Capacity
The capacity of the Active Directory infrastructure also affects the FSMO roles placement. When the number of users, devices, and other resources increases, it also increases FSMO role-related activities. If it's a multi-site environment, it's recommended that you place FSMO roles on sites that run with a high capacity of Active Directory objects in order to lower the impact of replication and latency issues.
FSMO role holders are also involved in typical Active Directory tasks such as user authentication. In large Active Directory environments (10,000+ objects), it is important to prioritize FSMO-related tasks over regular Active Directory tasks. This mainly impacts the PDC emulator as it is the most active FSMO role. It is possible ...
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