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As virtualization and cloud computing become more entrenched in data centers, these technologies are having major impact on IT professionals’ choice of system hardware and architectures. In recent years, data centers have followed the scale-up model, consolidating resources by relying on small numbers of large, powerful machines. Today, data center architecture frequently relies on larger numbers of commodity server equipment, in a scale-out strategy. This shift has changed the way companies operate, and IT professionals need to understand the issues involved with both architectural approaches.