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Difficulty: MediumConfigure VMs for High Availability

Nebula Streaming is deploying a new web application in the East Asia region. You configure an Availability Set named AvSet-Prod with three fault domains and five update domains. You deploy six virtual machines named VM1, VM2, VM3, VM4, VM5, and VM6 in sequential order into AvSet-Prod. During a planned Azure maintenance event that updates the underlying host hardware, which virtual machines are subject to being rebooted at the same time?

  1. VM1 and VM6Answer
  2. B
    VM1 and VM4
  3. C
    VM2 and VM5
  4. D
    VM3 and VM6

Answer

VM1 and VM6
The correct option is VM1 and VM6. In an Availability Set with 5 update domains, VMs are distributed sequentially across these domains: VM1 to Update Domain 0, VM2 to Update Domain 1, VM3 to Update Domain 2, VM4 to Update Domain 3, VM5 to Update Domain 4, and VM6 to Update Domain 0. During planned maintenance, Azure reboots virtual machines one update domain at a time. Therefore, VM1 and VM6 will be rebooted at the same time because they are in the same update domain.

Step-by-Step Solution

1
Determine the distribution of VMs across update domains.
Since there are 5 update domains (UD 0, 1, 2, 3, 4), the 6 VMs are assigned sequentially: VM1 to UD0, VM2 to UD1, VM3 to UD2, VM4 to UD3, VM5 to UD4, and VM6 back to UD0.
Azure distributes VMs in an Availability Set sequentially across the configured update domains to ensure high availability during planned maintenance.
2
Determine which domain is affected by planned maintenance.
Planned maintenance events reboot one update domain at a time.
Update domains are logical groupings of VMs and underlying physical hardware that can be rebooted at the same time.
3
Identify the VMs that share the same update domain.
VM1 and VM6 both share Update Domain 0.
Since VM1 and VM6 are in the same update domain, they are subject to being rebooted at the same time during host updates.

Key Concept

Availability Set Update Domains
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Topics

Configure VMs for High Availability

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