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

[Daniel P. Berrange]

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.

Daniel
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