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With the emergence of data-intensive applications, recent years have seen a fast-growing volume of I/O traffic propagated through the local I/O interconnect bus. This raises up a question for storage servers on how to resolve such a potential bottleneck. In this paper, the authors present a hierarchical Data Cache Architecture called DCA to effectively slash local interconnect traffic and thus boost the storage server performance. A popular iSCSI storage server architecture is chosen as an example. DCA is composed of a read cache in NIC called NIC cache and a read/write unified cache in host memory called Helper cache.
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