Comment 6 for bug 1912450

Hi, I noticed that you resized this vm and then confirmed it. If the update port has been completed before the confirmation is performed, it wouldn't work.

Automatic confirmation(https://docs.openstack.org/nova/latest/admin/configuration/resize.html#automatic-confirm) will be helpful.

I suggest using live migration instead or increasing the time of sleep, to make sure update port and delete port in the same ovs rpc loop cycle.