Virtual machine vCPU quotas
The vCPU quotas for virtual machines and virtual machine scale sets are arranged in two tiers for each subscription, in each region. The first tier is the Total Regional vCPUs, and the second tier is the various VM size family cores such as the D-series vCPUs. Any time a new VM is deployed the vCPUs for the VM must not exceed the vCPU quota for the VM size family or the total regional vCPU quota. If either of those quotas are exceeded, the VM deployment will not be allowed. There is also a quota for the overall number of virtual machines in the region. The details on each of these quotas can be seen in the Usage + quotas section of the Subscription page in the Azure portal, or you can query for the values using the Azure CLI.
You can check your quota usage using az vm list-usage.
az vm list-usage --location "East US" -o table
The output should look something like this:
Name CurrentValue Limit -------------------------------- -------------- ------- Availability Sets 0 2000 Total Regional vCPUs 29 100 Virtual Machines 7 10000 Virtual Machine Scale Sets 0 2000 Standard DSv3 Family vCPUs 8 100 Standard DSv2 Family vCPUs 3 100 Standard Dv3 Family vCPUs 2 100 Standard D Family vCPUs 8 100 Standard Dv2 Family vCPUs 8 100 Basic A Family vCPUs 0 100 Standard A0-A7 Family vCPUs 0 100 Standard A8-A11 Family vCPUs 0 100 Standard DS Family vCPUs 0 100 Standard G Family vCPUs 0 100 Standard GS Family vCPUs 0 100 Standard F Family vCPUs 0 100 Standard FS Family vCPUs 0 100 Standard Storage Managed Disks 5 10000 Premium Storage Managed Disks 5 10000
Reserved VM Instances
Reserved VM Instances, which are scoped to a single subscription without VM size flexibility, will add a new aspect to the vCPU quotas. These values describe the number of instances of the stated size that must be deployable in the subscription. They work as a placeholder in the quota system to ensure that quota is reserved to ensure Azure reservations are deployable in the subscription. For example, if a specific subscription has 10 Standard_D1 reservations the usages limit for Standard_D1 reservations will be 10. This will cause Azure to ensure that there are always at least 10 vCPUs available in the Total Regional vCPUs quota to be used for Standard_D1 instances and there are at least 10 vCPUs available in the Standard D Family vCPU quota to be used for Standard_D1 instances.
If a quota increase is required to either purchase a Single Subscription RI, you can request a quota increase on your subscription.
For more information about billing and quotas, see Azure subscription and service limits, quotas, and constraints.