You are administrating an Azure environment for your company. You plan to deploy virtual machines (VMs) for a mobile application. You have the following requirements:
Ensure that all VMs use the Standard D3 size.
Ensure that at least two of the four servers must be available at all times.
Ensure that users of the application do not experience downtime or loss of connection.
You need to configure four VMs for application development.
Solution: Create a Virtual Machine Scale Set (VMSS) that has an instance count of 4.
Does the solution meet the goal?
A.
Yes
B.
No
Yes.
a Scale set automatically assigns different update and fault domains to each instance so it would prevent downtime.
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@Rinie is right:
Fault domains
A fault domain is a logical group of underlying hardware that share a common power source and network switch, similar to a rack within an on-premises datacenter. As you create VMs within an availability set, the Azure platform automatically distributes your VMs across these fault domains. This approach limits the impact of potential physical hardware failures, network outages, or power interruptions.
Update domains
An update domain is a logical group of underlying hardware that can undergo maintenance or be rebooted at the same time. As you create VMs within an availability set, the Azure platform automatically distributes your VMs across these update domains. This approach ensures that at least one instance of your application always remains running as the Azure platform undergoes periodic maintenance. The order of update domains being rebooted may not proceed sequentially during planned maintenance, but only one update domain is rebooted at a time.
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/regions-and-availability
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