Grid systems can greatly facilitate user collaborations by seamlessly enabling the sharing of data.  In general, grid systems are dynamic collections of distriburted resources.  By harnessing resources and making them accessible to users and applications, grids enable large-scale resource-intensive, and distributed computing.  Yet, grids are not just virtual platforms for computation.  They provide a useful mechanism for the management and sharing of distributed data.

Classically, the manipulation of distributed data can be enhanced with the use of replication.  The primary reasons for replicating data focus on increasing reliability and improving performance.  Our work has focused around developing a replication scheme that would achieve these enhancements in the Genesis II project, a standards-based, open-source grid platform.  We present the design and performance of our implementation for transparently replicating shared directories in a grid system.