How to Extend the Active Directory Schema for Configuration Manager

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http://technet.microsoft.com/en-us/library/bb633121.aspx
To extend the Active Directory schema using ExtADSch.exe

  1. Create a backup of the schema master domain controller’s system state using the NTBACKUP utility. To start the NTBACKUP utility, click Start, click Run and type ntbackup.
  2. Ensure that you are logged on to the schema master domain controller with an account that is a member of the Schema Admins security group.
    ImportantImportant
    You must be logged on as a member of the Schema Admins security group in order to successfully extend the schema. Running the ExtADSch.exe file using the Run As command to attempt to extend the schema using alternate credentials will fail. 

     

  3. Run extadsch.exe, located at \SMSSETUP\BIN\I386 on the installation media, to add the new classes and attributes to the Active Directory schema.
    noteNote
    Before you extend your Active Directory schema, test the schema extensions for conflicts with your current Active Directory schema. For information about how to test the Active Directory schema extensions, see Testing for Active Directory Schema Extension Conflicts. 

     

  4. Verify that the schema extension was successful by reviewing the extadsch.log located in the root of the system drive.
  5. If the schema extension procedure was unsuccessful, restore the schema master’s previous system state from the backup created in step 1. This will reverse the schema extension actions before reconnecting the schema master domain controller to the network.
    noteNote
    To restore the system state on a Windows domain controller, the system must be restarted in Directory Services Restore Mode. For more information about Directory Services Restore Mode, see Restart the Domain Controller in Directory Services Restore Mode Locally http://go.microsoft.com/fwlink/?LinkId=75622