Add to ORKGAlso available as an INRIA Research Report 4924: http://www.inria.fr/rrrt/rr-4924.htmlIn this paper, we show that, although P2P systems and DSM systems have been designed in rather different contexts, both can serve as major sources of inspiration for the design of a hybrid system, with intermediate hypotheses and properties. We propose the concept of data sharing service for grid computing, as a compromise between DSM systems and P2P systems. The main contribution of such a service is to decouple data management from grid computation, by providing location transparency as well as data persistence in a dynamic environment. To illustrate the proposed concept and validate its feasibility, we have implemented a software prototype: the JuxMem p...