AZ-104 Certification Practice Question #184

Question

You have an Azure subscription.
You plan to use Azure Resource Manager templates to deploy 50 Azure virtual machines that will be part of the same availability set.
You need to ensure that as many virtual machines as possible are available if the fabric fails or during servicing.
How should you configure the template? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
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Accepted Answer

To ensure that as many virtual machines as possible remain available if the fabric fails or during servicing, we must maximize the number of fault domains and update domains. Setting `platformFaultDomainCount` to 3 (the maximum supported in most regions, including US East) distributes the 50 VMs across three physical racks so that a failure in one rack affects at most 17 VMs. Setting `platformUpdateDomainCount` to 20 (the absolute maximum) ensures that during planned maintenance, only a maximum of 5% (2 or 3 VMs) of the availability set is rebooted at one time.

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