1. Deploy the BBDW with Use Database Snapshots set to true (which will happen by default when Service Pack 11 is first installed). 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.