Hi, I noticed that expand/migrate/contract was revert in https://review.openstack.org/#/c/239922/ There is a new CMD 'online_data_migrations' was introduced to Nova and some data-migration scripts have been added. So I wonder will Nova keep expand the DB schema at beginning of live upgrade like before Or Nova have some new ways to handle DB Schema change? The upgrade doc was not update for a long time.... http://docs.openstack.org/developer/nova/upgrade.html Thanks a lot. Best Regards, Tan