I have a data migration to perform. I was wondering if anyone has done, or has had any issues with, a migration from 3.0.1 (standalone) to 3.1 (master).
It should work just fine. However, problems could always happen. After the migration, the DCR mode will be set back to standalone as the dcr.ini will be restored from the backup. You will need to reset it to master. In fact, I recommend you unregister all slaves from the master before doing the migration.