Enable replication (Server B to Server A).
Start production users on version 15.0 (Server B).
If you perform an in-place upgrade, so that the older
versions of the databases no longer exist, you must create a new
Adaptive Server installation for your older server.
If you created a new installation and migrated data using dump and load or similar commands, start the old version of Adaptive Server on the old installation. You may need to use bcp out to copy changed data from 15.0 server back to the older server.
