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# System component considerations

The OpenText Enterprise Performance Engineering system includes several components. This section provides pre-installation considerations for each of the components. For system requirement details for each component, see the Support Matrix.

Component | Considerations
--- | ---
OpenText Enterprise Performance Engineering Server | Uninstall any 12.6x or earlier installations of the server from your machine. Also make sure that Network Virtualization was uninstalled, or uninstall it manually. You can install 26.1 as a full installation, or over an existing 2020 or later installation. If installing as a full installation, we recommend installing the server on a clean machine with a new image. If you are using Oracle Database and a version earlier than 24.3, you must upgrade the server to the current version and then upgrade all your projects. To upgrade projects, go to the Administration > Managements > Projects page. To install a server, you must have full local administrative rights on the designated machine. The server requires a specific Windows user to be defined on the machine. When using the default user or a custom local user, the user is created on the machine and is added to the Administrator group. Ensure that there is no security system in place that prevents creating the user or that removes the user from the Administrators group. For details on how to create this user, see Install and configure servers and hosts. Microsoft Windows Script Host must be version 5.6 or later. To verify the version number, go to the <Windows_installdir>\Windows\system32 directory. Right-click wscript.exe and select Properties. In the Version tab, verify the file version number. IIS: Before installing the server, you must install Microsoft Internet Information Services (IIS 10). Note: For better security, we recommend following the Microsoft IIS security best practices to harden your IIS web server. You must allow the relevant file extensions in IIS. To do this, open IIS Manager. Under the IIS section for the OpenText Enterprise Performance Engineering installations server application, open Request Filtering, click Edit Feature Settings, and clear Allow unlisted file name extensions so that only file extensions that are explicitly defined are used. Add the following to the list of allowed file extensions: : .ascx, .ash, .asmx, .aspx, .axd, .css, .eot, .gif, .html, .ico, .jpg, .jpeg, .js, .json, .map, .mjs, .otf, .png, .svg, .svc, .ttf, .woff, .woff2, .xml, and . (to include paths with no extension). During installation, some IIS features are updated on all servers using IIS. For example, Active Server Pages, ASP.NET 4.6 (IIS 10), ASP.NET 4.7 (IIS 10), Metabase, Static content, IIS 6.0 Management Compatibility, and Dynamic Compression are enabled, while URL Authorization is disabled. Oracle: Ensure that the Oracle client installed on the server is at least the same version as on the Oracle server, and that connectivity is established with the Oracle server. Only a 64-bit Oracle client installation is required. If you install the Oracle client after installing the server, you must restart the machine after installing the Oracle client. Oracle Monitoring: When defining Oracle monitors, install the server in a directory whose path does not include any of the following characters: ( ) : ; * \ / " ~ & ? { } $ % | < > + = ^ [ ]. For example, on a 64-bit machine, do not install the server in the default installation directory (C:\Program Files (x86)\....), as this path includes illegal characters. Compressed Oracle tables are not supported. If you have compression enabled, disable it before upgrading.
OpenText Enterprise Performance Engineering Host | To install a host, you must have full local administrative rights on the designated machine. The host requires a specific Windows user to be defined on the machine. This user is configured when adding the host to Administration. When using a default user or a custom local user, the user is created on the machine and added to the Administrator group. Ensure that there is no security system in place that prevents creating the user or removes the user from the Administrators group. For details on how to create this user, see Install and configure servers and hosts. The InfluxDB time series database is supported for storing data externally. This database is installed as part of the host installation.
Standalone Load Generator (Windows) | You cannot install the standalone load generator on the same machine as the OpenText Enterprise Performance Engineering server or host.
Standalone Load Generator (Linux) | You can install the standalone load generator on Linux to run Vusers. The Linux Vusers interact with the Controller that is installed on a Windows machine. For details, see Install a load generator on Linux.
MI Listener | The MI Listener must be installed on a standalone machine. The MI Listener cannot be installed on a machine running IIS.
Monitor Over Firewall Machine | The Monitor Over Firewall agent must be installed on a standalone machine.
SiteScope Server | SiteScope is used for monitoring applications. Refer to the SiteScope Deployment Guide for minimum requirements.

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