[Compute] Add AvailabilityPolicy support for Managed Disks

[aimuhire]

Description

Exposes Azure SDK's existing Disk Availability Policy feature through PowerShell cmdlets, enabling configuration of VM behavior when disks experience I/O degradation.

New Parameter:

• -ActionOnDiskDelay parameter added to New-AzDiskConfig and New-AzDiskUpdateConfig
• Supported values: None, AutomaticReattach

Cmdlets Updated:

• New-AzDiskConfig
• New-AzDiskUpdateConfig

Usage

# Create disk with automatic reattachment on I/O issues
$config = New-AzDiskConfig -Location "EastUS" -DiskSizeGB 5 `
    -SkuName Standard_LRS -CreateOption Empty `
    -ActionOnDiskDelay 'AutomaticReattach'
New-AzDisk -ResourceGroupName "rg" -DiskName "disk" -Disk $config

# Update existing disk policy
$update = New-AzDiskUpdateConfig -ActionOnDiskDelay 'None'
Update-AzDisk -ResourceGroupName "rg" -DiskName "disk" -Disk $update

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

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[aimuhire]

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[Copilot]

Pull request overview

This PR exposes the Disk Availability Policy feature in the Az.Compute module by adding an -ActionOnDiskDelay parameter to disk config/update config cmdlets, wiring it through to the SDK model, and adding scenario coverage.

Changes:

• Added -ActionOnDiskDelay to New-AzDiskConfig and New-AzDiskUpdateConfig and mapped it to AvailabilityPolicy.ActionOnDiskDelay.
• Extended PowerShell disk models to include AvailabilityPolicy so the setting is round-tripped and observable.
• Added a new scenario test for create/get/update flows and updated Compute changelog/help.

Reviewed changes

Copilot reviewed 5 out of 11 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/Compute/Compute/help/New-AzDiskUpdateConfig.md	Documents the new -ActionOnDiskDelay parameter for disk update config.
src/Compute/Compute/help/New-AzDiskConfig.md	Documents the new -ActionOnDiskDelay parameter for disk config.
src/Compute/Compute/Generated/Models/PSDiskUpdate.cs	Adds AvailabilityPolicy to the disk update PS model for mapping/serialization.
src/Compute/Compute/Generated/Models/PSDisk.cs	Adds AvailabilityPolicy to the disk PS model so Get-AzDisk can surface it.
src/Compute/Compute/Generated/Disk/Config/NewAzureRmDiskUpdateConfigCommand.cs	Introduces -ActionOnDiskDelay and sets AvailabilityPolicy on PSDiskUpdate.
src/Compute/Compute/Generated/Disk/Config/NewAzureRmDiskConfigCommand.cs	Introduces -ActionOnDiskDelay and sets AvailabilityPolicy on PSDisk.
src/Compute/Compute/ChangeLog.md	Adds an Upcoming Release note for the new disk availability behavior support.
src/Compute/Compute.Test/ScenarioTests/DiskRPTests.ps1	Adds a new scenario test function covering create/get/update with availability policy.
src/Compute/Compute.Test/ScenarioTests/DiskRPTests.cs	Wires the new PowerShell scenario test into the test runner.
src/Compute/Compute.Management.Sdk/Rest-api-specs/DiskRP.json	Updates AvailabilityPolicy descriptions (grammar).
src/Compute/Compute.Management.Sdk/Generated/Models/AvailabilityPolicy.cs	Updates XML docs (grammar) for ActionOnDiskDelay.

Comments suppressed due to low confidence (1)

src/Compute/Compute/ChangeLog.md:30

• ChangeLog entries should reflect the user-facing PowerShell surface. Here the parameter name is written without the leading dash; please update to -ActionOnDiskDelay for consistency with other entries and cmdlet usage, and keep wording in past tense (for example, avoid 'Users can now …' phrasing if possible).

    - Removed local swagger files and replaced references with remote swagger files.
* Added new cmdlets for Availability Set to Virtual Machine Scale Set (VMSS) Flex migration (Public Preview)
    - `Convert-AzAvailabilitySet`: Converts an Availability Set to a new Flexible Virtual Machine Scale Set without downtime
    - `Test-AzAvailabilitySetMigration`: Validates that VMs in an Availability Set can be migrated to a VMSS

[audreyttt]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[isra-fel]

LGTM besides @audreyttt 's comment

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 10 changed files in this pull request and generated 1 comment.

[Copilot]

The new release note entry was added under the historical "## Version 11.0.0" section. Per this file’s header guidance, new user-facing changes should be placed under "## Upcoming Release" at the top. Also consider formatting the parameter as -ActionOnDiskDelay (with the leading dash) to match how users pass it on the command line.

[aimuhire]

@audreyttt I moved this to Upcoming Release, let me know if it should stay under Version 11.0.0

[audreyttt]

Yes it should go under upcoming release, thanks!

[Copilot]

Pull request overview

Copilot reviewed 5 out of 10 changed files in this pull request and generated 1 comment.

[Copilot]

The new ChangeLog entry is a bit generic ("Added support for Disk Availability Policy") and doesn’t clearly describe the user-visible behavior/impact (what policy is being set and when it applies). Consider rewriting the top-level bullet to explicitly mention managed disks and that -ActionOnDiskDelay configures the disk’s availability behavior when the disk experiences slow I/O, keeping the wording user-focused per the ChangeLog header guidance.

Suggested change

	* Added support for Disk Availability Policy
	- Added `-ActionOnDiskDelay` parameter to `New-AzDiskConfig` cmdlet to configure disk availability behavior
	- Added `-ActionOnDiskDelay` parameter to `New-AzDiskUpdateConfig` cmdlet to update disk availability behavior
	* Added support for configuring managed disk availability behavior when disks experience slow I/O
	- Added `-ActionOnDiskDelay` parameter to `New-AzDiskConfig` cmdlet so users can choose how a managed disk should behave when it experiences slow I/O
	- Added `-ActionOnDiskDelay` parameter to `New-AzDiskUpdateConfig` cmdlet so users can update the slow I/O availability behavior of existing managed disks

[audreyttt]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[audreyttt]

LGTM!