Virtual clusters spanning over resources belonging to different administration domains have to face with the computational resources brokering problem in order to allow the direct interaction among them. Typically, it requires some component collecting, elaborating and providing resources information. Currently, every virtual cluster project provides its own solution with a low degree of portability and isolation from the rest of the platform components. We propose the Information Brokering Service Provider (IBSP), a general approach which wants to represent an uniform solution adaptable to a wide set of existing platforms. Its pluggable and flexible design is based on a decentralized architecture where each of the cooperating nodes is composed by a resource interface exposing the brokering service, and a portion of a distributed information system. In this paper, we present the motivations, principles and implementation of IBSP as well as the performance of IBSP serving the Private Virtual Cluster system.
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