What Is Server Virtualization & Why Is It Important?

Unless you’re operating with a limitless budget (which you aren’t), you should strive to utilize available resources as efficiently as possible. Server virtualization can help ensure that your servers are always running at peak capacity, instead of idling and wastefully consuming electricity that could be utilized much better. 

This article is the perfect starting point if you’re new to server virtualization and its benefits. You’ll know how to leverage server virtualization to optimize your hardware and boost efficiency by the end.

What Is Server Virtualization?

Server virtualization refers to the partitioning of a single server using virtualization software to create multiple virtual servers, each capable of running its own operating system and applications independently of other virtual servers. 

To better illustrate how server virtualization works in practice, imagine you run a company that consists of the following departments: Marketing, Finance, Operations Management, Human Resource, and IT. 

You want each of these departments to have its own office space. Assuming you have the money to do so, you could move the individual departments into their own office buildings, but that would be inefficient and overly expensive.

What’s far more efficient is to rent a single large office building and divide it so that each department has just enough office space to comfortably do its job. That’s basically what server virtualization allows you to do with your server resources. 

Can Server Virtualization Improve Security?

Yes, server virtualization can certainly improve security, such as by making the IT infrastructure easier to manage. That said, virtual machines are not inherently bullet-proof, and they still need to be actively maintained and protected to resist cybersecurity threats. 

Types of Server Virtualization

There are three main types of server virtualization you should know.

1. Full Virtualization

This type of server virtualization relies on special software application called a hypervisor. It acts as a messenger between the physical server and the software running on it. Full virtualization allows multiple independent servers to run different operating systems side-by-side without being aware of each other’s presence.

What is a Hypervisor?

A hypervisor is a piece of software that allows a virtual machine to communicate with the physical hardware on which it runs. There are two types of hypervisors: type 1 and type 2.

What is a Virtual Machine (VM)?

You can think of a virtual machine as a virtual representation of a real desktop computer or server. Its defining characteristic is the fact that it doesn’t communicate directly with the physical hardware on which it runs. 

What’s the Difference Between Type 1 and Type 2 Hypervisors?

Type 1 hypervisors run directly on the server hardware, assuming the place of a regular operating system like Windows or Linux. On the other hand, type 2 hypervisors are installed on top of a conventional operating system.

2. Para-virtualization

This virtualization technique is different from full virtualization in that the virtualized operating system (the so-called guest OS) is aware that it’s being virtualized and can perform certain tasks in cooperating with the host operating system. The advantage of this approach is improved performance.

What’s the Difference Between Full Virtualization and Para-Virtualization?

Para-virtualization differs from full virtualization in that the virtualized operating system (the so-called guest OS) is aware that it’s being virtualized.

3. OS-level virtualization

When the goal is to create virtual machines that all run the same operating system, then the virtualization capability can be provided directly by the operating system instead of a hypervisor. While achieving strong isolation among virtual machines can be a challenge, the low overhead associated with this approach means better utilization of hardware resources. 

Benefits of Server Virtualization

The benefits of server virtualization include greater utilization of resources, lower costs, faster provisioning, improved disaster recovery, reduction of IT complexity, easier management, and higher security. 

Let’s look at each in detail.

1. Greater Utilization of Resources

Maintaining multiple underutilized servers to run different operating systems or separate applications is inefficient. Server virtualization allows you to run multiple operating systems and applications on a single server, optimizing resources and reducing waste.

2. Lower Costs

The fewer servers you need, the lower your maintenance costs will be. Moreover, it’s typically less expensive to purchase a single high-performance server than multiple low-end servers. A single server utilized to its maximum capacity will likely consume less energy than multiple idling servers combined, and it will also be much easier to cool.

3. Faster Provisioning 

It takes a lot of work to set up a new server from scratch and make it ready for use in an existing network. A virtual machine, on the other hand, can be created with just a few clicks and instantly used to support new workloads. Best of all, getting rid of an unnecessary virtual machine is as easy as deleting a file, so you can experiment without the risk of losing money. 

4. Improved Disaster Recovery

A virtual machine can be easily compressed into a single file, making it easy to back up. Because virtual machines are typically self-contained environments, they can be restored to any physical server hardware following a disaster. The only thing that must be configured for backed-up virtual machines to work on new hardware is the hypervisor itself. 

5. Reduction of IT Complexity 

Modern virtualization software is the closest thing administrators have to the idea of a single pane of glass management—at least when it comes to the management of server hardware. Virtualized servers can be monitored from a central location and adjusted with minimal friction. 

6. Easier Management 

7. Higher Security 

There are countless organizations that have been breached because of some unpatched or misconfigured dusty server that has been repurposed several times during its life. Server virtualization can prevent such breaches by creating a tighter, more optimized IT environment. 

How to Virtualize a Server 

The benefits of server virtualization are easy to understand, so making a business case for its implementation isn’t difficult. But how do you actually virtualize a server? With the help of a hypervisor.

Earlier in this article, we stated that a hypervisor acts as a messenger between the physical server and the software running on it. In fact, you can think of this messenger as a food delivery driver. Thanks to its hard work, a single restaurant (server) can serve food to multiple customers (virtual machines), even if the customers never physically visit the restaurant or sit at a table.

A hypervisor knows which physical server resources, such as gigabytes of storage space and memory, CPU cores, and so on, are allocated to which virtual machines. Hypervisors are divided into two main categories: 

Type 1 - Bare Metal

As the name suggests, this hypervisor runs directly on the server hardware, assuming the place of a regular operating system like Windows or Linux. Their proximity to physical hardware makes type 1 hypervisors perform well, and the removal of traditional operating systems from the equation makes them more secure. Popular type 1 hypervisors include Microsoft Hyper-V, VMware ESXi, and Citrix XenServer.

Type 2 - Hosted

Hypervisors that belong in this category are installed on a conventional operating system like Windows or Linux, and they rely on it for critical functionality. The presence of the extra layer between the physical server hardware and the virtual machine is directly responsible for the lower performance of type 2 hypervisors. On the other hand, hypervisors that belong in this category, such as VMware Workstation and Oracle VirtualBox, are sometimes perceived as more user-friendly since they can be installed just like regular desktop applications.

Hypervisor Implementation

For true server virtualization, type 1 hypervisors are an easy choice because the advantage of type 2 hypervisors is irrelevant in the data center. 

Implementation of a hypervisor to virtualize physical hardware resources requires advanced skills and a fair amount of experience. So. organizations whose bread and butter isn’t information technology and networking in particular shouldn’t attempt it on their own. 

Instead, they should partner with a managed service provider, like Teal. We can make server virtualization completely painless. That way your entire organization can reap its benefits without having to jump through hoops that don’t fit you. 