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Sun OpenDS Standard Edition 2.0 Architectural Reference

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The Directory Server Access Control Model

Understanding the Directory Server Schema

Index Databases

Understanding Directory Server Plug-Ins

Directory Server Replication

Overview of the Directory Server Replication Architecture

Basic Replication Architecture

Replication Servers

Replication Change Numbers

Replication Server State

Operation Dependencies

How Replication Works

Directory Server Change Processing

Change Replay

Auto Repair

Directory Server Crashes

Replication Server Crashes

Historical Information and Conflict Resolution

What is a Replication Conflict?

Resolving Modify Conflicts

Resolving Naming Conflicts

Purging Historical Information

Schema Replication

Schema Replication Architecture

Replication Status

Replication Status Definitions

Degraded Status

Full Update Status and Bad Generation ID Status

Replication Groups

Replication Server Selection

Replication Groups in a Multi-Data Center Deployment

Assured Replication

Assured Replication Modes

Safe Data Mode

Safe Read Mode

Safe Read Mode and Replication Groups

Assured Replication Connection Algorithm

Assured Replication and Replication Status

Assured Replication Monitoring

Root Users and the Privilege Subsystem

Supported Controls and Operations

Auto Repair

Despite efforts to keep servers in sync, directory servers can begin to show incoherent data. Typically, this occurs in the following circumstances:

In such cases, tracking and replaying changes is not sufficient to synchronize the incoherent data.

An automatic repair mechanism is provided, which leverages historical information inside entries to determine what the coherent data should be. The replication mechanism then repairs the data on directory servers where the data is bad or missing. The auto repair mechanism is implemented as an LDAP application, and runs on the hosts that run replication servers.

The auto repair application can run in different modes. Depending on the mode in which it is run, the auto repair application performs the following tasks:

Note - In the current directory server release, the auto repair mechanism must be run manually. For more information, see Detecting and Resolving Replication Inconsistencies in Sun OpenDS Standard Edition 2.0 Administration Guide.