Re: [Xen-users] Guest Systems Migration from x86 <-> x86_64 ?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> simple Problem, i have 2 Servers with Xen3.0.3:
>
> SRV1: Intel Dual 2 Core 64 Bit
> SRV2: Intel Pentium 4 32 Bit
>
> Can i Migrate (Copy from Image) a Guest Domain (e.g. gentoo-x64.img) from
> my SRV1 and start it on SRV2 ?

You're just wanting to copy the disk image, rather than do an xm migrate?

I'll sum up the various combinations (PV = paravirtualised guest, HVM = fully 
virtualised guests).

Compatibility:

x86_64 hypervisor can run: 64-bit PV, {64-bit HVM, 32-bit/PAE HVM, 32-bit HVM 
< - if it has HVM support in hardware}

x86_32/PAE hypervisor can run: 32-bit/PAE PV, {32-bit PAE HVM, 32-bit HVM <- 
if CPU has HVM support in hardware}

x86_32 hypervisor can run: 32-bit PV, {32-bit HVM <- if CPU has HVM support in 
hardware}

If you have, e.g. a 32-bit HVM guest, then you can run that on any Xen 
hypervisor.  A 32-bit PV guest will run on either x86_32 or x86_32/PAE Xen 
*with a different kernel for each*.  A 64-bit PV guest will only run on 
x86_64.

Does that answer your question?

Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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