Should I choose KVM or OpenVZ for my VPS?

BillEssley

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Feb 19, 2013
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When I look into some VPS offers packages on the forum, I see web hosting sites offering these packages with names KVM or OpenVZ. I don't know which is better and how to choose for my site (My sites are built on wordpress CMS or custom site base on PHP languages). Please share your advice.
 

hostslim

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It really depends on the provider. Some oversell on OVZ, so then KVM is beter or XEN. But OVZ is fine if your provider can tell you how much actual resources you are able to use.
 

ElixantTechnology

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OpenVZ and KVM are both made in such a way that you can over-commit CPU & Memory, however KVM is made so that you *can not* over-commit storage. So it is pure myth that KVM boxes are less oversold than an OpenVZ box. The benefits of KVM would be the fact that you can utilize your own custom Kernel (as with Xen), though for more this isn't exactly necessary. Also, people speak as if overselling is the devil... No, there wouldn't be a VPS industry without overselling. I recently did a study with a test node with OpenVZ (gave out a bunch of free VPS).

I was able to over commit a VPS node that had an E3-1231v3 CPU and 32GB of Memory. The node has committed 150GB of memory to 300 virtual machines, however at peak hours the system only utilized about 15-16GB of system memory. This shows that many people that get VPS don't fully utilize them or they buy them to sit there and rot. Now, with numerous benchmarks I found absolutely no performance degradation either...

OpenVZ is a great platform if you don't have the specific need to manage your own Kernel, and is has much less overhead than that of KVM of Xen. In fact, you will notice that the majority of providers no longer even utilize Xen due to its excessive overhead. For best performance, just pick and choose your hosting provider rather than the Virtualization platform that they utilize, unless your specific needs are that you must have a custom kernel.
 

LowEndXeon

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KVM will give you dedicated resources. But yet, OpenVZ i find is better due to price and is very light on resources. Normally hosted on a good dedicated node/cluster too!
 

tarunap

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KVM has much better isolation than OpenVZ and in my experience KVM gets better performance as well.
 

Cherin

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I prefer XEN is good. XEN Allows your to run on several Operating system. You can experience High performance because Here you get SWAP Memory allocation Which helps to free up the RAM and allows to run multiple Application at a time on a huge load server.
 

hmb-robert

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KVM and openVZ servers has some basic differences such as KVM is true virtualization where the VPS operates as its own server, independently of the host node. OpenVZ is a container style of virtualization which relies on the host node's kernel. KVM has no restrictions in terms of functionality, but it has more overhead than OpenVZ. OpenVZ is constrained by the host node kernel, but it has less overhead in the containers themselves. KVM is generally more stable than OpenVZ.

KVM is not a dedicated environment. Both virtualizations share host CPU and network port among all VPSs, I will suggest you to go for a KVM server.
 
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