Virtualization is More than Virtual Machine Software

Short Description
It is clear to those who have explored the topic of virtualization technology that it encompasses far more than just virtual machine software, such as VMware ESX Server, XenSource XenEnterprise or Microsoft Virtual Server. Over the last 30 years, virtualization technology has been developed to enhance how individuals access computing solutions, how applications are developed and deployed, how they are processed, where and how they are stored, how systems communicate with one another, and, of course, how an extended system environment can be made both secure and manageable. This broad view is very important if an organization hopes to make optimal use of this technology.

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Content
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ACCESS VIRTUALIZATION
Access virtualization includes hardware and software technology that allows nearly any device to access any application without either having to know too much about the other. The application sees a device it’s used to working with. The device sees an application it knows how to display. In some cases, special purpose hardware is used on each side of the network connection to increase performance, allow many users to share a single client system or allow a single individual to see multiple displays. Functions such as terminal services and presentation managers would be found in this layer.
APPLICATION VIRTUALIZATION
Application virtualization includes software technology allowing applications to run on many different operating systems and hardware platforms. This usually means that the application has been written to use an application framework. It also means that applications running on the same system that do not use this framework would not experience the benefits of application virtualization. This layer of technology makes it possible to restart an application in case of a failure, start another instance of an application if the application is not meeting service level objectives, or provide workload balancing among multiple instances of an application to achieve high levels of scalability.
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