[Xen-devel] Re: New to Xen: Can Xen Work with OpenMosix?

[David Rottenburg <david_rottenburg@xxxxxxxxx>]

George Lenzer wrote:
> Apologies if this is the wrong place to post this question.  In that event,
> please point me in the right direction.
>
> My question is whether or not I can use Xen with OpenMosix.  The upshot of what
> I'm attempting to do is this:
>
> 1. Build a two to four node cluster using OpenMosix for "raw horsepower"
> 2. Use Xen on the OpenMosix cluster to divide the "raw horsepower" any way that
> I need it
>
> I am specifically interested in setting up two or more Xen Domains for full
> desktop utilization over VNC with Fedora Core 3.  I would then use the rest of
> the system for various internal servers: DNS, HTTP, DHCP, Icecast (streaming
> media), MySQL, and the like.  The main goals in clustering + paravirtualization
> would be:
>
> a. High availability (HA)
> b. HA and session portability for the desktop domains (using the -live option)
> c. High performance compute power (thanks to clustering)
>
> However, seeing that both OpenMosix and Xen modify the host kernel, I am not
> certain that this will work at the host system level.  I'm also not sure if
> using multiple Xen systems and attempting to cluster the Xen guest systems would
> work either.
>
> Any info I can get regarding this will also help me make a decision on how I
> will upgrade my current system (a standard SMP PII 450 system running Redhat 9
> for desktop via VNC).  I am currently thinking of setting up a cluster of two to
> four AMD Athlon 64 systems.  But, if clustering won't work, I might consider a
> two way Opteron system once those become more readily available.
>
> Thanks,
> George Lenzer
>
>
>
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What you're trying to do won't work, since OpenMosix doesn't really 
support a computing model where any process can be migrated.  It 
primarily migrages computational context of a process, while the system 
calls stay put.  Xen is way too special of a way process, mostly system 
calls, to be migrated by OpenMosix.


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