Windows Server 2012 with Hyper-V
Virtualization is a major part of today’s data centers. The operating efficiencies offered by virtualization allow organizations to dramatically reduce operational effort and power consumption.
Hyper-V virtualizes the system resources of a physical computer. Computer virtualization allows you to provide a virtualized environment for operating systems and applications.
VMware vSphere Hypervisor is based on VMware ESXi, the hypervisor architecture that sets the industry standard for reliability, performance and ecosystem support.
VMware vSphere is the easiest way to get started with virtualization—and it’s free. Consolidate your applications onto fewer servers and start saving money through reduced hardware and administration costs.
Citrix® XenServer® is a complete, managed server virtualization platform built on the powerful Xen® hypervisor.
Citrix® XenServer® is the enterprise-ready, cloud-proven virtualization platform that contains all the capabilities required to create and manage a Windows® and/or Linux® virtual virtual infrastructure.
Kernel-based Virtual Machine
Using KVM (for Kernel-based Virtual Machine), one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, disk, graphics adapter, etc.
KVM is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V).