NCSA uses the Andrew File System (AFS) to maintain a single, consistent image of server information content across their server cluster. AFS provides a manageable, secure set of file namespace accessible to multiple client computers. These clients cache files locally, allowing a scalable sharing scheme that reduces network traffic and, in the case of high-performance clients, providing high-speed read/write access to file contents. Features of the management capability built into AFS could also prove useful in support of a wide-area distributed caching system.