Metadata Synchronization in a Rack-Mounted Directory Server Environments

In a rack-mounted directory server environment, it is necessary to synchronize the metadata--for example, definitions of object classes, attributes, matching rules, ACPs, and password policies--on all the directory server nodes. Figure 27-3 and the accompanying text exemplify the process in which directory server metadata is synchronized between two directory server nodes, Host A and Host B, in a rack-mounted environment.

Figure 27-3 Metadata Synchronization Process in Rack-Mounted Environments

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In the example in Figure 27-3, metadata in a rack-mounted environment is synchronized as follows:

1. On Host A, the directory server writes metadata changes to the shared memory on that same host.

2. OID Monitor on Host A polls the shared memory on that same host. When it discovers a change in the metadata, it retrieves the change.

3. OID Monitor sends the change to the Oracle9i Database Server, which is the repository for the directory server metadata in the rack-mounted environment.

4. OID Monitor on Host B polls Oracle9i Database Server for changes in directory server metadata, and retrieves those changes.

5. OID Monitor on Host B sends the change to the shared memory on that same host.

6. The directory server on Host B polls the shared memory on that same host for metadata changes. It then retrieves and applies those changes.