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The capability of dynamically monitoring the performance of the communication infrastructure is one of the emerging requirements for a Grid. The paper claims that such a capability is in fact orthogonal to the more popular collection of data for scheduling and diagnosis, which needs large storage and indexing capabilities, but may disregard real-time performance issues. The paper discusses such claim analysing the gLite NPM architecture, and it describes a novel network monitoring infrastructure specifically designed for demand driven monitoring, named gd2, that can be potentially integrated in the gLite framework. The paper describes an implementation of gd2 architecture on a virtual testbed.
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