Ah... Never thought I can switch it to 'Auto'. Actually it makes sense -  we can't be sure if all nodes in cluster are the same -  like my case.

Now all  VMs are in Auto mode.

Thanks for the clarification,  Sharon.

Best Regards,
Strahil Nikolov

On Oct 27, 2019 17:30, Sharon Gratch <sgratch@redhat.com> wrote:

The "manual migration" option is only a default value. You can change the migration mode to "automatic" mode if you prefer.

When you enable Host CPU Pass-Through for a VM then the migration default value is auto set to "manual migration" in UI because it's not sure if this VM should be automatically migrated as part of internal events (such as load balancing policies or host turning into maintenance mode), without letting the user controlling it.

Sometimes there are few destination hosts to migrate to and we want to let the user controlling that since performance may decrease or migration may fail.

But if you are sure that the cluster contains hosts with identical cpu model and identical number of sockets, threads and cores as the source host, and you don't mind that VM will be migrated whenever required, then you can definitely change the migration value to "Allow manual and automatic migration".


On Sun, Oct 20, 2019 at 2:42 AM Strahil Nikolov <hunter86_bg@yahoo.com> wrote:
Hello Community,Dev,

does anyone know why only "Manual Migration" allows passing through the CPU from the Host to the VM ?

In many environments, the Clusters are having the same CPU model in order to avoid any issues. Have you observed any issues with that ?

Best Regards,
Strahil Nikolov
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