A simple replicated (mirroring) file system. This file system will use several file systems assumed to be ``identical.'' Reading operations will be sent to any of the replicas, presumably whichever is the most available at the moment. Writing operations will be performed on all replicas, to ensure consistency. The Statefs file system will be used to store state useful for recovery such as partial write failures, which replicas have the latest versions of the same file, etc.