nova/virt/xenapi/vm_utils.py:840

and then the error that stops the task:

2011-09-20 18:12:28,311 DEBUG nova.manager [-] Notifying Schedulers of
capabilities ... from (pid=20478) periodic_tasks
/usr/lib/pymodules/python2.7/nova/manager.py:111
2011-09-20 18:12:28,312 DEBUG nova.rpc [-] Making asynchronous fanout
cast... from (pid=20478) fanout_cast
/usr/lib/pymodules/python2.7/nova/rpc/amqp.py:545
2011-09-20 18:12:28,312 INFO nova.rpc [-] Creating "scheduler_fanout"
fanout exchange
2011-09-20 18:12:28,737 INFO nova.virt.xenapi.vm_utils [-] (VM_UTILS)
xenserver vm state -> |Running|
2011-09-20 18:12:28,737 INFO nova.virt.xenapi.vm_utils [-] (VM_UTILS)
xenapi power_state -> |1|
2011-09-20 18:12:28,811 ERROR nova [-] in looping call
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE:   File "/usr/lib/pymodules/python2.7/nova/utils.py",
line 487, in _inner
(nova): TRACE:     self.f(*self.args, **self.kw)
(nova): TRACE:   File
"/usr/lib/pymodules/python2.7/nova/virt/xenapi_conn.py", line 408, in
_poll_task
(nova): TRACE:     name = self._session.xenapi.task.get_name_label(task)
(nova): TRACE:   File
"/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 229, in
__call__
(nova): TRACE:     return self.__send(self.__name, args)
(nova): TRACE:   File
"/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 133, in
xenapi_request
(nova): TRACE:     result = _parse_result(getattr(self,
methodname)(*full_params))
(nova): TRACE:   File "/usr/lib/python2.7/xmlrpclib.py", line 1224, in __call__
(nova): TRACE:     return self.__send(self.__name, args)
(nova): TRACE:   File "/usr/lib/python2.7/xmlrpclib.py", line 1575, in __request
(nova): TRACE:     verbose=self.__verbose
(nova): TRACE:   File "/usr/lib/python2.7/xmlrpclib.py", line 1264, in request
(nova): TRACE:     return self.single_request(host, handler,
request_body, verbose)
(nova): TRACE:   File "/usr/lib/python2.7/xmlrpclib.py", line 1289, in
single_request
(nova): TRACE:     self.send_request(h, handler, request_body)
(nova): TRACE:   File "/usr/lib/python2.7/xmlrpclib.py", line 1391, in
send_request
(nova): TRACE:     connection.putrequest("POST", handler,
skip_accept_encoding=True)
(nova): TRACE:   File "/usr/lib/python2.7/httplib.py", line 853, in putrequest
(nova): TRACE:     raise CannotSendRequest()
(nova): TRACE: CannotSendRequest
(nova): TRACE:

At the moment I'm stuck at this point.
Any idea about how to debug this error?

Thanks a lot
Giuseppe