If you are upgrading an existing domain controller or adding a new domain controller to an existing forest, review the next section to ensure the server meets disk space requirements.This section covers disk space requirements only for upgrading domain controllers from Windows Server 2008 or Windows Server 2008 R2 .Link Id=186394) in the Microsoft Knowledge Base as required.The minimum system requirements for Windows Server 2012 are listed in the following table.Taken together, the AD DS installation changes simplify the DC role installation process and reduce the likelihood of administrative errors, especially when you are deploying multiple domain controllers across global regions and domains.More detailed information on GUI and Windows Power Shell-based installations, including command line syntax and step-by-step wizard instructions, see Install Active Directory Domain Services.The Windows Power Shell-based AD DS Configuration Wizard automatically targets the schema and infrastructure master roles in the domains where DCs are being added, then remotely runs the required ADPREP commands on the relevant domain controllers.
Prior to the release of Windows 8, Windows Update managed its own internal schedule to check for updates, and to download and install them.
You can still add a domain controller that runs Windows Server 2012 R2 to an existing domain that has a Windows Server 2003 domain functional level; you just can't create a new domain at that level.
The following table summarizes the new features for AD DS in Windows Server 2012, with a link to more detailed information where it is available.
GUI-based promotions are performed in Server Manager using a completely new AD DS Configuration Wizard.
To simplify the installation process, ADPREP has been integrated into the AD DS installation and runs automatically as needed.
The Windows Server 2003 domain functional level is also deprecated because at the functional level, FRS is used to replicate SYSVOL.