Two schema options are available and supported with Messaging Server: Sun Java System LDAP Schema version 1 and Sun Java System LDAP Schema version 2.
See the Sun Java System Communications Services 6 2005Q4 Schema Migration Guide for information on how to migrate from Sun Java System LDAP Schema version 1 to Sun Java System LDAP Schema version 2.
Are you installing Messaging Server for the first time or are you upgrading from an older version?
If you are installing Messaging Server for the first time, use Schema 2.
If you are upgrading from an older version of Messaging Server, you can either use Schema 1 or Schema 2.
LDAP Schema 1 is a provisioning schema that consists of both an Organization Tree and a DC Tree. This set of schema (at the time, it was simply called “schema”) was supported in previous Messaging Server 5.x versions.
In Schema 1, when Messaging Server searches for user or group entries, it looks at the user's or group’s domain node in the DC Tree and extracts the value of the inetDomainBaseDN attribute. This attribute holds a DN reference to the organization subtree containing the actual user or group entry.
Only sites that have installed previous versions of Messaging Server should use Schema 1.
Migrating to Schema 2 is imperative if you plan to install Messaging Server with other Sun Java System products in the future.
Schema 1 supports Sun ONE Delegated Administrator for Messaging (formerly called iPlanet Delegated Administrator) as well as LDAP provisioning tools. For more information, see Understanding Provisioning Tools.
The native mode uses search templates to search the LDAP directory server. Once the domain is found by using the domain search template, the user or group search templates are used to find a specific user or group.
You should use native mode if you are installing Communications Suite for the first time and you do not have other applications on your machine that are dependent on a two-tree provisioning model. You should also use this mode if you want to install other products in the Java Enterprise System product suite.
If you have an existing Communications Suite 5.x installation that uses Schema 1, and you want to integrate Communications Suite with other Java Enterprise Server products, you should migrate your directory to Schema 2 after you upgrade to Communications Suite 6. Refer to the Sun Java System Communications Services 6 2005Q4 Schema Migration Guide for information on how to migrate from LDAP Schema version 1 to LDAP Schema version 2.
Schema 2 Native Mode is the recommended provisioning model for all Sun Java System products in the Java Enterprise System product suite.
Schema 2 supports Sun Java System Delegated Administrator. For more information, see Understanding Provisioning Tools.
Schema 2 compatibility mode is an interim mode between Schema 1 and Schema 2 native mode. Schema 2 compatibility mode supports both schemas and enables you to retain the existing two-tree design you already have. Schema 2 compatibility mode also assumes that you have installed Access Manager prior to installing Messaging Server.
Use Schema 2 Compatibility if you have existing applications that require Schema 1, but you also need functionality that requires Schema 2, for example, Access Manager, single sign-on, and so forth.
Schema 2 compatibility mode is provided as a convenience in migrating to the Schema 2 Native mode. Do not use Schema 2 compatibility mode as your final schema choice. The migration process from Schema 1 to Schema 2 compatibility mode and then finally to Schema 2 native mode is more complex that simply migrating from Schema 1 to Schema 2 native mode. See the Sun Java System Communications Services 6 2005Q4 Schema Migration Guide for more information.