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Web servers in Small and Medium Enterprises (SME) consume a significant amount of energy. The authors consider how a hybrid SME web server based on two co-located platforms (one high performance and high power and the second low performance and low power) can be architected to appear as a single system image to clients. A prototype based on a Dell AMD Athlon x64-based PC and a Sheeva ARM-based plug computer is described and evaluated using the Apache ab benchmark. Using traffic traces from the KETI corporate web server, they show that for the majority of the time a low-performance platform can very likely meet the performance demands (during which time the high-power platform can sleep).
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