Re: [Xen-users] OpenMosix and Xen

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> Thank you, everybody. You agree about that what I'm thinking is not a good
> idea, or at least, it is very difficult. I am sure that it's dificult and I
> don't know if I will get something that worths it.

Running Xen on OpenMosix can't really be done because Xen isn't an 
application.  You can, however:
* migrate Xen virtual machines
* run OpenMosix within Xen virtual machines

The combination of these should be able to do whatever you want.

> I have been reading the Xen Roadmap and it says that in Xen 3.0 release,
> one new feature will be:
>
>
>    - *Cluster management.* We wish to add tool support to provide a
>    better unified interface to managing a cluster of Xen machines. This
> would include features such as automatic use of VM live-migration to
> load-balance across a cluster, and the ability to 'evacuate' VMs from a
> node before shutting it down for maintenance etc.
>
> And this is what I am looking for!!!, I thought that I could do this on
> OpenMosix, but you say that I have to look for another Cluster Technology,
> which one? Have you ever done something like this?

You can do this now, manually: Xen can migrate virtual machines around the 
cluster with almost no downtime (a few hundred milliseconds).  This works 
right now - you can download the 2.0 tree and try it out (there are various 
howtos in the mailing list archives).

The roadmap feature is to produce tools that'll manage this automatically for 
you using Xen's existing live migration tools.

Cheers,
Mark

> On 7/2/05, Vincent Hanquez <tab@xxxxxxxxx> wrote:
> > On Thu, Jun 30, 2005 at 06:20:52PM +0200, Miguel GÃmez wrote:
> > > I would like to mount Xen Virtual Machines on a OpenMosix Cluster. Can
> > > I
> >
> > do
> >
> > > that? I have seen a Vincent Hanquez patch in OpenMosix sourceforge
> > > page.
> >
> > not really. the patch is here to have an openmosix kernel running under
> > Xen as Mark said.
> >
> > > The thing is that I think that if you use that patch, you can make a
> >
> > Cluster
> >
> > > with a lot of Virtual Machines. But what I want to do is the opposite,
> > > I want to make a Cluster with real machines, and then I would like to
> >
> > mount
> >
> > > Virtual Machines on that Cluster. I know, I would like to do a lot of
> >
> > things
> >
> > > and they are a bit dificult, so I need your help and support.
> >
> > openMosix is not what you are looking for, because openMosix migrates
> > object at the process level, whereas VM are a whole operating system.
> >
> > At a basic start, you can write a small application that will
> > communicate with other node for gathering lots of heuristic (cpu load,
> > mem load, ...) and execute xm migrate locally.
> >
> > that might look like an openmosix userspace scheduler actually.
> >
> > --
> > Vincent Hanquez

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