Sun Java System Communications Services 6 2005Q4 Schema Migration Guide

Cross-Domain Deployment—Not Recommended for Incremental Migration

If all the servers in your installation manage across domain boundaries (if multiple servers share access to each domain), your installation might not be a good candidate for incremental migration.

For example, suppose your installation contains two back-end servers in the following configuration:

This installation should migrate directly (both servers, the entire LDAP directory), not incrementally.