D.L. McCue
M.C. Little
University of Newcastle upon Tyne. 1992
We have been investigating the design of a replica management system (RMS) which allows a programmer to specify the quality of service required for individual replicated objects in terms of availability and performance. From the quality of service specification, information about the replication protocol to be used, and data about the characteristics of the underlying distributed system, the RMS computes an initial placement and replication level for the replicated object. As machines and communications systems are detected to have failed or recovered, the RMS can be re-invoked to compute an updated mapping of replicas which preserves the desired quality of service.