Public bug reported:
When creating an instance backed by a cinder volume, the disk device /dev/vda
is used regardless of image settings. I am using the following image metadata
to set virtio-scsi driver on my instances:
hw_disk_bus=scsi
hw_scsi_model=virtio-scsi
When I boot instances using a normal root device ("boot from image"),
they are using /dev/sda and virtio-scsi as expected. When booting from
volume (either with a new volume or an existing image-based volume),
they use "<target dev='vda' bus='virtio'/>", ignoring the image
metadata.
According to this spec: http://specs.openstack.org/openstack/nova-
specs/specs/juno/approved/add-virtio-scsi-bus-for-bdm.html
A "work item" was: "Nova retrieve “hw_scsi_model” property from volume’s
glance_image_metadata when booting from cinder volume"
I would expect this work is what would implement setting virtio-scsi on
volume backed instances, however none of the reviews I have looked
through for that spec appear to implement anything regarding volume
backed instances.
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1489194
Title:
hw_scsi_model from glance image is not used when booting instance from
new volume
Status in OpenStack Compute (nova):
New
Bug description:
When creating an instance backed by a cinder volume, the disk device /dev/vda
is used regardless of image settings. I am using the following image metadata
to set virtio-scsi driver on my instances:
hw_disk_bus=scsi
hw_scsi_model=virtio-scsi
When I boot instances using a normal root device ("boot from image"),
they are using /dev/sda and virtio-scsi as expected. When booting from
volume (either with a new volume or an existing image-based volume),
they use "<target dev='vda' bus='virtio'/>", ignoring the image
metadata.
According to this spec: http://specs.openstack.org/openstack/nova-
specs/specs/juno/approved/add-virtio-scsi-bus-for-bdm.html
A "work item" was: "Nova retrieve “hw_scsi_model” property from
volume’s glance_image_metadata when booting from cinder volume"
I would expect this work is what would implement setting virtio-scsi
on volume backed instances, however none of the reviews I have looked
through for that spec appear to implement anything regarding volume
backed instances.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1489194/+subscriptions
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