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Data grids provide groundwork for huge, data-intensive applications that produce enormous data. Data replication increases the availability and reliability of data by providing identical copies of the replicated files distributed at grid sites across the world. Typically these data grid sites vary in their capabilities and their abilities to provide different levels of QoS. Replica selection in data grids remains a significant challenge and requires more attention because the current algorithms do not offer balanced QoS levels and the mechanism of rating QoS parameters.
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