What is FSMO?

Short for Flexible Single Master Operations, it is a feature of Microsoft's Active Directory. The schema master FSMO role holder is the domain Controller responsible for performing updates to the directory schema.

Flexible single master operation (FSMO, F is sometimes floating ; pronounced Fiz-mo), or just single master operation or operations master, is a feature of Microsoft's Active Directory (AD). Recently, as of 2005, the term FSMO has being depreciated in favour of operations masters.

FSMOs are specialised domain controller (DC) tasks, used where standard data transfer and update methods are inadequate. AD normally relies on multiple peer DCs, each with a copy of the AD database, being synchronised 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.

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