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Server Virtualization
Server virtualization is a process that creates and abstracts multiple virtual instances on a single server. Server virtualization also masks server resources, including the number and identity of individual physical servers, processors and operating systems. Traditional computer hardware and software designs typically supported single applications. Often, this forced servers to each run a single workload, essentially wasting unused processors, memory capacity and other hardware resources.
Why is server virtualization important?
Virtualization isn't a new idea. Virtualization was an ideal and essential fit for mainframes because the substantial cost and complexity of mainframes limited them to just one deployed system -- organizations had to get the most utilization from the investment.
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First, computer hardware evolved quickly and dramatically. By the early 2000s, typical enterprise-class servers routinely provided multiple processors and far more memory and storage than most enterprise applications could realistically use. This resulted in wasted resources -- and wasted capital investment -- as excess computing capacity on each server went unused. It was common to find an enterprise server utilizing only 15% to 25% of its available resources.
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The second factor was a hard limit on facilities. Organizations simply procured and deployed additional servers as more workloads were added to the enterprise application repertoire. Over time, the sheer number of servers in operation could threaten to overwhelm a data center's physical space, cooling capacity and power availability.
Benefits of server virtualization
Server consolidation - Because virtualization enables one physical server to do the work of several servers, the total number of servers in the enterprise can be reduced. It's a process called server consolidation.
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Simplified physical infrastructure - With fewer servers, the number of racks and cables in the data center is dramatically reduced. This simplifies deployments and troubleshooting. The organization can accomplish the same computing goals with just a fraction of the space, power and cooling required for the physical server complement.
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Reduced hardware and facilities costs - Server consolidation lowers the cost of data center hardware as well as facilities -- remember, less power and cooling. Server consolidation through virtualization is a significant cost-saving tactic for organizations with large server counts.
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Greater server versatility - Because every VM exists as its own independent instance, every VM must run an independent OS. However, the OS can vary between VMs, enabling the organization to deploy any desired mix of Windows, Linux and other OSes on the same physical hardware. Such flexibility is unmatched in traditional physical server deployments.
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Improved management - Virtualization centralizes resource control and VM instance creation. Modern virtualization adds a wealth of tools and features that give IT administrators control and oversight of the virtualized environment.