nova resize问题

执行 nova resize test m2.tiny时，nova-conductor日志，麻烦帮忙诊断下，或者给个解决问题的思路

2015-04-30 08:39:35.770 30644 INFO oslo.messaging._drivers.impl_rabbit [-] Connected to AMQP server on 192.168.8.231:5672
2015-04-30 08:39:40.160 30644 INFO oslo.messaging._drivers.impl_rabbit [-] Connected to AMQP server on 192.168.8.231:5672
2015-04-30 08:39:55.339 30644 ERROR glanceclient.common.http [-] Request returned failure status.
2015-04-30 08:39:55.339 30644 WARNING nova.compute.utils [req-e361246d-88e9-4427-b057-1769d95c6d7a 6bdd4e3dc8ee43c390043691964e0a5a 6cadfd283253409d8cdbad8c80469a4e] [instance: 8c61e98b-6f0f-4895-9145-c83f9da1ec06] Can't access image : Image  could not be found.
2015-04-30 08:39:55.366 30644 INFO oslo.messaging._drivers.impl_rabbit [-] Connected to AMQP server on 192.168.8.231:5672
2015-04-30 08:39:55.495 30644 WARNING nova.scheduler.utils [req-e361246d-88e9-4427-b057-1769d95c6d7a 6bdd4e3dc8ee43c390043691964e0a5a 6cadfd283253409d8cdbad8c80469a4e] Failed to compute_task_migrate_server: No valid host was found.
Traceback (most recent call last):

  File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/server.py", line 139, in inner
    return func(*args, **kwargs)

  File "/usr/lib/python2.6/site-packages/nova/scheduler/manager.py", line 298, in select_destinations
    filter_properties)

  File "/usr/lib/python2.6/site-packages/nova/scheduler/filter_scheduler.py", line 140, in select_destinations
    raise exception.NoValidHost(reason='')

NoValidHost: No valid host was found.

2015-04-30 08:39:55.496 30644 WARNING nova.scheduler.utils [req-e361246d-88e9-4427-b057-1769d95c6d7a 6bdd4e3dc8ee43c390043691964e0a5a 6cadfd283253409d8cdbad8c80469a4e] [instance: 8c61e98b-6f0f-4895-9145-c83f9da1ec06] Setting instance to ACTIVE state.
2015-04-30 08:39:55.597 30644 WARNING nova.conductor.manager [req-e361246d-88e9-4427-b057-1769d95c6d7a 6bdd4e3dc8ee43c390043691964e0a5a 6cadfd283253409d8cdbad8c80469a4e] [instance: 8c61e98b-6f0f-4895-9145-c83f9da1ec06] No valid host found for cold migrate.