Contain user and configuration data for a single server.
Multiple server instances can reside on the same host.
Server instance location can be freely chosen. They can be separate from the installation-path.
Disk space occupied by a server instance is potentially unlimited.
For more information about server instances, see Chapter 2, Directory Server Instances and Suffixes, in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition and Chapter 17, Directory Proxy Server Instances, in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition.