Cannot start up devices

@kay wrote:

Hi,

when i build a topology i cannot start up the devices, i get the following error messages in red for all my devices in the topology:

ERROR) [Jan/16/2016 14:48:00] Node "iosv-1" state changed from ABSENT to ERROR with message: No valid host was found. Exceeded max scheduling attempts 3 for instance abc08768-5653-4884-87c7-d4dd7a6b5a45. Last exception: [u'Traceback (most recent call last):\n', u' File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2248, in do: File "/usr/lib/python2.7/dist-packages/nova/conductor/manager.py", line 669, in buildinstances
(ERROR) [Jan/16/2016 14:48:00] Node "iosv-2" state changed from ABSENT to ERROR with message: No valid host was found. Exceeded max scheduling attempts 3 for instance 4f1ccbd2-f165-4936-b27e-41472c9fcfd1. Last exception: [u'Traceback (most recent call last):\n', u' File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2248, in _do: File "/usr/lib/python2.7/dist-packages/nova/conductor/manager.py", line 669, in build_instances

what could be wrong and where do i begin to troubleshoot?

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