Following are some considerations to take into account for large directories or when a directory service needs to be available at multiple locations possibly involving local administration authority without reliable network connections in between. There are, generally, two ways to distribute a directory:
Split Namespaces – Each server only stores a subset (partition) of the whole namespace. All servers together build up the entire namespace.
Replication – Each server stores the whole namespace. One server is a master while all others are exact replicas of the master.
The major reason for replication is load balancing and availability. See 7.6, “Replication” on page 178 for more details. The following ...