Comment 14 for bug 1556819

Can reproduce on Lab:
Controller+Mongo, Compute+LVM, Ironic

2016-05-11 14:53:13.959 13173 ERROR nova.scheduler.utils [req-2e695f62-8fc4-4993-8f02-895fb6a35f4e fa10c65c31e3438592813bcda8e0901c 56c4235eb070458b98124f05d30dc6ef - - -] [instance: 18b96cbe-be34-43f0-a5c0-8486727064c7] Error from last host: node-6.test.domain.local (node node-6.test.domain.local): [u'Traceback (most recent call last):\n', u' File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1926, in _do_build_and_run_instance\n filter_properties)\n', u' File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2116, in _build_and_run_instance\n instance_uuid=instance.uuid, reason=six.text_type(e))\n', u'RescheduledException: Build of instance 18b96cbe-be34-43f0-a5c0-8486727064c7 was re-scheduled: partition search unsupported with nbd\n']
2016-05-11 14:53:14.075 13172 DEBUG oslo_messaging._drivers.amqpdriver [req-2e695f62-8fc4-4993-8f02-895fb6a35f4e fa10c65c31e3438592813bcda8e0901c 56c4235eb070458b98124f05d30dc6ef - - -] REPLY msg_id: 7b5c5ab3686c4924addebfb136c39293 size: 146 reply queue: reply_de8bd1844e2141aba910eac76d7c721b time elapsed: 0.193683430996s _send_reply /usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py:96
2016-05-11 14:53:14.125 13173 DEBUG oslo_messaging._drivers.amqpdriver [req-2e695f62-8fc4-4993-8f02-895fb6a35f4e fa10c65c31e3438592813bcda8e0901c 56c4235eb070458b98124f05d30dc6ef - - -] CALL msg_id: b1aec354709b4c008a26a8600b0e785c size: 5682 exchange: nova topic: scheduler _send /usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py:496
2016-05-11 14:53:14.210 13173 DEBUG oslo_messaging._drivers.amqpdriver [-] received reply msg_id: b1aec354709b4c008a26a8600b0e785c size: 1077 __call__ /usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py:339
2016-05-11 14:53:14.211 13173 WARNING nova.scheduler.utils [req-2e695f62-8fc4-4993-8f02-895fb6a35f4e fa10c65c31e3438592813bcda8e0901c 56c4235eb070458b98124f05d30dc6ef - - -] Failed to compute_task_build_instances: No valid host was found. There are not enough hosts available.
Traceback (most recent call last):

  File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 150, in inner
    return func(*args, **kwargs)

  File "/usr/lib/python2.7/dist-packages/nova/scheduler/manager.py", line 104, in select_destinations
    dests = self.driver.select_destinations(ctxt, spec_obj)

  File "/usr/lib/python2.7/dist-packages/nova/scheduler/filter_scheduler.py", line 74, in select_destinations
    raise exception.NoValidHost(reason=reason)

NoValidHost: No valid host was found. There are not enough hosts available.

2016-05-11 14:53:14.212 13173 WARNING nova.scheduler.utils [req-2e695f62-8fc4-4993-8f02-895fb6a35f4e fa10c65c31e3438592813bcda8e0901c 56c4235eb070458b98124f05d30dc6ef - - -] [instance: 18b96cbe-be34-43f0-a5c0-8486727064c7] Setting instance to ERROR state.