So, the Kilo release notes say: nova-manage migrate-flavor-data But nova-manage says: nova-manage db migrate_flavor_data But that says: Missing arguments: max_number And the help says: usage: nova-manage db migrate_flavor_data [-h] [–max-number <number>] Which indicates that –max-number is optional, but whatever, so you try: nova-manage db migrate_flavor_data –max-number 100 And that says: Missing arguments: max_number So just for kicks you try: nova-manage db migrate_flavor_data –max_number 100 And that says: nova-manage: error: unrecognized arguments: –max_number So finally you try: