Daniel J. Warmenhoven, Network Appliance

Daniel J. Warmenhoven, the chief executive of eight-year-old Network Appliance Inc. (NTAP), may be reprising the role of John Chambers. A decade ago Chambers' Cisco Systems Corp. (CSCO) began beating up on IBM (IBM) with faster, cheaper ways to tie computers together. Now, Warmenhoven is poised for a similar run against mighty rival EMC Corp. (EMC) A veteran of IBM himself and also Hewlett-Packard Co. (HWP), Warmenhoven, 50, is brilliantly executing a strategy to exploit a more cost-

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