Configuring the Backup Domain Controller
In your transport domain, the SAP System that is configured as the domain controller is of special significance. If this SAP System fails, you cannot make changes to the TMS configuration during this time. Therefore if your transport domain contains more than three SAP Systems, we recommend configuring a backup domain controller. If your domain controller fails, the backup controller can assume the function of the domain controller.
The SAP System that you want to use as the backup controller must have the same release version as the domain controller. Otherwise, configuration information may be lost when changing the transport domain controller.
To configure a backup domain controller: