Types of virtualization: OVZ and KVM

When choosing a service tariff, a person also chooses a virtualization method for the server. We offer a choice of virtualization at the level of the operating system OpenVZ and hardware virtualization KVM.

It is impossible to change the type of virtualization after initial order, since the servers are located on different hardware platforms. You will have to order a new server, move the project and abandon the old server.

Compare types of virtualisation

OpenVZ
KVM
OS from the list: Debian, CentOS, UbuntuLinux, Windows, FreeBSD, and other distribution
Resources change without reboot (hard disk, memory, CPU)memory and the processor will change after a reboot, a hard disk - only after calling support.
Service tariff change without rebootChange Service tariff by calling support. The server will be unavailable for 1-2 hours
Soft limits: maximum server performance may deviate upwards or downwardsHard limits: each server receives the dedicated resources
Restriction on the launch of high-loaded projects. It is forbidden to run Java-applications, mass mailings and proxy traffic. TUN / TAP off.The ability to run any projects (except for distributed computing systems)

OpenVZ

OpenVZ virtualization - operating system level virtualization. The technology is based on the Linux kernel and allows you to create and run on the same physical server isolated from each other copies of the selected operating system (Debian, CentOS, Ubuntu). Installing another OS is not possible, as virtual servers use a common Linux kernel.

The technology is notable for ease of server management: a user can in his personal account independently add a number of resources (memory, processor, hard disk) or switch to another service tariff with the same virtualization. Resource changes are applied automatically, without restarting the server.

On servers with OpenVZ virtualization you should never run:

  • Services for the organization of proxy of any kind of traffic
  • Streaming services
  • Game servers
  • Distributed computing systems or elements of them (eg, bitcoin mining)
  • Mass mail sending service, even if they are used for legitimate purposes
  • Java-based applications
  • Other resource-intensive applications
Such projects create an uneven load on the parent server and can interfere with neighboring virtual machines.

KVM virtualization

KVM (Kernel-based Virtual Machine) is a hardware virtualization technology that allows you to create on a host machine complete virtual copy of a physical server. KVM allows you to create a virtual server that is completely isolated from its “neighbors” with its own OS kernel, which the user can customize and modify to suit his own needs without restrictions. Each such server is allocated its own area in RAM and space on the hard disk, which increases the overall reliability of the server.

You can install any operating system to choose from (Debian, CentOS, Ubuntu, FreeBSD, Windows Server), or install your own distribution (in the VMmanager panel, in the ISO images section, click the Create button and add your own ISO image).

The change of the Service tariff is possible only calling support.

Considering the features and advantages of KVM virtualization, its service tarrifs are more expensive than similar ones with OpenVZ virtualization.

On servers with KVM virtualization, the customer is prohibited to run systems or elements of distributed computing systems (for example, bitcoin mining).