Characteristics of This Scenario

• Server downtime is minimized. At any given time, most servers are running and available.

• Most of the LDAP directory is available to the servers and for provisioning.

• You migrate the LDAP directory in stages, selecting individual domains for migration.

• The overall migration time is extended.

• While the directory is in Schema 2, compatibility mode:

  • User-developed applications can continue to use the LDAP directory exactly as if it were still in Schema 1.

  • Messaging and Calendar servers can continue to use the directory exactly as if it were Schema 1.

  • User-developed provisioning tools that rely on Schema 1 can only work on existing directory data.

  This migration process is the most complex of the scenarios; it is more complex than a direct migration to Schema 2, native mode, or an incremental migration to native mode. The schema migration must be performed twice.

For a discussion of the conditions best suited for migrating your installation incrementally, see Deployments Suitable for Incremental Migration.