[opensource] Virtualization Technologies (Xen)

Brian Dittmer dittmer.6 at osu.edu
Thu Oct 19 14:33:43 EDT 2006


Srini,

An alternative to VMWare (if that's the type of virtualization you need) 
is Parallels workstation.  It's very reasonably priced and from my 
experience on an x86 Mac works well.

http://www.parallels.com/

-Brian

Jim Dinan wrote:
> Srini wrote:
>> Does anybody have any links or documentation for installing Xen on an 
>> existing CentOS server so I can install other CentOS servers on top 
>> of it for separating Webserver with DNS?
>> Also, is it advisable to use Xen or should I use VMWare if I intend 
>> to use virtualization for a small business?
>>
>> Thanking you in advance for your efforts in helping me.
>
> Hi Srini,
>
> You can get commercial support for Xen through Xen Source.  Xen also 
> has lots of corporate backing including Intel, AMD, and Microsoft.  
> However, Xen relies on paravirtualization which means the guest 
> operating systems need to be modified to cooperate with Xen.  In the 
> context of Linux, this is no problem and it's easy to get linux guests 
> running inside Xen.  However, windows is not yet available as a Xen 
> guest (hopefully soon).  VMWare uses a different approach where it 
> modifies the binary image in memory, allowing you to run pretty much 
> any OS unmodified.  This is slower but more flexible for legacy OSes.  
> So, if you absolutely need to run windows on one of your VMs Xen may 
> not be the right choice at present.
>
> The reason you have to fiddle with the OS is because the x86 has not 
> traditionally been designed to be compatible with virtualization.  Now 
> that Intel and AMD have introduced virtualization-friendly extensions 
> in their latest chips, I would expect these restrictions to change.  
> Also, if you do purchase a system that you plan to run a VMM on, make 
> sure it has a CPU that supports these extensions.
>
> Documentation for Xen is available here:
> http://www.cl.cam.ac.uk/research/srg/netos/xen/documentation.html
>
> Best of luck,
>  - jim.
>



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