When upgrading Directory Server software to Java ES Release 5 you should take into account the following considerations:
In a deployment architecture in which there are multiple instances of Directory Server running on a single computer and all instances correspond to the same installed Directory Server image, upgrading the Directory Server image will upgrade all the instances. In such architectures, there is only one Administration Server instance per installed Directory Server image.
In many Release 4 deployment architectures the configuration directory is a separate Directory Server instance. These instances do not need to be upgraded because the configuration directory has been deprecated in Release 5. On the other hand, the upgrade might entail the deployment of the Release 5 Directory Server administrative console (the Directory Service Control Center) to a separate computer from which you remotely manage Directory Server instances.