This displays the maximum age of a valid cache entry. The parameter controls how long cached information is used after a file has been cached. An entry older than the maximum age is replaced by a new entry for the same file.
If your web site’s content changes infrequently, you may want to increase this value for improved performance. You can set the maximum age by:
Entering or changing the value in the Maximum Age field of the File Cache Configuration page in the Server Manager.
Editing the MaxAge parameter in the nsfc.conf file. For more information about this file, see the Sun Java System Web Server 6.1 SP6 Administrator’s Configuration File Reference.