On 01/18/2012 03:18 AM, Gianluca Cecchi wrote: > symbol "--->" corresponds to live migration > > 6.1 --> 6.1 ok > 6.1 --> 6.2 ok > 6.2 --> 6.2 ok
Yes, those are all supported migration patterns. > > but > > 6.2 --> 6.1 ko This is expected - there is no guarantee of downgrade compatibility, only upgrade compatibility. The qemu on 6.2 has different machine models for 6.1 vs. 6.2 hosting, so that it can continue to run a guest migrated in from a 6.1 host. But if a guest is started from scratch on 6.2 rather than migrated in from 6.1, then chances are quite high that the state of the machine will be using 6.2 features that are not understood by 6.1, and thus you can't migrate to a downgraded qemu. -- Eric Blake [email protected] +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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