In a grid environment, it is often desirable to create remote, read-only copies (replicas) of files. Replication can be used to reduce access latency and improve data locality. Replica Location Service (RLS) is a system developed by the open source grid community to maintain and provide access to information about the physical locations of copies. Grid File Replication Manager builds on top of RLS to provide a Web-based tool for managing replicas on the grid.