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RAM Grid is a novel grid system to share the distributed memory resources across the wide area network, and provides disk cache for other nodes which are short of memory. The resource information management system, which monitors and manages the resources in grid environment, takes a key role for RAM Grid. Under the special requirements of RAM Grid, we propose a grid resources management system GridEye, the architecture and mechanism are also discussed. In order to improve the performance, a new caching strategy optimized for RAM Grid is proposed. We have verified the effectiveness of the proposed method through analysis and experiments on the implemented prototype system.