The 'Boot from image (creates a new volume)' code path uses the new block_device_mapping_v2 api. This is most likely a bug in the implementation of this in nova that affects all volumes backends, not just rbd.
The 'Boot from image (creates a new volume)' code path uses the new block_device_ mapping_ v2 api. This is most likely a bug in the implementation of this in nova that affects all volumes backends, not just rbd.