KVM vs OpenVZ: The great VPS Cambodia debate

April 1, 2017

Which virtualization technology is better, OpenVZ or KMV? This question comes up often when a customer is looking into a VPS Cambodia.


 What a user should do first is to compare RAM and disk space, then look into which virtualization technology that the web hosting provider offers. While there’re many choices to choose from, like Hyper-V, Xen, VMware, let’s find the different between 2 more common types of virtualization: KVM and OpenVZ.

Differences between KVM and OpenVZ:

Firstly, the most basic difference between them is that OpenVZ can just only host Linux operating systems, while KVM is more flexible and can host Windows, Linux and other custom OS options.

Both the advantage and disadvantage of OpenVZ is the complete sharing of resources that it allows. OpenVZ uses a shared kernel with a layer of virtualization on top of the actual Linux OS. Because this kernel is shared by all users of VPS hosting Cambodia on this node, it is not customizable. Once you have hit your allocated RAM provided to you by the host, the remaining RAM becomes a free-for-all for the users on the server. This’s not a problem if you operate small apps, but you may be in trouble if you’re operating something more resource intensive.


KVM allows you to set minimum and maximum values to your resources, providing you to use only the resources that your apps need. This’s true, real hardware virtualization, meaning better performance from lower demands on the hypervisor. 100% of the hard disk and RAM resources are dedicated to 1 individual user. KVM provides a more isolated environment and gives the users their own kernel.

The risk of overselling:

Overselling is where a host’ll overcommit resources to certain accounts hoping that not every account uses up all those resources. While everything can be oversold, beware of shady hosting companies overcommitting OpenVZ systems and putting you on a system with so many containers. KVM can also be oversold, but it is better isolated. Because the OpenVZ hosts are usually oversold, OpenVZ servers are typically a cheaper option than KVM servers.

OpenVZ provides the end-user with scalability speed, and it is more affordable. KVM also offers private virtualized hardware including hard disk, graphics adapter and network card, and guaranteed resources for increased customizability and reliability. KVM plans are ideal for serious resellers, small businesses, game servers and the SME (small and medium-sized enterprises).



Remember that, with the best VPS Cambodia, OpenVZ is easier to install and maintain properly, while KVM takes far more networking knowledge. OpenVZ and their templates may be more friendly to the beginner in that aspect. If you’re simply an end-user, do not worry and go with a managed VPS provider.