System Administration IBM HTTP Server documentation
Pertains to Windows users

Setting up the Fast Response Cache Accelerator

Pertains to AIX users

This section describes tuning tips to help improve the performance of your server using the Fast Response Cache Accelerator (FRCA), referred to as the Cache Accelerator. The Cache Accelerator is available only on Windows operating systems. Not all tips have been tested, nor will all tips have the same impact in all environments. Use your judgment when deciding which tips to implement on your server. Make a backup copy of your server configuration file, before making any modifications. Links to related topics appear at the end of this section.

Customizing cache management with the Cache Accelerator

The Cache Accelerator can improve the performance of the IBM HTTP Server when serving static content, such as text and image files.

Because the Cache Accelerator cache automatically loads during server operation, you do not have to list the files to cache in your server configuration file. The server automatically caches changed pages again and removes outdated pages from the cache.

The Cache Accelerator supports servers with multiple IP addresses. Currently, support is not available for running the Cache Accelerator on a proxy server.

Enabling and configuring the Cache Accelerator

By default, the IBM HTTP Server enables the Cache Accelerator. To disable the Cache Accelerator, remove or comment out the AfpaEnable and AfpaCache directives using the Administration Server.

Customizing logging for the Cache Accelerator

By default, the Cache Accelerator records that a Web browser has accessed a cached file. If you do not need this access logging, turn the logging off for better server performance. To set Cache Accelerator logging off, edit the httpd.conf configuration file and insert a comment character (#) at the beginning of the AfpaLogFile line.

Enabling high speed caching of servlets and JavaServer Pages files

You can use the IBM HTTP Server Cache Accelerator in conjunction with WebSphere Application Server to cache certain dynamically generated servlet and JavaServer Pages (JSP) files. For details on how to enable this capability, see the External Caching description in the WebSphere Application Server InfoCenter documentation. Follow the instructions for adding the Afpa adapter bean and for configuring cacheable servlets and JSPs.

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