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A memory approach to consistent, reliable distributed shared memory

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2 Author(s)
Juul, N.C. ; Copenhagen Bus. Sch., Denmark ; Fleisch, B.D.

Fault-tolerant distributed shared memory systems do not always need to support a complete and consistent recovery after a failure. We describe a framework, within which different approaches to, and different degrees of consistency and recoverability can be understood. The addition of consistent failure recovery may be approached from two different viewpoints: either by an application-oriented view or a memory-oriented view. The major characteristics used in our framework are variations of availability, consistency, and application support. The paper explains the basic model, which is used in RELIABLE MIRAGE+, and describes how the framework can be used by other researchers to understand and classify solutions to the reliable DSM problem. The model distinguishes a recoverable system, which must be able to survive any single-site failure, from a reliable system which also ensures consistency after the recovery. Since consistency requirements may impose a high penalty on standard operational performance, various relaxed recoverability consistencies are described by the multi-level model. Recovery under this model may be accomplished by applications specifying consistency and availability requirements

Published in:

Hot Topics in Operating Systems, 1995. (HotOS-V), Proceedings., Fifth Workshop on

Date of Conference:

4-5 May 1995