How can I enable the use of osDisk.managedDisk.storageAccountType in my Azure subscription ?

Question

I am trying to use spot instances with ephemeral disks to save costs within a VMSS, but when I run this command:

az vmss create \
  --name vmssagentspool \
  --resource-group Lenguage_VirtualAgents \
  --image Ubuntu2204 \
  --vm-sku Standard_E2as_v4 \
  --storage-sku StandardSSD_LRS \
  --authentication-type SSH \
  --generate-ssh-keys \
  --instance-count 1 \
  --disable-overprovision \
  --upgrade-policy-mode manual \
  --single-placement-group false \
  --platform-fault-domain-count 1 \
  --load-balancer "" \
  --orchestration-mode Uniform \
  --priority Spot \
  --eviction-policy Delete \
  --max-price 0.02 \
  --ephemeral-os-disk

I get the following error:

{"status":"Failed","error":{"code":"DeploymentFailed","target":"/subscriptions/XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX/resourceGroups/XXXXXXXXX/providers/Microsoft.Resources/deployments/vmss_deploy_XXXXXXXXX","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"BadRequest","message":"'osDisk.managedDisk.storageAccountType' is not enabled for the Subscription. Please register the Subscription for 'Microsoft.Compute/AdditionalStorageTypesForEphemeralOSDiskPreview' to use the feature."}]}}

I don't understand how I can register my subscription to use the ephemeral disks feature.

Answer

Thanks for posting your question in the Microsoft Q&A forum.

To enable the use of osDisk.managedDisk.storageAccountType with ephemeral disks in Azure, you need to register your subscription for the feature. Here’s how you can do it:

Use the Azure CLI to register your subscription for the preview feature. Run the following command:

  az feature register --namespace Microsoft.Compute --name AdditionalStorageTypesForEphemeralOSDiskPreview

After registering, you can check the registration status using:

  az feature show --namespace Microsoft.Compute --name AdditionalStorageTypesForEphemeralOSDiskPreview

If needed, you might have to refresh the registration provider:
```
  az provider register --namespace Microsoft.Compute
  
```

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How can I enable the use of osDisk.managedDisk.storageAccountType in my Azure subscription ?

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