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The Computing Models of the LHC experiments continue to evolve from the simple hierarchical MONARC model towards more agile models where data is exchanged among many Tier2 and Tier3 sites, relying on both large scale file transfers with strategic data placement, and an increased use of remote access to object collections with caching through CMS's AAA, ATLAS' FAX and ALICE's AliEn projects, for example. The challenges presented by expanding needs for CPU, storage and network capacity as welldoi:10.1088/1742-6596/664/5/052033 fatcat:f3gbgrjhybb43ouhpzec2xn6jy