Examtopics

To account for the extreme case where one zone fails or an entire group of instances stops responding, Compute Engine strongly recommends overprovisioning your managed instance group by at least 50%. Spreading instances across three zones already helps you preserve at least 2/3 of your serving capacity and the other two zones in the region can continue to serve traffic without interruption. By overprovisioning to 150%, you can ensure that if 1/3 of the capacity is lost, 100% of traffic is supported by the remaining zones. You need to select the "Multizone" option (or the --region flag if you're using the gcloud command) when creating a managed instance group. It is only possible to create regional managed instance groups. You cannot create regional unmanaged instance groups. Reference: https://cloud.google.com/compute/docs/instance-groups/distributing-instances-with-regional-instance- groups#provisioning_the_correct_managed_instance_group_size