Siebel Installation Guide for Microsoft Windows: Servers, Mobile Web Clients, Tools > Preparing for Installation > General Considerations in Planning Your Siebel Deployment >

Installing Multiple Instances of Siebel Business Applications

This section describes issues in installing multiple instances of similar or dissimilar versions of Siebel Business Applications on the same machine.

Installing Multiple Instances of Similar Versions of Siebel Business Applications

By default, the Siebel installers automatically install Siebel software in unique directories that will not conflict with other Siebel software components, of the same or different versions, that you install on the same machine.

For related considerations, see also Planning Topologies. See also About Installing Siebel Releases.

To install another instance of the same version of a product on a single machine, specify a custom installation path. However, you cannot install multiple instances of the same version of Siebel Gateway Name Server on the same machine.

NOTE:  In this context, same version refers to all releases sharing the same first two digits—such as 7.8.1, 7.8.2, and so on. Each product instance of the same version would be installed to the same default installation path, unless you specify a custom path. A release can be installed as a maintenance release if the prior release of the same series is already installed. For example, if available, 7.8.3 could be installed as a maintenance release if 7.8.2 is already installed.

Subcomponents of the Siebel Enterprise Server that are installed on the same machine must be installed into the same root directory. The subcomponents are Siebel Gateway Name Server, Siebel Server, Siebel Database Server, and EAI connectors. See also File and Directory Naming Conventions.

NOTE:  You cannot install additional subcomponents into a root directory after applying a patch. You can install additional languages into a root directory after applying a patch, but you must reapply the patch afterwards.

Installing Multiple Instances of Dissimilar Versions of Siebel Business Applications

Multiple versions of some Siebel components can be installed on the same machine. Sometimes you may need to do this as part of some upgrade scenarios. For more information about upgrading, see the Upgrade Guide.

You should use naming conventions for your installation directories that reflect the component and the version number being installed (the default installation directories already do this).

• Each Siebel Gateway Name Server must be installed on a separate machine, regardless of the version.

  For installation instructions, see Installing the Siebel Gateway Name Server.

• If you install multiple versions of the Siebel Server on the same machine, you must install them in different directories (the default installation directories already do this).

  For installation instructions, see Installing the Siebel Server.

• If you install multiple versions of the Siebel Web Server Extension (SWSE) on the same machine, you must install them in different directories (the default installation directories already do this).

  CAUTION:  Before you install SWSE in such a scenario, you must take steps described in Technical Note 456 on Siebel SupportWeb. For more information, see SWSE Installation Requirements, part of Installing the Siebel Web Server Extension.