Virtual Machines in Azure Availability Sets: Configuring platformFaultDomainCount

Configuring platformFaultDomainCount in Azure ARM Templates for Maximum Availability

Question

Your company has an Azure subscription.

You need to deploy a number of Azure virtual machines to the subscription by using Azure Resource Manager (ARM) templates.

The virtual machines will be included in a single availability set.

You need to ensure that the ARM template allows for as many virtual machines as possible to remain accessible in the event of fabric failure or maintenance.

Which of the following is the value that you should configure for the platformFaultDomainCount property?

Answers

Explanations

Click on the arrows to vote for the correct answer

A. B. C. D.

D.

The number of fault domains for managed availability sets varies by region - either two or three per region.

https://docs.microsoft.com/en-us/azure/virtual-machines/windows/manage-availability

The "platformFaultDomainCount" property in Azure Resource Manager (ARM) templates specifies the number of fault domains in an availability set. Fault domains are a logical group of virtual machines in an Azure data center that share a common power source and network switch. They're also subject to potential hardware failures, maintenance events, and software updates.

When you create an availability set, Azure distributes your virtual machines across multiple fault domains. If a single fault domain experiences an outage, the virtual machines in the other fault domains will remain accessible, providing high availability for your application.

The value you should configure for the "platformFaultDomainCount" property depends on the region and the Azure compute service you're using. Different Azure regions have different numbers of fault domains, and some Azure compute services may have specific requirements for the number of fault domains.

However, in general, the maximum value you can configure for the "platformFaultDomainCount" property is typically the number of fault domains available in the Azure region you're using. This ensures that the maximum number of virtual machines can remain accessible in the event of fabric failure or maintenance.

Therefore, in this case, the correct answer would be D. Max Value. You should configure the "platformFaultDomainCount" property with the maximum value available in the Azure region you're using to ensure the highest level of availability for your virtual machines.