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OpenVZ
OpenVZ (Open Virtuozzo) is an operating system-level virtualization technology for Linux. It allows a physical server to run multiple isolated operating system instances, called containers, virtual private servers (VPSs), or virtual environments (VEs.) OpenVZ is similar to Solaris Containers and LXC.
==OpenVZ compared to other virtualization technologies==
While virtualization technologies like VMware and Xen provide full virtualization and can run multiple operating systems and different kernel versions, OpenVZ uses a single patched Linux kernel and therefore can run only Linux. All OpenVZ containers share the same architecture and kernel version. This can be a disadvantage in situations where guests require different kernel versions than that of the host. However, as it does not have the overhead of a true hypervisor, it is very fast and efficient.〔http://www.hpl.hp.com/techreports/2007/HPL-2007-59R1.html?jumpid=reg_R1002_USEN〕
Memory allocation with OpenVZ is soft in that memory not used in one virtual environment can be used by others or for disk caching. While old versions of OpenVZ used a common file system (where each virtual environment is just a directory of files that is isolated using chroot), current versions of OpenVZ allow each container to have its own file system.〔http://wiki.openvz.org/Ploop〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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