To understand the need to transfer FSMO roles it is necessary to understand FSMO. As per Wikipedia – “Flexible Single Master Operations (FSMO) is a specialized domain controller (DC) set of tasks, used where standard data transfer and update methods are inadequate. Active Directory (AD) normally relies on multiple peer Domain Controllers, each with a copy of the AD database, being synchronized by multi-master replication. The tasks which are not suited to multi-master replication, and are viable only with a single-master database, are the FSMOs.”
When adding a new DC to a domain it often becomes the primary DC which means that a transfer FSMO roles will need to migrate. There are several ways to get this done, but this is by far the easiest I have found. Run the following PowerShell script from the new DC:
Move-ADDirectoryServerOperationMasterRole -Identity “[New DC Computer Name]” –OperationMasterRole PDCEmulator,RIDMaster,InfrastructureMaster,SchemaMaster,DomainNamingMaster
That command came from and special thanks go out to The Lazy Admin Blog.