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Virtuozzo is a software service from Parallels/SwSoft that provides an alternative to hardware-based or hypervisor-based network virtualization. It is a branded name for a type of service that could be called a container-based or operating system (OS)-based virtualization service, which is becoming valuable to businesses that want to set up virtualization in certain ways.
Virtuozzo was developed by Parallels, Inc., which was acquired in 2004 by SwSoft. The two companies originally operated independently, but later merged in 2008, with SwSoft later changing its name to Parallels.
Parallels maintains a set of resources on Virtuozzo that shows how this technology works.
In a container-based or OS-based system, instead of creating individual OSs or virtual machines as a hypervisor-based virtualization, the system simply partitions the operating system into different components of a virtual network. The system works with the kernel to deliver results without setting up individual OS virtual machines.
One of the major benefits of virtual containerization over a traditional hypervisor is efficiency. Parallels says that Virtuozzo "lets you pack three times more virtual servers into each physical server than hypervisor solutions can. By minimizing the number of physical servers you need, Parallels’ Virtuozzo Containers reduces your hardware purchase, maintenance and energy costs, increasing your bottom line."
Parallels also describes its Virtuozzo system as being "optimized for cloud server virtualization" and claims that it offers "maximum density, cost efficiency and application performance" for systems.