After you create a domain, you should create an additional domain controller in the domain to provide fault tolerance and load balancing for Active Directory.
To add a domain controller to an existing domain, run Dcpromo.exe to start the Active Directory Installation wizard. Complete the wizard by using the information in the following table.
| On this wizard page | Do this |
|---|---|
| Domain Controller Type | Click Additional domain controller for an existing domain. |
| Network Credentials | Specify the user name, password, and domain name of a user account that has rights to create domain controllers in Active Directory. |
| Additional Domain Controller | Specify the DNS name of the existing domain for which this computer will become an additional domain controller. |
| Database and Log Locations | Specify locations for the Active Directory database and log files. |
| Shared System Volume | Specify the location for the shared system volume. |
After you finish specifying the installation information, the Active Directory Installation wizard converts the computer to a domain controller, replicates Active Directory from an existing domain controller, converts the computer to a domain controller, and adds the Active Directory consoles to the Administrative Tools menu on that computer.