[AIX][Windows]

Customizing Fast Response Cache Accelerator logging

The fast response cache accelerator (FRCA) can improve the performance of the IBM HTTP Server when serving static content, such as text and image files. By default, FRCA generates an access log of all requests that are served out of the cache. In order to minimize the effect of logging on performance, this is a separate file from the normal Apache access log.

Before you begin [Fix Pack 9 or later]

[This information only applies to Version 6.1.0.9 and later running on the Microsoft Windows Vista operating system.] [Fix Pack 9 or later] Restriction on using the fast response cache accelerator (FRCA) on the Microsoft® Windows Vista™ operating system: The FRCA, which is based on the IBM Advanced Fast Path Architecture (AFPA), is not supported on the Microsoft Windows Vista operating system. IBM HTTP Server will fail to start if the FRCA is enabled in the configuration file. This is a permanent restriction.

About this task

When FRCA is enabled, the default configuration setting allows all static files to be cached. The cache automatically loads during server operation so that individual files do not need to be listed. Use the AfpaCache directive to turn caching on or off for specific directories.

FRCA will remove files from the cache when they change to avoid serving stale content.

Enable the FRCA access log if you want to maintain a record of requests served by FRCA. Requests that are not served out of the cache will be logged in the FRCA access log file. The FRCA access log file provides a useful way to verify that caching is enabled and to identify cached files.

Note: Even though a particular file might be cached, it might not always be served from the cache. Therefore, not every request for a cached file will result in an FRCA access log entry.

If you do not need access logging, turn the logging off for better performance.

Procedure




Related reference
AFPA directives
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Last updatedLast updated: Aug 31, 2013 6:08:30 AM CDT
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