The major aim of a Grid is to federate several powerful distributed resources within a single virtual entity which can be accessed transparently and efficiently by external users. As a Grid is a distributed and unreliable system involving heterogeneous resources located in different geographical domains, fault-tolerant resource allocation services have to be provided. In particular, when crashes occur, tasks have to be reallocated quickly and automatically, in a completely transparent way from the users point of view. This paper presents Paradis, a system based on a Consensus building block that has been designed and implemented in a Grid dedicated to genomic applications. These time-consuming applications can be split up into a huge number of independent tasks which can be allocated independently on different domains.
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