Today I want to talk about virtualization in a more theoretical sense in order that you understand what type of virtualization to choose depending upon your needs.
Over the years, virtualization has evolved and adapted to the needs of users and/or the market. This evolution has resulted in different types of virtualization that go well beyond “classic” tools such as VMware or VirtualBox, giving us a wide range of possibilities to choose from. Among these types, there are two of them that have proven to be the most efficient of all and the most “innovative” in the field of virtualization. These types of virtualization are called level virtualization operating system and virtualization Kernel level, although they are best known for tools that make use of such technologies: OpenVZ and KVM (respectively).
Both virtualizations are very useful, but they have a number of differences that, although at first glance they cannot seem very significant, in practice they can be decisive in opting for one choice or another. To understand the difference between the two, the best would be to understand what each type of virtualization offers us.
But what are the differences in between KVM and OpenVZ Virtualization? Let’s take a look!
First of all, the foremost basic difference between OpenVZ and KVM is that OpenVZ can solely host Linux operating systems, whereas KVM is a lot versatile and might host Linux, Windows, or can opt for custom OS.
Advantages and disadvantages of OpenVZ are that it permits the complete sharing of resources. OpenVZ uses a shared kernel with a layer of virtualization on top of the particular Linux Operating System. Since this kernel is shared by all the users over a specific node on VPS, the kernel isn’t customizable. Once you’ve hit your allotted RAM provided to you by the host, the remaining RAM becomes free for other server users. This is often not a problem if you run small software or applications, however, you may find yourself in a trouble if you’re running something that is resource-intensive.
With KVM, you can setup maximum and minimum values on your resources, allowing you to use only the resources that your applications will require. This is often true, real hardware virtualization, which means higher performance from lower needs on the hypervisor. 100 percent of the RAM and disk resources are dedicated to at least one individual user. KVM comes with an isolated environment and provides users their own kernel.
Know the risk of overselling: Overselling is something where a web hosting provider overcommits the server resources to specific users considering that not each of the account uses up all those resources at a time. Whereas everything is oversold, Stay away from shady hosting firms that often oversells OpenVZ systems and host you on a system that has several containers. KVM also can be oversold, but it is highly isolated. Since OpenVZ hosts are usually oversold, OpenVZ servers are usually cheaper than KVM servers.
If you are looking for Speed, Scalability, and Affordable solution, OpenVZ is the platform that you should consider. KVM offers private virtualized hardware as well as a network card, disk and graphics adapter, and bonded resources for inflated reliableness and customizability. KVM packages are the best opt for serious resellers, game servers, small businesses, and medium-sized enterprises.
I hope that with this small article you have understood the most important concepts of virtualization and know the advantages and disadvantages offered by each type of virtualization.