If you want to install your eDirectory tree on more than three NOWS servers, you must manually configure a read/write replica of eDirectory for each additional NOWS server.
For background information about eDirectory tree replication, see Guidelines for Replicating Your Tree
Be sure to install iManager before you attempt to replicate your eDirectory tree. For information about installing iManager, see Section 4.0, Management Tools (iManager).
To replicate your eDirectory tree, see the “Administering Replicas,” “Setting Up and Managing Filtered Replicas,” and “Viewing Partitions and Replicas” subsections in the eDirectory 8.8 Administration Guide