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In a forest, there are at least five FSMO - Flexible single master operation roles (Operation master Role) that are assigned to one or more domain controllers. The five FSMO roles are

  1. Schema Master: The schema master domain controller controls all updates and modifications to the schema. To update the schema of a forest, you must have access to the schema master. There can be only one schema master in the whole forest.

  2. Domain naming master: The domain naming master domain controller controls the addition or removal of domains in the forest. There can be only one domain naming master in the whole forest.

  3. Infrastructure Master: The infrastructure is responsible for updating references from objects in its domain to objects in other domains. At any one time, there can be only one domain controller acting as the infrastructure master in each domain.

  4. Relative ID (RID) Master: The RID master is responsible for processing RID pool requests from all domain controllers in a particular domain. At any one time, there can be only one domain controller acting as the RID master in the domain.

  5. PDC Emulator: The PDC emulator is a domain controller that advertises itself as the primary domain controller (PDC) to workstations, member servers, and domain controllers that are running earlier versions of Windows. For example, if the domain contains computers that are not running Microsoft Windows XP Professional or Microsoft Windows 2000 client software, or if it contains Microsoft Windows NT backup domain controllers, the PDC emulator master acts as a Windows NT PDC. It is also the Domain Master Browser, and it handles password discrepancies. At any one time, there can be only one domain controller acting as the PDC emulator master in each domain in the forest.

TRANSFER THE SCHEMA MASTER ROLE

Before transferring the schema master role must be resister “Schmmgmt.dll” file

Register Schmmgmt.dll

  1. Click Start, and then click Run.

  2. Type regsvr32 schmmgmt.dll in the Open box, and then click OK.

  3. Click OK when you receive the message that the operation succeeded.

Transfer the Schema Master Role

  1. Click Start, click Run, type mmc in the Open box, and then click OK.

  2. On the File, menu and click Add/Remove Snap-in.

  3. Click Add.

  4. Click Active Directory Schema, click Add, click Close, and then click OK.

  5. In the console tree, right-click Active Directory Schema, and then click Change Domain Controller.

  6. Click Specify Name, type the name of the domain controller that will be the new role holder, and then click OK.

  7. In the console tree, right-click Active Directory Schema, and then click Operations Master.

  8. Click Change.

  9. Click OK to confirm that you want to transfer the role, and then click Close.

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