The schema master role is not one that is used very often. Typically, the only time the schema master needs to be online after the initial installation of Active Directory is when you are making changes to the schema. When you are planning the placement of the schema master, place it in a site where the schema administrators have easy access to it. Also take into consideration the replication that will be incurred when a change is made. For this reason alone you may want to place the schema master within a site that has the most domain controllers within the forest.
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