Virtualization can drive up resource utilization on individual servers, thus increasing the total return on those investments. Moreover, it can integrate distributed systems, transforming disparate racks of compute and storage servers into a bona fide enterprise IT platform. Two new major developments will have a dramatic effect on virtualization technology adoption. On the hardware side, x86 architecture-based microprocessor manufacturers have released a new generation of chips that support virtualization natively. On the software side, the emergence of the open-source Xen hypervisor virtual machine technology has eliminated much of the performance impact associated with the mediation layer that accompanies full virtualization and software emulation. The introduction of Xen also drives down the overall cost of virtualization.
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