Failed to start vm error

Question

Failed to start vm error

Bharathkumar 0

Error: Failed to start VM error: "Allocation Failed. We do not have sufficient capacity for the requested VM size in this zone"

Vm Size: Standard B2ms

Region: Central India (Zone 1)

Deepanshu katara 18,150 Reputation points MVP Volunteer Moderator

2025-11-13T07:58:54.98+00:00
Hello , Welcome to MS Q&A

This is an Azure VM allocation failure caused by insufficient capacity for the selected size (Standard B2ms) in the specified zone (Central India Zone 1).

Solutions:

Restart in a Different Zone or Region Move the VM to another availability zone within the same region or a different region where capacity is available Or redeploy the VM in a different region.
az vm move --resource-group <RG_NAME> --name <VM_NAME> --destination-zone <ZONE_NUMBER>

Change VM Size > Standard_B2s, Standard_B2ms, Standard_B4ms, Go to VM → Size → Resize and pick a size with available capacity

Pls check if this help and let me know

Thanks
Manish Deshpande 7,010 Reputation points Microsoft External Staff Moderator

2025-11-17T02:49:12.94+00:00

Hello Bharathkumar

I just wanted to kindly follow up to check if you had a chance to review my earlier response. I hope the information shared was helpful. Please feel free to reach out if you have any additional questions or need further clarification.
Manish Deshpande 7,010 Reputation points Microsoft External Staff Moderator

2025-11-18T05:45:15.3366667+00:00

Hello Bharathkumar

I just wanted to kindly follow up to check if you had a chance to review my earlier response. I hope the information shared was helpful. Please feel free to reach out if you have any additional questions or need further clarification.

1 answer

Your answer

Deepanshu katara 18,150 Reputation points MVP Volunteer Moderator

2025-11-13T07:58:54.98+00:00

Hello , Welcome to MS Q&A

This is an Azure VM allocation failure caused by insufficient capacity for the selected size (Standard B2ms) in the specified zone (Central India Zone 1).

Solutions:

Restart in a Different Zone or Region Move the VM to another availability zone within the same region or a different region where capacity is available Or redeploy the VM in a different region.
az vm move --resource-group <RG_NAME> --name <VM_NAME> --destination-zone <ZONE_NUMBER>

Change VM Size > Standard_B2s, Standard_B2ms, Standard_B4ms, Go to VM → Size → Resize and pick a size with available capacity

Pls check if this help and let me know

Thanks
Manish Deshpande 7,010 Reputation points Microsoft External Staff Moderator

2025-11-17T02:49:12.94+00:00

Hello Bharathkumar

I just wanted to kindly follow up to check if you had a chance to review my earlier response. I hope the information shared was helpful. Please feel free to reach out if you have any additional questions or need further clarification.
Manish Deshpande 7,010 Reputation points Microsoft External Staff Moderator

2025-11-18T05:45:15.3366667+00:00

Hello Bharathkumar

I just wanted to kindly follow up to check if you had a chance to review my earlier response. I hope the information shared was helpful. Please feel free to reach out if you have any additional questions or need further clarification.

Answer 1

Hello Bharathkumar

The error message you're receiving "Failed to start virtual machine ''. Error: Allocation failed. We do not have sufficient capacity for the requested VM size in this zone" means that Azure doesn’t currently have enough free capacity in the specific zone and region you’re trying to deploy in, for that particular VM size.

This issue is not related to your configuration, but rather a capacity shortage in the underlying Azure infrastructure. This can happen, especially with large or specialized VM sizes, or during peak times.

Check Current Quotas and Usage

az vm list-usage --location "Canada Central" --output table

az vm list-usage --location "Canada East" --output table

Retrieve Quota Details via REST API

  az rest --method get --url "https://management.azure.com/subscriptions/<your-subscription-id>/providers/Microsoft.Compute/locations/canadacentral/usages?api-version=2023-07-01"

Request Quota Increase via CLI

    az support create --problem-class "Quota" --service-id "compute" --title "Increase VM quota in Canada regions" --description "Unable to deploy VMs due to insufficient quota and portal quota blade not loading"

Please follow these steps:

If you’re using availability zones, try selecting another zone within the same region. It’s possible that a different zone has available capacity for the VM size you need.
Resize a VM or add a VM to an existing availability set must be tried at the original cluster that hosts the existing availability set. The requested VM size is supported by the cluster, but the cluster may not currently have sufficient capacity.
If the VM can be part of a different availability set, create a VM in a different availability set (in the same region). This new VM can then be added to the same virtual network.

Stop (deallocate) all VMs in the same availability set, then start all applicable VMs in batch. To stop: Click Resource groups > Resources > Virtual Machines > Stop. After all, VMs stop, navigate to Home > Virtual machines, add an Availability set filter and then select Group by availability set. Select all applicable VMs and click Start.

This step makes sure that a new allocation attempt is run and that a new cluster can be selected that has sufficient capacity.

For detailed information, please check: https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/allocation-failure

Thanks,
Manish Deshpande

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