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Hyper-V is a key feature of Windows Server 2008. It offers a scalable and highly available virtualization platform that is efficient and reliable. It has an inherently secure architecture with a minimal attack surface and does not contain any third-party device drivers.
Hyper-V has three main components: the hypervisor, the virtualization stack, and the new virtualized I/O model. The hypervisor, also know as the virtual machine monitor, is a very small layer of software that is present directly on the processor, which creates the different “partitions” within which each virtualized instance of the operating system will run.
The Hyper-V role requires a clean install of Windows Server 2008 Enterprise on the host machine. Hyper-V requires 64-bit hardware and a 64-bit version of the operating system. You must also ensure that you have hardware-assisted virtualization enabled prior to installation.
Virtual machines are created in the Hyper-V role of Windows Server 2008 via the Hyper-V manager. They can be configured for via the Virtual Machine Connection or through the Hyper-V manager.
Virtual hard disks can be created and managed via the Hyper-V manager or via the New Virtual Hard Disk Wizard. VHDs can be edited using the Edit Virtual Hard Disk wizard. Hyper-V allows for 256 virtual hard discs per Virtual SCSI controller. This means that you can add up to a Petabyte of storage per virtual machine created.
Server consolidation is the process of migrating network services and applications from multiple computers to a singular computer. This consolidation can include multiple physical computers to multiple virtual computers on one host computer. You can consolidate computers for several reasons, such as minimizing power consumption, simplifying administration duties, or reducing overall cost. Consolidation can also increase hardware resource utilization.
The planned guest partition (virtual machine) used for migration should include an advanced system with a uniprocessor or multiprocessor configuration, a virtualized network card, and a virtualized hard disk. Hardware that is not supported includes parallel port dongles, almost all universal serial bus devices, and hardware-based authentication. The physical computer you are using for the migration must also contain more than 96 MB RAM. It should also run the NTFS file system.
Virtualization technology often is deployed in an attempt to make outages, planned or unplanned, invisible to users. Hyper-V can help in the areas of access virtualization, application virtualization, processing virtualization, network virtualization, storage virtualization, and tools to manage its virtualized environment.