Instance quotas are allocated based on zones, instance types, billing methods, and network types. This topic describes the different types of instance quotas and how to view and increase instance quotas.

Background information

Instance quotas are classified into total quotas, reserved quotas, and base quotas based on the extent to which the provision of resources is guaranteed. Total quotas specify the maximum amounts of guaranteed available instance resources, whereas base quotas specify the minimum amounts of guaranteed available instance resources. The system periodically adjusts your instance quotas based on your instance usage to ensure that growing demands can be met. If a total quota is insufficient for your demands, you can apply to increase it.
Note Reserved quotas specify the amounts of instance resources reserved by elasticity assurances or immediate capacity reservations. For more information, see Overview.
Both the total and usage amounts of the total and base quotas are updated on a rolling basis in a 15-day cycle. The system dynamically adjusts your instance quotas based on your instance usage. You do not need to worry about applying for additional quotas in the case of insufficient quotas due to a large number of instances within your account. Examples:
  • When you query the total quota on August 16, the total amount displayed is the total quota that is dynamically adjusted based on the usage of the quota from August 2 to August 16, and the displayed usage amount is the number of instances created and running from August 2 to August 16.
  • If the base quota remains constant and you have not applied to increase the total quota, the total quota remains unchanged when you query it on August 17. The displayed usage amount is the number of instances created and running from August 3 to August 17.
Note In some cases, it may take up to 24 hours to refresh and display usage data. However, you can continue to create instances.

In addition, instance quotas can be classified into instance type-specific quotas and zone-specific vCPU-based total quotas for all instance types. You do not need to change the zone-specific vCPU-based total quota for all instance types. This value is always greater than the number of vCPUs that you require.

Step 1: View instance quotas

  1. Log on to the ECS console.
  2. In the upper-right corner of the Overview page, click Privileges.
    quota
  3. In the top navigation bar, select a region.
  4. Click the Instance Quota tab.
  5. View instance quota values.
    The following figure shows the Instance Quota tab. Instance quota
    The following table describes the columns in the list shown in the preceding figure.
    Column Description
    • Region/Zone
    • Instance Type
    • Billing Method
    • Network Type
    You can filter and view instance quotas by region, zone, instance type, billing method, and network type. Instance quotas are classified into the following types:
    • Instance type-specific quota: You can select Instance Type from the drop-down list in the upper-left corner to view instance type-specific quotas for different zones, billing methods, and network types
      Note Quotas for instances of the classic network type are displayed only when the classic network is available in the region. You can check whether the classic network is available in the region on the Privileges tab.
    • Zone-specific vCPU-based total quota for all instance types: You can select All from the drop-down list in the upper-left corner to view zone-specific vCPU-based total quotas for all instance types for different zones, billing methods, and network types. You can view the maximum number of vCPUs that can be assigned to instances of all instance types. For example, you can view the maximum number of vCPUs that can be assigned to subscription instances of all instance types of the Virtual Private Cloud (VPC) type in Hangzhou Zone H.
    Quota Unit
    • Instance type-specific quota: The displayed value is the number of instances.
    • Zone-specific vCPU-based total quota for all instance types: The displayed value is the number of vCPUs.
    Total Quota Total quotas include base quotas, reserved quotas, and other quotas. Total quotas are automatically adjusted along with base quotas before the tenth day of each month.

    If the number of instances or vCPUs within your account reaches the total quota, you cannot purchase new instances. If you require more Elastic Compute Service (ECS) instances, you can apply to increase the total quota.

    After the total quota is increased to the specified value, the system keeps the total quota from falling below this value when the system adjusts the total quota within at least 30 days.

    Note When you create ECS instances beyond the base quota, the availability of required resources is not guaranteed.
    Reserved Quota Reserved quotas specify the amounts of instance resources reserved by resource reservations. When you create instances within a reserved quota, the requested resources are guaranteed. To increase reserved quotas, you can create the following resource reservations:
    Base Quota Base quotas are adjusted and allocated before the tenth day of each month based on the usage of your ECS resources. You cannot apply to increase the base quotas.
    Note The base quota is preferentially used when you create instances. When you create instances within the base quota, their corresponding resources are guaranteed to be available.
    In the Total Quota, Reserved Quota, and Base Quota columns, you can check the usage of quotas based on the color of the progress bar. Different colors indicate different meanings:
    • Green: The usage is less than 80% of the total.
    • Yellow: The usage is greater than or equal to 80% but less than 100% of the total.
    • Red: The usage is 100% of the total.

Step 2: Increase instance quotas

  1. Apply to increase quotas based on your requirements.
    • To increase a single quota at a time, find the quota and click Increase Quota in the Actions column.
    • To increase multiple quotas at a time, select the quotas and click Calculate Quotas and Request in the lower part of the page
    Note You cannot apply to increase a quota while the previous quota increase request is being processed.
  2. In the Calculate Quotas and Request dialog box, specify the required parameters and click Submit.
    Recommended quotas are displayed on the page. The request is submitted for fast and automatic approval first. If the request is rejected, it can be submitted again for manual approval.
    • Typically, a requested quota that is less than the recommended value can pass automatic approval.
    • A requested quota that is greater than the recommended value may be rejected by automatic approval. If the request is rejected, you can submit it again for manual approval.
    Specify the required parameters based on your operation type.
    • The following table describes the parameters that you must specify when you request to increase a single quota at a time.
      Parameter Description
      Target Quota Enter your expected quota based on the number of instances or vCPUs.
      Reason Enter the reason of your request.
      Notify Adjustment Results If you select Yes, the system notifies you of the adjustment results by email.
    • The following table describes the parameters that you must specify when you request to increase multiple quotas at a time.
      Parameter Description
      Target Quota You can set a total expected quota for your selected quotas. The system allocates a recommended value based on the number of instances for each quota.
      New Quota You can also specify an expected value for each quota based on the number of instances.
      Reason Enter the reason of your request.
      Notify Adjustment Results If you select Yes, the system notifies you of the adjustment results by email.
  3. In the message that appears, confirm the result of the quota increase operation.
  4. Click Quota Increase Requests in the Actions column to view the state of your request.
    • Approved: Your request is approved and cannot be revoked.
    • Forbid: Your request is rejected. You can click Submit Again in the Actions column and select Manual Approval.

FAQ

Is the zone-specific vCPU-based total quota for all instance types useful? Which must I be more concerned about: the instance type-specific quota or the zone-specific vCPU-based total quota for all instance types?

You do not need to change the zone-specific vCPU-based total quota for all instance types. This value is always greater than the number of vCPUs that you require. In some cases, if your vCPU quota within a zone is insufficient, you must increase the zone-specific vCPU-based total quota for all instance types to create more instances. Capped quota in a single zone