Implementation of the Ficus Replicated File System

As we approach nation-wide integration of computer systems, it is clear that le replication will play a key role, both to improve data availability in the face of failures, and to improve performancebylocatingdatanear where itwillbe used. We expect that future le systems will have an extensible, modular structure in which features such as replication can be slipped in" as a transparent layer in a stackable layered architecture. We introduce the Ficus replicated le system for NFS and show how it is layered on top of existing le systems. The Ficus le system di ers from previous le replication services in that it permits update during network partition if any copy of a le is accessible. File and directory updates are automatically propagated to accessible replicas. Con icting updates to directories are detected and automatically repaired; con icting updates to ordinary les are detected and reported to the owner. The frequency of communications outages rendering inaccessible some rep...

• Type: Conference
• Year: 1990
• Where: USENIX
• Authors: Richard G. Guy, John S. Heidemann, Wai-Kei Mak, Thomas W. Page Jr., Gerald J. Popek, Dieter Rothmeier
• Keywords: Ficus Le, Le Replication, Le Systems, Operating System, USENIX 1990