The default installation paths which the installation wizard uses to install WebSphere ESB and WebSphere Application Server Network Deployment,Version 6.0.2, can be different depending on whether you install the product on a clean server or on one with an existing installation of WebSphere Application Server or WebSphere Application Server Network Deployment.
The variableinstall_root is used throughout the documentation to refer to the installation location of WebSphere ESB. WebSphere ESB will always be installed in the same location as the WebSphere Application Server Network Deployment installation with which it is associated.