CM Server is a J2EE application that runs within a WebSphere® Application Server Java™ process. The ClearCase® and ClearQuest® RPC servers must be on the same machine as WebSphere Application Server. You can install the traditional ClearCase servers (VOB and registry servers) and the ClearQuest database servers on another host but Rational® ClearCase and Rational ClearQuest must be installed on all machines on which RPC servers are running. Some sites might need to access CM Server by proxy or redirection from another WAN server (for example, if CM Server is deployed in a distributed environment or in an environment that includes more than one server machine.)
There are differences between installing CM Server into an existing WebSphere Application Server instance and creating a new WebSphere Application Server instance during the installation.