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Under the emerging paradigm of Federated Computing Services (FCS), one can create multiple Virtual Infrastructures (VI), one for each distributed computing application or service offering. Each VI may consist of a number of geographically distributed computing clusters that are connected with a set of dedicated circuits. In general, a VI submitted by a user to the FCS provider is unmapped at the time of the submission in that the user does not specify which computing clusters to use. The primary challenge to the FCS provider in supporting these novel applications is to establish a VI optimally over the substrate network such as a WDM network connecting many computing clusters.
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