ExpertMedium1 markMultiple Choice
AZ-305 · Question 36 · Domain 3.2: High Availability
You are designing the compute architecture for a new application using Azure Virtual Machines.
The business requires a 99.99% Service Level Agreement (SLA) for VM uptime.
Which TWO architectural patterns can you use to achieve this SLA? (Select TWO)
You are designing the compute architecture for a new application using Azure Virtual Machines.
The business requires a 99.99% Service Level Agreement (SLA) for VM uptime.
Which TWO architectural patterns can you use to achieve this SLA? (Select TWO)
Answer options:
A.
Deploy two or more VMs in an Availability Set.
B.
Deploy two or more VMs across different Availability Zones in the same region.
C.
Deploy a single VM using Premium SSD managed disks.
D.
Deploy VMs using Virtual Machine Scale Sets configured with flexible orchestration across Availability Zones.
E.
Deploy two VMs in the same Availability Zone and place an Azure Standard Load Balancer in front of them.
How to approach this question
Memorize Azure VM SLAs: Single VM (Premium SSD) = 99.9%. Availability Set = 99.95%. Availability Zones = 99.99%.
Full Answer
Deploy two or more VMs across different Availability Zones in the same region., Deploy VMs using Virtual Machine Scale Sets configured with flexible orchestration across Availability Zones.
Microsoft guarantees different SLAs based on the deployment model. A single VM with Premium SSDs gets 99.9%. Two or more VMs in an Availability Set (different racks in the same datacenter) get 99.95%. To achieve a 99.99% SLA, you must deploy two or more VMs across Availability Zones (different physical datacenters within a region). This can be done manually or by using Virtual Machine Scale Sets configured for zone redundancy.
Common mistakes
Thinking Availability Sets provide 99.99%. They only provide 99.95%.
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