Redistribute Exchange Databases
To redistribute Exchange databases so they are mounted on the Mailbox Server that holds the first activation preference, run the following:
1. Open up Exchange Management Shell
2. Change the directory to the Scripts folder located in the Exchange Install Directory;
Example: CD "C:\Program Files\Microsoft\Exchange Server\V14\Scripts"
3. Run the following command:
.\RedistributeActiveDatabases.ps1 -DagName <dagname> -BalanceDbsByActivationPreference –ShowFinalDatabaseDistribution –Confirm:$false
Note: To find the DagName, you can run the get-databaseavailabilitygroup powershell command to list your Dags.