[virt-tools-list] C'ant migrate with virt-manager or virsh

[Justin Clift]

On 03/02/2011, at 12:02 AM, Daniel P. Berrange wrote:
> On Wed, Feb 02, 2011 at 11:48:11PM +1100, Justin Clift wrote:
>> On 02/02/2011, at 11:25 PM, Bruno Lamps wrote:
>>> I was using fedora 13 (kernel 2.6.32) in one machine and fedora 14 (kernel 2.6.35) in other
>> 
>> Ahhh, that might be the problem.  One of the "fundamental" things for migration is that both
>> the source and destination hosts need to be *exactly* the same kernel version, kvm version, etc.
> 
> That's not actually true. The requirement is that the destination must
> offer the same, or a superset of, the features currently configured for
> the guest on the source host. This basically means that the KVM version
> must be the same or newer, and the guest machine type must be available
> on both hosts.
> 
> So migration with a OS family should work across version upgrades, eg
> from Fedora 13 to 14 to 15 should work in that direction. If you want to
> migrate in the reverse direction eg, from F15 to F14, you need to take
> extra care to set the guest machine type to a version that is available
> on both, and even then some problems may occur depending on how much
> older the target is than the source.
> 
> Migration from Fedora to RHEL or vica-versa will not work at all due
> to different machine types.

That's weird.  I've been told (more than once) that things have to match
exactly.  We don't even support live migration from AMD -> Intel or vice versa.

*sigh*