KVM VPS vs OpenVZ VPS: Understanding the Real Difference

Many people select VPS hosting server plans based only on price, but the underlying virtualization layer can change the whole experience. The virtualization technologies like KVM and OpenVZ, for instance, handle system resources in very different ways, which directly affects performance and what operating systems you can run. That becomes even more important when choosing a cheap Windows VPS server India setup for business or development workloads.

What is Virtualization?

To cut a long story short, virtualization technology makes it possible to divide one physical server into multiple virtual environments that run simultaneously. Want to know how? With the help of software referred to as the ‘hypervisor’ that divides a physical server into separate virtual machines.

It can be inferred, as each virtual environment works within its own boundaries, so activity on one server cannot affect the performance or configuration of another. Furthermore, this hypervisor layer also helps by separating VMs from the main host system to improve stability and control and also distributes system resources such as RAM, CPU, and storage space across different virtual machines.

What is Containerization?

Containerization works on a completely different principle than virtualization. In this setting, a hypervisor is not used at all. The server runs a host operating system (OS), and containers are developed on it.

With the help of these containers, companies usually run individual applications along with the operating system that also manages how resources are shared among them. In this architecture, the containers do not have their own kernel or drivers; instead, they use shared drivers across all containers. This method is closely dependent upon the operating system, so it can run only those applications that are compatible with that system.

Now, we'll take a closer look at KVM and OpenVZ separately.

KVM

KVM is an abbreviation for Kernel-based Virtual Machine, an open-source tool that enables virtualization on Linux systems. It makes use of a type 2 hypervisor. A type 2 hypervisor is mainly a software that is installed on top of an existing operating system to manage virtual machines.

KVM runs inside the Linux kernel. And a Linux kernel is the core part of the operating system which is responsible for handling essential system functions. In a KVM virtualization setup, the Linux kernel itself functions as the hypervisor, because of which the virtual machine operations become easy, and it also enhances the performance.

KVM has been a part of a Linux operating system since 2007 and can be installed directly with it. It supports running multiple guest operating systems such as Windows, Haiku, Solaris, and several others.

OpenVZ

OpenVZ is a Linux-based virtualization technology that works at the operating system level. This virtualization technology was originally built by Virtuzzo in 2000 and later released as open source in 2005 under the name Open Virtuozzo. Virtuzzo is a private software company. In this method, a single physical server hosts multiple independent Linux containers that are often referred to as VPSs or virtual environments. Each container functions like an individual server on its own.

KVM VPS vs OpenVZ VPS

When companies decide to buy a cheap Windows VPS server India, they usually compare and contrast these two options that hosts offer. That means examining the differences between them. That's what we'll do with OpenVZ and KVM.

First off, the biggest difference between KVM and OpenVZ is that OpenVZ only hosts Linux operating systems. KVM is a lot more flexible in this regard. As we have seen before, there are many guest operating systems that can run with KVM (by using virtualization extensions to connect to them).

Second, OpenVZ allows you to share resources such as RAM entirely. This is how it goes. OpenVZ uses a shared kernel with a thin layer of virtualization on the operating system (Linux). The kernel is shared by all cheapest Linux VPS users on that node and so is fixed, i.e., it cannot be customised by users. Once companies have used their allotment of RAM, the rest of the server users can use that RAM. This is fine for small applications; however, companies that are running resource-heavy applications may run into some problems.

Users of KVM, however, can assign values to their resources. Then the applications only use the resources they need. That means companies can run at high capacity with less demand from the hypervisor. Every individual has 100% dedicated RAM, CPU, and storage. So KVM offers its users a separate environment, and users are assigned their own kernel.

Overselling Challenges

A common problem these days that many companies encounter is overselling. This is particularly true for OpenVZ systems; companies can find themselves on a system with too many containers. This means that OpenVZ might be available at a cheaper price, but there is always a risk of overselling to be kept in mind.

Conclusion

OpenVZ can be an option for companies looking for scalability and speed. KVM delivers virtualized hardware and guaranteed resources. KVM is ideal for game servers, resellers and small to medium-sized businesses. KVM also allows you to have another OS and a more advanced Linux kernel. It depends on what the company needs to meet their specific requirements. Choose wisely and it will serve you well.