Parallels Virtuozzo


Virtuozzo is a proprietary operating system-level virtualization product produced by Parallels, Inc. Both windows and Linux. Parallels Virtuozzo Containers creates multiple, isolated containers (otherwise known as virtual environments (VEs), or Virtual Private Servers (VPS's) on a single physical server. Parallels Virtuozzo Containers virtualizes at the operating system level, rather than the hardware level as other Virtual Machine (VM) products frequently do. This allows the sharing of hardware, systems management effort, and sometimes software licenses among different workloads. A container behaves in most respects as if it were a stand-alone server.

Parallels Virtuozzo Containers was designed to be a low-overhead, fast-performing solution with many tools for simple management, since its early adopters include service providers with thousands of containers to manage. The technology is based on a single OS flavor for a server, which means that a Windows server can only host Windows containers and that a Linux servers can only host Linux containers.
 

Microsoft Hyper-V

Hyper-V provides a reliable virtualization platform that enables customers to virtualize their infrastructure and reduce costs. It has thin microkernelized hypervisor architecture with minimal attack surface and is available as a Server Core role. With integrated management customers can use a single set of tools to manage both their physical and virtual resources. It easily plugs into customers' IT infrastructure as they can leverage their existing patching, provisioning, management and support tools and processes. It provides great value as it is available as a feature of Windows Server 2008 and customers can leverage the breadth of solutions from Microsoft's partners, existing IT Pro skill-set and comprehensive support from Microsoft. Enjoy the enterprise-class reliability with blazing fast server peformance, harness the power of the Windows 2008 Server OS with Hyper-V, now available in a hosted Hyper-V Dedicated Server Series

Citrix Xen Server

Citrix Xen is a software virtual machine for IA-32, x86-64, IA-64 and PowerPC 970 architectures. On most CPUs, Xen uses a form of virtualization known as paravirtualization, meaning that the guest operating system must be modified to use a special hypercall ABI instead of certain architectural features. Intel has contributed modifications to Xen to support their VT-x (formerly Vanderpool) architecture extensions. Similarly AMD has contributed support for their AMD-V extensions. These technologies, while differing quite substantially in their implementation and instruction sets, are managed by a common abstraction layer in Xen and enable unmodified guest operating systems to run within Xen virtual machines, starting with Xen 3.0. Operating systems supported as guest includes, almost all distributions of Linux, Microsoft Windows, Free BSD, Open BSD, Open Solaris and Netware.