John Wong, CTO, Twin Peaks Software Inc. Conventional file systems, whether local (UFS) or distributed (NFS), store files and directories on storage media managed by a single server in a single physical location. This single server file system model presents many limitations in terms of RAS, scalability, performance, and disaster recovery. The presentation will include: 1. Why we need Multiple Server File System. 2. How the Mirror File System (MFS) breaks the single server file system barrier. 3. The basic architecture of the MFS. 4. How the MFS works and interfaces with NFS, UFS and other file systems 5. How the MFS mount and umount functionality works. 6. How MFS's Vnode operations do the mirroring between files in two servers in real time. 7. How MFS's distributed locking mechanism ensures data coherence between mirrored copies of files on two servers. 8. Questions & Answers