Virtual machine technology applies to both server and client hardware. Virtual machine technology enables multiple operating systems to run concurrently on a single machine. In particular, Hyper-V, a key feature of Windows Server 2008, enables one or more operating systems to run simultaneously on the same physical system. Today, many x86-based operating systems are supported by Virtual PC 2007, Virtual Server 2005, and Hyper-V.
What is virtual machine technology used for?
Virtual machine technology serves a variety of purposes. It enables hardware consolidation, because multiple operating systems can run on one computer. Key applications for virtual machine technology include cross-platform integration as well as the following:
Server consolidation. If several servers run applications that consume only a fraction of the available resources, virtual machine technology can be used to enable them to run side by side on a single server, even if they require different versions of the operating system or middleware.
Consolidation for development and testing environments. Each virtual machine acts as a separate environment, which reduces risk and enables developers to quickly recreate different operating system configurations or compare versions of applications designed for different operating systems. In addition, a developer can test early development versions of an application in a virtual machine without fear of destabilizing the system for other users.
Legacy application re-hosting. Legacy operating systems and applications can run on new hardware along with more recent operating systems and applications.
Simplify disaster and recovery. Virtual machine technology can be used as part of a disaster and recovery plan that requires application portability and flexibility across hardware platforms.
Moving to a dynamic datacenter. Hyper-V, along with systems management solutions, helps you to now create a dynamic IT environment that not only enables you to react to problems more efficiently but also to create a proactive and self-managing IT management solution.
Virtual machine technology serves a variety of purposes. It enables hardware consolidation, because multiple operating systems can run on one computer. Key applications for virtual machine technology include cross-platform integration as well as the following:
Server consolidation. If several servers run applications that consume only a fraction of the available resources, virtual machine technology can be used to enable them to run side by side on a single server, even if they require different versions of the operating system or middleware.
Consolidation for development and testing environments. Each virtual machine acts as a separate environment, which reduces risk and enables developers to quickly recreate different operating system configurations or compare versions of applications designed for different operating systems. In addition, a developer can test early development versions of an application in a virtual machine without fear of destabilizing the system for other users.
Legacy application re-hosting. Legacy operating systems and applications can run on new hardware along with more recent operating systems and applications.
Simplify disaster and recovery. Virtual machine technology can be used as part of a disaster and recovery plan that requires application portability and flexibility across hardware platforms.
Moving to a dynamic datacenter. Hyper-V, along with systems management solutions, helps you to now create a dynamic IT environment that not only enables you to react to problems more efficiently but also to create a proactive and self-managing IT management solution.
Virtual PC lets you create separate virtual machines on your Windows desktop, each of which virtualizes the hardware of a complete physical computer. Use virtual machines to run operating systems such as MS-DOS, Windows, and OS/2. You can run multiple operating systems at once on a single physical computer and switch between them as easily as switching applications—instantly, with a mouse click. Virtual PC is perfect for any scenario in which you need to support multiple operating systems, whether you use it for tech support, legacy application support, training, or just for consolidating physical computers.
Virtual PC provides a time-saving and cost-saving solution anywhere users must run multiple operating systems. Use Virtual PC in the following scenarios:
Ease Migration: Run legacy applications in a virtual machine instead of delaying the deployment of a new operating system just because of application incompatibility. Test your migration plans using virtual machines instead of actual physical computers.
Do More in Less Time: Support staff can run multiple operating systems on a single physical computer and switch between them easily. They can also restore virtual machines to their previous state almost instantly. Train students on multiple operating systems and virtual networks instead of purchasing and supporting additional computers.
Streamline Deployment: Test software on different operating systems more easily. One crashing application or operating system doesn’t affect others.
Accelerate Development: Increase quality assurance by testing and documenting your software on multiple operating systems using virtual machines. Decrease time-to-market by reducing reconfiguration time.
Ease Migration: Run legacy applications in a virtual machine instead of delaying the deployment of a new operating system just because of application incompatibility. Test your migration plans using virtual machines instead of actual physical computers.
Do More in Less Time: Support staff can run multiple operating systems on a single physical computer and switch between them easily. They can also restore virtual machines to their previous state almost instantly. Train students on multiple operating systems and virtual networks instead of purchasing and supporting additional computers.
Streamline Deployment: Test software on different operating systems more easily. One crashing application or operating system doesn’t affect others.
Accelerate Development: Increase quality assurance by testing and documenting your software on multiple operating systems using virtual machines. Decrease time-to-market by reducing reconfiguration time.
Configurability
After installing Virtual PC, you can configure it to suit your requirements. Virtual PC has a number of settings that control how the product interacts with the physical computer, allocates resources, and so on.
Easy installation
Virtual PC is simple to install. Any administrator can run the Virtual PC guided setup program, and installation doesn’t require a reboot. The first time Virtual PC starts, it guides you through the process of creating the first virtual machine.
Standardization
Configure and test upgrades and installations on virtual machines, and then you can deploy throughout your company a standard configuration that avoids problems caused by minor differences between hardware platforms.
Convenience
Users switch between operating systems as easily as they switch between applications. They simply click the window containing the virtual machine. They can pause individual virtual machines so they stop using CPU cycles on the physical computer. They can also save virtual machines to disk and restore them at a later time. The restoration process normally takes a few seconds—much faster than restarting the guest operating system.
Host integration
Users can copy, paste, drag, and drop between guest and host. Virtual PC provides additions that you install in a guest operating system to enable this functionality.
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In virtualization technology, hypervisor is a software program that manages multiple OS (or multiple instances of the same OS) on a single computer system. The hypervisor manages the system's processor, memory, and other resources to allocate what each operating system requires. Hypervisors are designed for a particular processor architecture and may also be called virtualization managers.
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