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Siebel Installation Guide for UNIX > Requirements for Installing and Configuring Siebel Business Applications > Planning Your Siebel Deployment > Planning to Install Multiple Instances of Siebel Business ApplicationsThis topic is part of Planning Your Siebel Deployment. This topic describes issues in installing multiple instances of similar or dissimilar versions of Siebel Business Applications on the same computer. Installing Multiple Instances of Similar Versions of Siebel Business ApplicationsBy default, the Siebel installers automatically install Siebel Business Applications software in directories with unique names that will not conflict with other Siebel modules that you install on the same computer. To install another instance of the same version of a module on a single computer (where applicable), specify a custom installation path. However, installing multiple instances of some modules might cause problems. For example:
For important related considerations, see also About Installing Siebel Business Applications and Preparing the Hardware and Planning Topologies. NOTE: In this context, same version refers to all of the releases sharing the same first two digits, such as 8.1.1 and 8.1.1.11, or 8.2.2 and 8.2.2.4, and so on. All Siebel Enterprise Server components that you install on the same computer are installed into the same root directory (such as NOTE: If you have already installed Siebel Enterprise Server for the current release, and you require additional Siebel Enterprise Server components (for example, Siebel Gateway Name Server is already installed and you want to install a Siebel Server), then you can install a new instance, with the modules you require, in a different directory or on a different computer. (Then install the latest Siebel Patchset release for all of the applicable installed instances.) For more information about options in this situation, see General Requirements for Installing and Configuring Siebel Enterprise Server Components. Installing Multiple Instances of Dissimilar Versions of Siebel Business ApplicationsMultiple versions of Siebel components can be installed on the same computer. Sometimes you might have to do this as part of some upgrade scenarios. Use naming conventions for your installation directories that reflect the component and the version being installed, such as 81 or 82 for the current version. The default installation directories already reference Siebel CRM version 8.1 or version 8.2 in this way.
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