This article outlines best practices for conversions of Windows 2000, 2003 and 2008 Active Directory domain controller conversions (P2V, P2P, V2V & V2P).
Inside an active directory tree, there are no longer Primary Domain Controllers (PDC) and Backup Domain Contollers (BDC). Instead, all machines are classified as Domain Contollers, with 5 FSMO roles. These roles cover the functions of Schema Master, Domain naming master, Infrastructure Master, Relative ID (RID) Master, and PDC Emulator. Each of these five roles can be split up and loaded onto multiple machines, or assigned to one machine.
When converting an Active Directory domain controller in a Windows 2000, 2003 or 2008 domain with more than one domain controller, best practices dictate that the Domain Administrator should move all the FSMO roles on the machine that is being migrated to another domain controller. This will allow all the remaining domain controllers to maintain the active synchronization and prevents any negative impact on the performance or stability of the domain during the migration.
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For additional information, please refer to the following Microsoft KB articles regarding moving FSMO roles between domain controllers: