1. Deploy the BBDW with Use Database Snapshots set to true (which will happen by default when Service Pack 11 is first installed, however a BBDW deploy/re-deploy will need to happen for these changes to take effect). This creates the necessary configuration files and environment variables. Note: The files/environment variables will still be created, even if the setting is changed to false in a future deployment. 

2. Update Custom Packages that write to OLTP to use the new configuration file, environment variable, and connection string. 

3. Run the ETL process.