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  1. #1

    * What is the difference between OpenVZ and KVM?


    I am newbie in web hosting business. I want to clear about that what is the difference between openvz and kvm vps? Which one is better and why? Need help of the forum expert.

    Thanks in advance.

  2. #2
    Join Date
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  3. #3
    Join Date
    Feb 2006
    Kepler 62f
    KVM = full isolation, install from ISO
    OpenVZ = not real isolation, install from SolusVM image

    KVM is harder.
    OpenVZ is easier.

    OpenVZ has UBC and vswap methods.
    In most all cases, UBC sucks. It's an ancient method of calculating RAM usage.
    On UBC a "1GB" VPS is more like 384MB in reality.
    So to get 1GB of usable RAM, you need "3GB" available..
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  4. #4
    Join Date
    Apr 2012
    Both KVM and OpenVZ has advantages and disadvantages.

    What matters is the purpose of vps server. If you need full isolation and need to load your own kernels KVM is for you. Open VZ is fast but KVM is stable
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  5. #5
    Join Date
    Jan 2002
    This is a question that gets asked a lot, I suggest Googling, 'OpenVZ vs KVM' for some offsite articles and detailed information.

    In short:

    OpenVZ is easier, and often oversold. Some providers manage this better than others, however some providers use OpenVZ to sell 300GB of RAM on a machine with 32GB -actual- RAM. (Yes, this has happened).

    OpenVZ isn't as secure as KVM. If someone has access to the VPS node, they can easily enter your VPS by using the vzctl enter CTID command (where 'CTID' is your container ID). Shouldn't be an issue from a trustworthy provider, but worth noting.

    OpenVZ, assuming not oversold to death, can be slightly faster than KVM. Will you feel the difference? Maybe, but probably not. It's 'lighter' and doesn't require as much hostnode resources.

    KVM is more tamper proof, and more like managing a 'real' server.

    With KVM, you can utilize full disk encryption, which is a plus for those seeking an added level of security.

    With KVM you can use SELinux, on OpenVZ you can not. (Unless this has changed)

    KVM is generally more 'premium' than OpenVZ and slightly more expensive due to it not being oversold, or as oversold as OpenVZ. This means you should have a more stable service, without being impacted by your neighbors as much as you would with OpenVZ.

    I prefer KVM when it's an option, as I like to deploy production sites inside a KVM VPS. OpenVZ is fine if you just need something cheap, but I'm starting to lean more towards KVM every day. It's a bit more of a hassle to get setup, but assuming you're going to set it up once and be done it's not too bad in that regard.
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