Comment 4 for bug 1822613

For the --max-count batch size issue, I think you might be looking for something like this:

https://review.openstack.org/#/c/378718/

Where archive_deleted_rows takes a batch size and an option to run until complete. The online_data_migration command doesn't really work that way - it either runs in batches of 50 until complete, or if you specify your own --max-count it only processes that many and stops.