Single Server Operations
Flexible Single Master Operations Roles (FSMO, sometimes pronounced "fizz-mo") operations are also known as operations master roles. Although domain controllers allow simultaneous updates in multiple places, certain operations are supported only on a single server. These operations are performed using the roles listed below:
| Role Name | Scope | Description |
|---|---|---|
| Schema Master | 1 per forest | Schema modifications |
| Domain Naming Master | 1 per forest | Addition and removal of domains if present in root domain |
| PDC Emulator | 1 per domain | Provides backwards compatibility for NT4 clients for PDC operations (like password changes). The PDC runs domain specific processes such as the Security Descriptor Propagator (SDPROP), and is the master time server within the domain. It also handles external trusts, the DFS consistency check, holds current passwords and manages all GPOs as default server. |
| RID Master | 1 per domain | Allocates pools of unique identifiers to domain controllers for use when creating objects |
| Infrastructure Master | 1 per domain/partition | Synchronizes cross-domain group membership changes. The infrastructure master should not be ran on a global catalog server (GCS) unless all DCs are also GCs, or the environment consists of a single domain. |
Read more about this topic: Active Directory
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