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AZ-140 · Question #86

You are chairing a team meeting where you need to talk about the Ephemeral OS Disks with your team members. Which of the following statement(s) can you use to rightly describe the Ephemeral OS…

The correct answer is A. Ephemeral OS disks are the disks that are built on the local VM(Virtual Machine) storage D. Ephemeral disks are available in all Azure regions. Ephemeral OS disks leverage local VM storage for improved performance and are widely available across Azure regions.

Submitted by chen.hong· Apr 18, 2026Plan and implement an Azure Virtual Desktop infrastructure

Question

You are chairing a team meeting where you need to talk about the Ephemeral OS Disks with your team members. Which of the following statement(s) can you use to rightly describe the Ephemeral OS Disks? (Choose two)

Options

  • AEphemeral OS disks are the disks that are built on the local VM(Virtual Machine) storage
  • BEphemeral disks are not good for stateless apps.
  • CEphemeral OS disk results in having higher write/read latency to the disk
  • DEphemeral disks are available in all Azure regions

How the community answered

(34 responses)
  • A
    88% (30)
  • B
    9% (3)
  • C
    3% (1)

Why each option

Ephemeral OS disks leverage local VM storage for improved performance and are widely available across Azure regions.

AEphemeral OS disks are the disks that are built on the local VM(Virtual Machine) storageCorrect

Ephemeral OS disks are directly built on the local VM storage (either the VM cache or temporary SSD), rather than being persisted on Azure Storage, which contributes to lower latency and faster re-imaging.

BEphemeral disks are not good for stateless apps.

Ephemeral disks are highly suitable for stateless applications because they don't persist data across reboots, making them ideal for workloads where the OS disk is disposable.

CEphemeral OS disk results in having higher write/read latency to the disk

Ephemeral OS disks typically result in lower write/read latency because they utilize the VM's local storage, which offers faster I/O performance compared to remote Azure Storage.

DEphemeral disks are available in all Azure regionsCorrect

Ephemeral OS disks are a widely available feature in Azure and can be used in all Azure regions where supported VM sizes are present.

Concept tested: Ephemeral OS disk characteristics

Source: https://learn.microsoft.com/en-us/azure/virtual-machines/ephemeral-os-disks

Topics

#Ephemeral OS Disks#VM Disks#Azure Virtual Desktop Storage#Virtual Machine Optimization

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