Request a core limit increase

This article describes how you can submit a support request to increase the number of cores for Azure Lab Services in your Azure subscription. First, collect the necessary information for the request.

When you reach the cores limit for your subscription, you can request a core limit increase to continue using Azure Lab Services. An increase is sometimes called an increase in capacity or a quota increase. The request process allows the Azure Lab Services team to ensure that your subscription isn't involved in any cases of fraud or unintentional, sudden large-scale deployments.


  • To create a support request, your Azure account needs the Owner, Contributor, or Support Request Contributor role at the subscription level.

  • To verify current quota for a subscription before you submit a support request, your Azure account needs the Owner or Contributor role at the subscription level.

Prepare to submit a request

Before you create a support request for a core limit increase, gather necessary information, such as the number and size of cores and the Azure regions. You might also have to do some preparation before you create the request.

Create a lab plan

To create a request for Azure Lab Services capacity, you need to have a lab plan. If you don't already have a lab plan, follow these steps to create a lab plan.

Verify available capacity

Before you calculate the number of extra cores that you need, verify the capacity available in your subscription by determining the current usage and quota. You can see exactly where your current capacity is used. You might discover extra capacity in an unused lab plan or lab.

Determine the regions for your labs

Azure Lab Services resources can exist in different regions. You can choose to deploy resources in multiple regions close to the lab users. For more information about Azure regions, how they relate to global geographies, and which services are available in each region, see Azure global infrastructure.

Determine the number of VM cores in your request

In your support request, provide the total number of cores. This total includes both your existing cores and the cores you want to add.

Azure Lab Services groups VM sizes together in size groups:

  • Small / Medium / Large cores
  • Medium (Nested Virtualization) / Large (Nested Virtualization) cores
  • Small (GPU Compute) cores
  • Small GPU (Visualization) cores
  • Medium GPU (Visualization) cores

You request VM cores for a specific Azure region. When you select the region in the support request, you can view your current usage and current limit per size group.

To determine the total number of cores for your request, use this equation: total VM cores = (current # cores for the size group) + ((# cores for the selected VM size) * (# VMs))

For example, you need more capacity for 20 Medium VMs. You already have the following VMs:

VM size Cores per VM # VMs Total cores
Small 2 10 20
Medium 4 20 80
Small GPU 6 5 30

The current number of cores for the Small/Medium/Large size group is 20 (Small) + 80 (Medium) = 100 cores. You don't count the Small GPU cores because they're in a different size group.

The total number of VM cores for 20 more Medium VMs is 100 + (4 cores per Medium VM) * 20 = 180 cores.

Best practices for requesting a core limit increase

The time it takes to assign capacity varies depending on the VM size, region, and number of cores requested. You don't need to go through the process of requesting extra capacity often. To ensure that you have the resources you require when you need them, you should:

  • Request capacity as far in advance as possible.
  • Be flexible on the region where you're requesting capacity, if possible.
  • Recognize that capacity remains assigned for the lifetime of a subscription. When lab plans or labs are deleted, the capacity remains assigned to the subscription.
  • Request extra capacity only if you need more than is already assigned to your subscription.
  • Make incremental requests for VM cores rather than making large, bulk requests. Break requests for large numbers of cores into smaller requests for extra flexibility in how those requests are fulfilled.

Start a new support request

You can follow these steps to request a core limit increase:

  1. In the Azure portal, navigate to your lab plan or lab account, and then select Request core limit increase.

    Screenshot of the Lab plan overview page in the Azure portal, highlighting the Request core limit increase button.

  2. On the New support request page, enter the following information, and then select Next.

    Name Value
    Issue type Service and subscription limits (quotas)
    Subscription Select the subscription to which the request applies.
    Quota type Azure Lab Services
  3. On the Additional details tab, select Enter details in the Problem details section.

    Screenshot of the Additional details page with Enter details highlighted.

Make core limit increase request

When you request a core limit increase, supply information to help the Azure Lab Services team evaluate and act on your request as quickly as possible. The more information you supply and the earlier you supply it, the quicker the Azure Lab Services team can process your request.

Depending on whether you use lab accounts or lab plans, you need to provide different information on the Quota details page.

Screenshot of the Quota details page for Lab Services v2.

Name Value
Deployment Model Lab Plan
Region Select the region in the Azure geography where you want the extra cores.
Does your virtual network reside in the same region as above? Select Yes, No, or N/A, depending on whether you use advanced networking and have virtual networks in the region you selected.
Virtual machine size Select the virtual machine size that you require for the new cores.
Requested total core limit Enter the total number of cores you require. This number includes your existing cores and the number of extra cores you're requesting. To learn how to calculate the total number of cores, see Determine the total number of cores in your request.

After you enter the required information and details, select Save and continue.

Complete the support request

To complete the support request, enter the following information:

  1. Complete the remainder of the support request Additional details tab:

    Advanced diagnostic information

    Name Value
    Allow collection of advanced diagnostic information Select yes or no.

    Support method

    Name Value
    Support plan Select your support plan.
    Severity Select the severity of the issue.
    Preferred contact method Select email or phone.
    Your availability Enter your availability.
    Support language Select your language preference.

    Contact information

    Name Value
    First name Enter your first name.
    Last name Enter your last name.
    Email Enter your contact email.
    Additional email for notification Enter an email for notifications.
    Phone Enter your contact phone number.
    Country/region Enter your location.
    Save contact changes for future support requests. Select the check box to save changes.
  2. Select Next.

  3. On the Review + create tab, review the information, and then select Create.