Quoting from Linux.com

Virtualization is sweeping the nation. Well, maybe not the nation, but it's a big hit with data centers and organizations that need to consolidate systems and streamline management. With so many virtualization applications on the market, which one to choose? SWsoft's Virtuozzo is strong contender. I reviewed Virtuozzo 3.0 for Linux, and it's definitely one of the best options you can choose to centralize server management and consolidate workloads onto fewer systems.

Unlike some virtualization solutions, Virtuozzo doesn't present a software virtual machine to an operating system to run multiple OSes on the same system. Instead, Virtuozzo uses OS-level virtualization to partition the system into separate Virtual Private Servers (VPS) -- similar to Solaris Zones or Linux-VServer.

This means that Virtuozzo for Linux can run several Linux VPSes, but unlike VMware, it doesn't run multiple OSes on the same server. That might seem to limit your choices somewhat, but many organizations have no interest in running different OSes in virtual containers -- they just need a way to improve hardware utilization through server consolidation, and make system management easier. Virtuozzo does do that very well.

Each Virtuozzo VPS has its own filesystem, root user, and configurations. For all intents and purposes, each VPS is its own separate system.

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The article goes on to describe Installation, Setup and Management, Disaster Recovery, QoS Rules, and Documentation.

Summary

Any business or organization that's looking at virtualization should put Virtuozzo at the top of the list. It's a really powerful solution that's relatively simple to administer and use.

Virtuozzo is not the same type of solution as VMware Server or ESX. Since Virtuozzo approaches virtualization differently, you don't have the same operating system flexibility that you'd have with VMware Server -- want to run FreeBSD, Linux, and Windows on the same machines? Then Virtuozzo isn't the offering for your organization. Want to use a virtualization solution that helps partition servers into multiple Linux VPSes, and makes things much easier to manage? Then I'd recommend checking out Virtuozzo when you evaluate solutions.

If you're an "open source at all costs" type of person, take a look at SWsoft's OpenVZ instead. OpenVZ has a subset of the features included with Virtuozzo -- you can still run multiple guests on a single host, and it offers much of the same functionality in terms of QoS features, but it lacks the GUI tools and utilities that make it really easy to manage Virtuozzo.

Read and comment on the original article, here.