The utilization rate of non virtualized windows and

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Unformatted text preview: mply by cutting the number of servers required to run a given set of production applications, server virtualization can cut IT operating costs dramatically. The utilization rate of non-virtualized Windows and Linux servers is typically in single-digit percentages, and can be comfortably raised to 50% or more after virtualization. This alone has been enough to justify the first wave of server virtualization. But the technology also improves application performance and availability, and lowers the cost of disaster recovery systems. These benefits are arguably even greater than those delivered by consolidation, because they allow IT departments to improve service levels as well as to reduce costs. This frees up resources for the development of new applications, and virtualization has a multiplier effect in that it also speeds up application development. Virtual resources can be provisioned to development projects far faster than physical resources, and with much less labor and capital cost. When development and testing have been completed, applications can also be moved into production more quickly. Similarly, pilot programs or proofs of concept can be completed more quickly and cheaply in the virtual world than in the physical world. Do not underestimate the challenges These virtues cut the other way, and can be vices. The flexibility that virtualization introduces can exacerbate existing problems or weaknesses in IT management. Exactly as for physical servers, IT departments need to maintain security, minimize costs, and maximize service levels by knowing what virtual servers are running, where they are running, how they are configured, and what resources they are consuming. In virtualized environments, these duties are hugely complicated by the ability to create virtual servers with ease, and move them from host to host at will. Furthermore, existing server management tools built to work only with physical servers can deliver only a blinkered view of virtual environments. In addition, IT teams need reorganizing, because vir...
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This document was uploaded on 12/31/2013.

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