What should you create?

You plan to move a distributed on-premises app named App1 to an Azure subscription.

After the planned move, App1 will be hosted on several Azure virtual machines.

You need to ensure that App1 always runs on at least eight virtual machines during planned Azure maintenance.

What should you create?
A . one virtual machine scale set that has 10 virtual machines instances
B . one Availability Set that has three fault domains and one update domain
C . one Availability Set that has 10 update domains and one fault domain
D . one virtual machine scale set that has 12 virtual machines instances

View Answer

Answer: D

Explanation:

A virtual machine scale set is a group of identical virtual machines that are automatically distributed across fault domains and update domains in one or more placement groups1. A fault domain is a logical group of underlying hardware that share a common power source and network switch, and a failure in one fault domain will not affect virtual machines in other fault domains2. An update domain is a logical group of underlying hardware that can undergo maintenance or be rebooted at the same time3.

By creating a virtual machine scale set with 12 instances, you can ensure that App1 has high availability and scalability. You can configure the scale set to have a minimum number of instances that must always be running, and a maximum number of instances that can be scaled up or down based on demand or a schedule. You can also configure the scale set to use automatic OS image upgrades, which will apply updates to the virtual machines in batches, ensuring that at least one instance is always running during the upgrade process.