Re: [Xen-users] How to set up a domU to run on multiple dom0s

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-02-10 at 13:25 +0100, Robin Axelsson wrote:
> I'm wondering if it is possible to set up one virtual machine to use
> CPU/RAM resources located on several physical machines where some of
> these resources are shared through protocols such as MPI.
> 
> Say that I have 32 CPU cores on two separate physical machines so what
> I'm essentially asking is whether it is possible to set these machines
> up so that the operating system sees 64 computing cores in the virtual
> machine / domU?

No, I'm afraid it is not. Xen carves up individual hosts and can allow
you to transfer a running VM on a very coarse time scale to another host
but does not support running one VM across multiple hosts
simultaneously.

However I see no reason why whatever higher level tools which you would
use on two non-virtualised physical hosts to provide some illusion of a
single machine shouldn't work on two VMs hosted on different hosts (or
even the same host for that matter).

Ian.


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