Design and Implementation of a Middleware for Data Storage in Opportunistic Grids

Authors:
Raphael Y. De Camargo;Fabio Kon
Affiliations:
Universidade de São Paulo, Brazil;Universidade de Sao Paulo, Brazil
Venue:
CCGRID '07 Proceedings of the Seventh IEEE International Symposium on Cluster Computing and the Grid
Year:
2007

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Abstract

Shared machines in opportunistic grids typically have large quantities of unused disk space. These resources could be used to store application and checkpointing data when the machines are idle, allowing those machines to share not only computational cycles, but also disk space. In this paper, we present the design and implementation of OppStore, a middleware that provides reliable distributed data storage using the free disk space from shared grid ma- chines. The system utilizes a two-level peer-to-peer orga- nization to connect grid machines in a scalable and fault- tolerant way. Finally, we use the concept of virtual ids to deal with resource heterogeneity, enabling heterogeneity- aware load-balancing selection of storage sites.