Hi Gianluca,
My educated guess...When you live migrate a VM, its state in memory is copied over to the new host, but the VM still remains online during this period to minimise downtime. Once its state in memory is fully copied to the new host, the VM is paused on the original host, its memory resynchronised one last time & then brought up on the new host.

So whilst the entire process took 39 seconds, actual downtime was only 133ms.

Doug

On 27 January 2017 at 09:34, Gianluca Cecchi <gianluca.cecchi@gmail.com> wrote:

Hello,
I was testing put host into maintenance on 4.0.6, with 1 VM running.
It correctly completes the live migration of the VM and I see this event in pane:

Migration completed (VM: ol65, Source: ovmsrv06, Destination: ovmsrv05, Duration: 39 seconds, Total: 39 seconds, Actual downtime: 133ms)

What is considered as "Actual downtime"?

Thanks,
Gianluca

_______________________________________________
Users mailing list
Users@ovirt.org
http://lists.ovirt.org/mailman/listinfo/users

Doug