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Hi,

OpenVZ:
Advantages: allows overselling. Very light weight. Can accommodate more Virtual Machines in a server.

Disadvantage: There is no per vps swap.

Why this is important:

OpenVZ will KILL your application if it goes beyond the limit, and this can cause some trouble. There are people out there who want to host oracle on a 64MB vps, and with such customers, using openVZ will lead to constant application crashes, which ultimately will be blamed on the provider. (This is actually something that is common with openvz/virtuozzo hosting in general; you can check some threads at wht).

With Xen, each vps has its own swap, and thus you get an EXACT dedicated server like environment, but with lesser resources. So here, the customers applications will NOT crash, but rather it will become slower. Also, majority of the applications, like apache, spamassassin expects a lot of memory, and openVZ makes memory a very valuable commodity.

So generally my recommendation is that: For friendly customers use openVZ, and use a lot of burst memory. For not-so-friendly customers, use Xen. And that is why we are providing transparent migration. You can start a customer on openVZ, and see how it works out, and if he is getting too many application crashes, you can move him to the SAME configuration on Xen, and he should be able to do fine, though his application would be slower.

With regards,
Dheeraj kumar.B
ehostpros.in

Xen is a para-virtualisation platform that gives you much of the dedicated server behaviour and OpenVZ is an operating-system level virtualisation system that is just a thin layer on top of the underlying OS.

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Hello Friends......

Thanks for sharing.Keep sharing more in the future.

Have a nice time ahead.

Thanks

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f anybody didn't notice, which I know wouldn't happen here, Slashdot posted a whitepaper of OpenVZ vz. Xen. The results seem to show why OpenVZ would be a perfect solution for Linux VPS' (disclosure: I still adore xen).

HTML Whitepaper:

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It is a nice sharing........

OpenVZ is an operating system-level virtualization platform based on a single Linux kernel which has been modified to support multiple Linux virtual environments (more commonly referred to as virtual private servers).

Xen is a paravirtualization platform which is very similar to hardware emulation. Paravirtualization works by creating an interface between the virtual environment's operating system and the hardware which queues and responds to operating system requests from operating systems modified to interact with the paravirtualization interface.

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OpenVZ uses a container format, so that a system is not completely a sandbox. It is a system that runs on a virtual computer, but an instance of an operating system chroot. It's perfect for sharing VPS systems, if a little fussy at times. Xen hypervisor instead is a full, which means that the operating system is installed on a virtual computer.
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Between openVZ and xen, I would say openVZ gives you greater flexibility.

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However I would like to look into an obvious question at that time i can not able to make exact idea about that thing.




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This is the main difference. Xen is a para-virtualisation platform that gives you much of the dedicated server behaviour and OpenVZ is an operating-system level virtualisation system that is just a thin layer on top of the underlying OS.

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