[ovirt-users] Actual downtime during migration?

[Yedidyah Bar David]

On Fri, Jan 27, 2017 at 2:59 PM, Doug Ingham <dougti at gmail.com> wrote:
>> its memory resynchronised one last time
>
> Actually, thinking about it, rather than diffing all of the memory on the
> first host to resync it at the last moment, the hypervisor probably
> simultaneously copies the current state of memory & uses copy-on-write (COW)
> to write all new transactions to both hosts.
> Only a technical difference, but it'd greatly reduce how long the VM needs
> to be paused to complete a full sync.

Is this in 4.1? See also:

http://www.ovirt.org/develop/release-management/features/migration-enhancements/

Best,
-- 
Didi