Availability and consistency tradeoffs in the Echo distributed filesystem
Hisgen, A.; Birrell, A.; Mann, T.; Schroeder, M.; Swart, G.
Workstation Operating Systems, 1989., Proceedings of the Second Workshop on
Volume , Issue , 27-29 Sep 1989 Page(s):49 - 54
Digital Object Identifier 10.1109/WWOS.1989.109267
Summary:The use of server replication to increase the availability of
remote servers in a system of workstations is discussed. Tradeoffs
between consistency of replication and caching versus availability are
considered for the Echo distributed file system which uses two different
replication techniques, one at the upper levels of the hierarchical name
space, the name service, and another at the lower levels of the name
space, the file volume service. The two replication techniques provide
different guarantees of consistency between their replicas and,
therefore, different levels of availability. Echo also caches data from
the name service and file volume service in client machines (e.g.
workstations), with the cache for each service having its own cache
consistency guarantee that mimics the guarantee on the consistency of
the replicas for that service. The replication and caching consistency
guarantees provided by each service are appropriate for its intended use
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