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How to compare the three virtual technologies in VPS, I believe that many inexperienced people are helpless about this, for this reason this article summarizes the causes and solutions of the problem, through this article I hope you can solve this problem.

Many people see the same configuration VPS price difference is very big, even do not understand, in fact, VPS uses a lot of virtual technology types, such as OpenVZ, Xen, KVM, Xen and HVM and PV. In +XEN pv is semi-virtualization, hvm is full virtualization, pv can only be used for linux kernel systems, higher efficiency, hvm can virtualize all common operating systems (you can use windows),+ theoretical efficiency is slightly lower than pv, in addition, hvm requires cpu virtualization instruction support, pv does not have this requirement. KVM is an emerging virtualization project. There are not many VPS vendors selling KVM, but KVM virtual technology is said to be more powerful. OpenVZ is an operating system-level full virtualization solution similar to Linux-VServer, and there are currently more VPS service providers based on Xen and OpenVZ. The editor briefly introduces and compares several common technologies used by VPS OpenVZ, Xen, KVM, so that you can choose your own suitable VPS.

OpenVZ

OpenVZ is an operating system level virtualization technology that is a layer of application on top of the underlying operating system, which means easy to understand and low weight overhead, which generally means better performance. However, OpenVZ is more flexible to configure, giving black-hearted service providers the opportunity to change lower limits.

Advantages: Now sold outside this type, licensed memory are large, CPU is also strong, and many sellers, comparability is also very strong. Excellent value for money.

Disadvantages: Oversold, no oversold, resulting in a variety of stone plate, diamond plate. The associated cpu is also over-fragmented resulting in performance appreciation less than 1/10th of its stated value. There is memory, basically OpenVZ technology is not exclusive, are shared, others more you less, and the biggest disadvantage of this technology is that memory down directly after the crash. There are also various inconveniences of opening a VPN.

Xen

Xen is a semi-virtualization technology, it is not a real virtual machine, but equivalent to running a kernel instance, can freely load kernel modules, virtual memory and IO, stable and predictable. Xen+pv+ and Xen+hvm, the difference is that pv only supports linux, while hvm supports win system.

Advantage: Memory monopolization, small but guaranteed to allocate. Part of the virtual technology determines that even if it is oversold, it will not be too outrageous. Therefore, even if the average hen exceeded, it rarely led to stone dishes. Of course, there is no doubt about it. In addition, even if the memory is low, it will not fail, but it will not respond for a while.

Disadvantages: small memory, small hard disk, small bandwidth (the above 3 points are compared with openvz at the same price). Because there is no way to oversell, in order to make money can only put these three basic configuration down. There is also a lack of suppliers, and most of them do not explicitly say pv or hvm when they say xen. In fact, pv performance is better than hvm.

KVM

Advantages: Similar to xen, better than xen is that kvm is completely virtual, so regardless of the difference between pv and hvm, all kvm + virtual technologies can be installed in various linux distributions and various win distributions, regardless of whether the vendor has indicated on the home page whether to support win, as long as you configure enough win to run, then you can definitely install +, just a matter of method.

Disadvantages: precisely because kvm can install any type of operating system, resulting in the toss emperor even installed win2003 in the 128m machine (up + directly after all the cpu and memory are used for hard disk IO, do not understand these people want to do god horse). The result is that all kvm neighbors have to look after your neighbors. In this way, as long as there are 5 or 6 such torturers under a node, sorry, your hard disk is basically a stone disk.

Personally, I prefer Xen because it is an acceptable compromise for both suppliers and customers. Openvz oversold too much, kvm and so on to see RP, these 2 kinds are not suitable for those who do not want to toss only want to do the station stationmaster.

After reading the above, do you know how to compare the three virtual technologies in VPS? If you still want to learn more skills or want to know more related content, welcome to pay attention to the industry information channel, thank you for reading!

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