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You plan to deploy several Azure virtual machines.
You need to ensure that the services running on the virtual machines are available if a single data center fails.
Solution: You deploy the virtual machines to a scale set.
Does this meet the goal?
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Explanations
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A. B.B
This answer does not specify that the scale set will be configured across multiple data centers so this solution does not meet the goal.
Azure virtual machine scale sets let you create and manage a group of load balanced VMs. The number of VM instances can automatically increase or decrease in response to demand or a defined schedule. Scale sets provide high availability to your applications, and allow you to centrally manage, configure, and update many VMs.
Virtual machines in a scale set can be deployed across multiple update domains and fault domains to maximize availability and resilience to outages due to data center outages, and planned or unplanned maintenance events.
https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/availabilityYes, deploying the virtual machines to a scale set meets the goal of ensuring that the services running on the virtual machines are available if a single data center fails.
A scale set is an Azure service that allows you to deploy and manage a set of identical virtual machines. With a scale set, you can automatically scale the number of virtual machines in the set based on demand, and you can distribute the virtual machines across multiple fault domains and update domains to increase availability.
Fault domains are groups of virtual machines that share a common power source and network switch, but are physically separated within a data center. By distributing virtual machines across fault domains, you can ensure that if one fault domain fails, the other virtual machines in the set continue to operate.
Update domains are groups of virtual machines that are updated and rebooted together in a coordinated manner. By distributing virtual machines across update domains, you can ensure that not all virtual machines in the set are rebooted at the same time, which helps maintain availability.
By deploying the virtual machines to a scale set and distributing them across multiple fault domains and update domains, you can ensure that the services running on the virtual machines are available if a single data center fails.
