[vbox-dev] In need of facts

Maxime Dor maxime.dor at altherian.org
Fri Mar 22 01:41:38 PDT 2013

Thank you Alex, I think it just clicked in my head what the core difference
Reading again on the Internet, I got confused by the fact that ESX used a
readhat kernel, but ESX doesn't actually run on it, but run under it after
some "magic".

But you're right, the most important is that it feels bare-metal, and I am
yet to see perf differences. Virtualbox just rocks :)
And I totally agree with your P.S. on this one!

Thanks a bunch for clearing this up for me.

On 22 March 2013 09:22, Alexey Eromenko <al4321 at gmail.com> wrote:

> Hmm...
> Type 1 means that the virtualization layer aka hypervisor sits below the
> OS kernel. (VMware ESX/i, Xen, Hyper-V)
> Type 2 means that the virtualization layer aka hypervisor sits above the
> OS kernel. (example KVM, VirtualBox)
> There is no way in the world to change type. *but* there is a way to
> optimize the O. S to bare-metal and server needs, so type 2 gives you
> type1-like performance, features and user experience. RHEV (Red Hat
> Enterprise Virtualization) does just that - it is a bare-metal minimal
> Linux distro, but it is targeted at remote usage, like ESX with vSphere.
> (it runs KVM, so it's type 2, but users think it is type 1) and it's
> commercial.
> It is likely, that Oracle has bare metal commercial solution based on
> minimal Linux and VirtualBox, known as Oracle VDI, but I haven't tried it.
> In short it does not matter if it works above or below the kernel, and
> there is no proof, that type 1 is any faster than type 2. Making the
> solution that "feels" bare-metal is important, and can be done with either
> type.
> Example : the Open Stack cloud is absolutely server-targetted, and guess
> what? It supports both Xen (type 1) and KVM (type 2) hypervisors. (adding
> VirtualBox to OpenStack is possible, if anyone volunteers to maintain the
> Open Stack-vbox driver)
> P. S: Hell, we must beat the "hype"  part from the hypervisor.
> -Alexey Eromenko "Technologov"
> Sent from Galaxy S III
> _______________________________________________
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> vbox-dev at virtualbox.org
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