Xen Virtualization

Xen Virtualization

[Tércio Alexander]

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Hello.

 

Please, I need help.

 

Is possible I made 1 VM with 12 GB RAM with 2 servers with 8 GB RAM each ?

 

Please I need your answer.

 

Thank you !

 


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Re: Xen Virtualization

[Christoph Egger]

On Wednesday 13 January 2010 19:18:43 Tércio Alexander wrote:
> Hello.
>
>
>
> Please, I need help.
>
>
>
> Is possible I made 1 VM with 12 GB RAM with 2 servers with 8 GB RAM each ?
>

I think, this is a very interesting question.

Xen has to be able to create and bringup the guest on both machines
and they need to be synchronized via live migration mechanism.
I think with Xen's PoD feature, Xen can bring up the guest with 12GB RAM on a 
8GB machine and then Xen needs to be able to move it partially to the second 
machine.

Also scheduling of vcpu's on physical cpus has to be handled, i.e. first half
of vcpus is scheduled on first machine, second half on second machine.

I don't think this is possible with Xen now but this is surely a nice feature
for a future Xen version.

Christoph


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Re: Xen Virtualization

[Daniel Stodden]

On Wed, 2010-01-13 at 13:18 -0500, Tércio Alexander wrote:
> Hello.
> 
>  
> 
> Please, I need help.
> 
>  
> 
> Is possible I made 1 VM with 12 GB RAM with 2 servers with 8 GB RAM
> each ?

NUMA support is good. But not that good, sorry. :)

You'd need a distributed OS, e.g. OpenSSI, which you likely don't have.
That'd still be two VMs, just hiding.

Or some sw/hw DSM subsystem in the hypervisor.
Which you rather won't get.

Daniel