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Zorluk: KolayDesign Compute High Availability

An organization is designing a high availability compute solution in Azure for a legacy line-of-business application. The application will run on two virtual machines. The organization has the following requirements:
- The virtual machines must be protected against a datacenter outage within the Azure region.
- The solution must achieve a virtual machine uptime SLA of 99.99%.

Which two configurations should you recommend to meet these requirements? (Select two.)

  1. Deploy the virtual machines as individual instances across different Availability Zones, placing one in Zone 1 and the other in Zone 2.Cevap
  2. Deploy the virtual machines using a Virtual Machine Scale Set (VMSS) in Flexible orchestration mode spread across multiple zones.Cevap
  3. C
    Deploy both virtual machines within a single Availability Zone.
  4. D
    Deploy the virtual machines in an Availability Set.

Cevap

Deploy the virtual machines as individual instances across different Availability Zones, and deploy the virtual machines using a Virtual Machine Scale Set in Flexible orchestration mode spread across multiple zones.
To achieve a 99.99% Virtual Machine uptime SLA and protect against datacenter outages in Azure, virtual machines must be distributed across multiple Availability Zones. Individual VMs placed in different zones (such as Zone 1 and Zone 2) or a Virtual Machine Scale Set configured with Flexible orchestration and spread across zones satisfy this requirement.

Adım Adım Çözüm

1
Analyze the high availability and SLA requirements.
The requirements specify protection against a datacenter outage and a 99.99% virtual machine uptime SLA.
This determines that the VMs must be placed across different physical datacenters, which translates to Azure Availability Zones.
2
Identify configurations that utilize multiple Availability Zones.
Individual VMs deployed in separate zones (Zone 1 and Zone 2) and a Virtual Machine Scale Set configured for Flexible orchestration spread across zones are identified as valid compute configurations.
Both methods physically isolate the VMs in different zones within the region, providing the required zone-redundancy and meeting the 99.99% SLA.
3
Eliminate configurations confined to a single zone or datacenter.
Deploying within a single Availability Zone or using an Availability Set are ruled out.
These configurations place VMs within the same failure boundary, failing to protect against datacenter outages and offering lower uptime SLAs (99.9% and 99.95% respectively).

Anahtar Kavram

Azure Availability Zones and VM SLAs
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