| title | description | ms.topic | ms.date |
|---|---|---|---|
Capacity limits in Azure Lab Services |
Learn about VM capacity limits in Azure Lab Services. |
conceptual |
02/01/2022 |
Azure Lab Services has default capacity limits on Azure subscriptions that adhere to Azure Compute quota limitations and to mitigate fraud. All Azure subscriptions will have an initial capacity limit, which can vary based on subscription type, number of standard compute cores, and GPU cores available inside Azure Lab Services. It restricts how many virtual machines you can create inside your lab before you need to request for a limit increase.
If you’re close to or have reached your subscription’s core limit, you’ll see messages from Azure Lab Services. Actions that are affected by core limits include:
- Create a lab
- Publish a lab
- Increase lab capacity
These actions may be disabled if there no more cores that can be enabled for your subscription.
:::image type="content" source="./media/capacity-limits/warning-message.png" alt-text="Screenshot of core limit warning in Azure Lab Services.":::
If you reach the cores limit, you can request a limit increase to continue using Azure Lab Services. The request process is a checkpoint to ensure your subscription isn’t involved in any cases of fraud or unintentional, sudden large-scale deployments.
To create a support request, you must be an Owner, Contributor, or be assigned to the Support Request Contributor role at the subscription level. For information about creating support requests in general, see how to create a How to create an Azure support request.
The admin can follow these steps to request a limit increase:
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Open your lab plan or lab account.
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On the Overview page of the lab plan, select the Request core limit increase button from the menu bar at the top.
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On the Basics page of New support request wizard, enter a short summary that will help you remember the support request in the Summary textbox. The issue type, subscription, and quota type information are automatically filled out for you. Select Next: Solutions.
:::image type="content" source="./media/capacity-limits/new-support-request.png" alt-text="Screenshot of new support request to request more core capacity.":::
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The New support request wizard will automatically advance from the Solutions page to the Details page.
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One the Details page, enter the following information in the Description page.
- VM size. For size details, see VM sizing.
- Number of VMs.
- Location. Location will be a geography or region, if using the April 2022 Update (preview).
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Under Advanced diagnostic information, select No.
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Under Support method section, select your preferred contact method. Verify contact information is correct.
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Select Next: Review + create
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On the Review + create page, select Create to submit the support request.
Once you submit the support request, we’ll review the request. If necessary, we’ll contact you to get more details.
Some rare subscription types that are more commonly used for fraud can have a default limit of zero standard cores and zero GPU cores. If you’re using one of these subscription types, your admin needs to request a limit increase before you can use Azure Lab Services.
Azure Lab Services hosts lab resources, including VMs, within special Microsoft-managed Azure subscriptions that aren’t visible to customers. With the April 2022 Update (preview), VM capacity is dedicated to each customer. Previous to this update, VM capacity was available from a large pool shared by customers.
Before you set up a large number of VMs across your labs, we recommend that you open a support ticket to pre-request VM capacity. Requests should include VM size, number, and location. Requesting capacity before lab creation helps us to ensure that you create your labs in a region that has a sufficient number of VM cores for the VM size that you need for your labs.
See the following articles: