Block device type for block_mapping_device is not configurable

[Denis M.]

Block device type for block_mapping_device is not configurable.

In code we're doing something like this:

 volume_info = {
'block_device': {'vdb': "%s:%s:%s:%s" % (volume.id '', volume.size, 1)},
'device_path': '/dev/vdb',
'mount_point': mount_point,
'volumes': [{'id': v_ref.id, 'size': v_ref.size}]
}

# <id>:[<type>]:[<size(GB)>]:[<delete_on_terminate>]
block_device_mapping = {'vdb': "%s:%s:%s:%s" % (volume.id, '', volume.size, 1)}

nova_client.servers.create(..., block_mapping_device=block_device_mapping)

As it can be seen, Trove hardcodes block device type to 'vdb' - it's only valid for "virtio", for example for iSCSI - sdb

And nova raises error - InvalidBDM: Block Device Mapping is Invalid

[Auston McReynolds (amcrn)]

bugs worth reading before making a decision: https://bugs.launchpad.net/nova/+bug/1246189 + https://bugs.launchpad.net/nova/+bug/1075971

[Denis M. (dmakogon)]

 Sure, we need to find out proper solution and see if nova can deal with it for us.