Unable to determine disk prefix for None [closed]

asked 2013-08-16 14:59:54 -0600

mnzaki gravatar image

I'm on Ubuntu 13.04 using nova version 2013.1.2 I'm testing out openstack on a single node. When I try to boot an instance I'm faced with this in the logs:

Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1104, in _spawn block_device_info) File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1515, in spawn image_meta) File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/blockinfo.py", line 441, in get_disk_info image_meta, rescue) File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/blockinfo.py", line 358, in get_disk_mapping root_device_type) File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/blockinfo.py", line 284, in get_next_disk_info last_device) File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/blockinfo.py", line 161, in find_disk_dev_for_disk_bus dev_prefix = get_dev_prefix_for_disk_bus(bus) File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/blockinfo.py", line 131, in get_dev_prefix_for_disk_bus disk_bus) NovaException: Unable to determine disk prefix for None

Any hints on what this can mean? Is it a bug or a misconfiguration?

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Closed for the following reason the question is answered, right answer was accepted by koolhead17
close date 2014-06-05 21:18:23.007824

2 answers

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answered 2013-08-16 16:48:36 -0600

mnzaki gravatar image

Apologies, after going through everything again I realized libvirt_type was being overridden in nova-compute.conf with a bad value due to my configuration system.

As a note, why does nova not complain when the configuration is clearly broken?

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answered 2013-08-16 16:35:23 -0600

gtt116 gravatar image

Hi Mina,

Can you show up you nova.conf content? especially the config item libvirt_type.

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Asked: 2013-08-16 14:59:54 -0600

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Last updated: Aug 16 '13