Replication of Global Index Catalogs

Global index catalogs are held in memory and should therefore be replicated. This ensures redundancy and availability in your topology. A standard hardware load balancer can be used and replication of global index catalogs can be configured in a deployment as shown by the graphic in Multiple Replicated Proxies in Sun OpenDS Standard Edition 2.2 Deployment Planning Guide.

To have a replicated global index, you must use the following steps:

1. Install at least two instances of Sun OpenDS Standard Edition proxy in your server topology. For redundancy, it is recommended that these instances be on separate physical machines.

2. Configure a global index catalog for each instance of the Sun OpenDS Standard Edition proxy in your topology and add one or more global indexes.

   For more information on configuring a global index catalog with vdp-setup, see Creating Global Index Catalogs Using vdp-setup in Sun OpenDS Standard Edition 2.2 Installation Guide. For more information on configuring a global index catalog using the gicadm command, see To Create a Global Index Catalog Containing Global Indexes.

3. Run the gicadm enable-replication command. This command enables replication and also creates an administration user and password for future global index replication operations.

   The Sun OpenDS Standard Edition proxy instance whose global index catalog is to be replicated across the topology is referred to, for the purposes of CLI syntax, as the local instance, while the other instance of the Sun OpenDS Standard Edition proxy declared in the command is referred to as the remote instance. For more information on running the gicadm enable-replication command, see To Enable Global Index Catalog Replication.

4. Repeat the previous step as often as required to add the global index catalogs of all instances of Sun OpenDS Standard Edition proxy in the replication topology.

5. Choose an instance of Sun OpenDS Standard Edition proxy for the purposes of replication of the global index catalog, on which to initialize replication. Consider which instance of Sun OpenDS Standard Edition proxy has the most up to date global index catalog content, if any.

6. On the instance of Sun OpenDS Standard Edition proxy chosen in the previous step, run the gicadm initialize-replication command. For more information, see To Initialize Global Index Catalog Replication.

Note - When using a global index catalog with replicated remote LDAP servers, only one remote LDAP server must handle write operations if such operations can concurrently modify the same value and if that value is indexed. For this, you could set the add, delete and modify weights in your load balancing workflow element to direct all write traffic to the same server. For more information, see