Scale requirements for AKS on Azure Local
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Applies to: Azure Local, version 23H2
This article describes the maximum and minimum supported scale count for AKS on Azure Local clusters and node pools.
Support count for AKS on Azure Local
| Scale item |
Minimum |
Maximum |
| Number of physical nodes in an Azure Local cluster |
1 |
16 |
| Count of control plane nodes (Allowed values are 1, 3, and 5) |
1 |
5 |
| Number of nodes in default node pool created during cluster create |
1 |
200 |
| Number of node pools in an AKS cluster |
1 |
16 |
| Number of nodes in a node pool (empty node pools not supported) |
1 |
64 |
| Total number of nodes in an AKS cluster across nodepools |
1 |
200 |
| Number of AKS clusters per Azure Local cluster |
0 |
32 |
Concurrency for AKS enabled by Arc
| Scale item |
Count |
| Number of concurrent AKS cluster creations on an ARB |
8 |
| Number of concurrent node pool creations on an ARB |
8 |
| Number of concurrent operations across all different AKS clusters such as upgrade/scaling, etc., excluding creating node pool or clusters per ARB |
32 |
| Number of long running operations that can be run simultaneously on an AKS cluster |
1 per cluster. |
Default values for virtual machine sizes
| System Role |
VM Size |
Memory, CPU |
| AKS Arc control plane nodes |
Standard_A4_v2 |
8-GB memory, 4 vcpu |
| AKS Arc Linux worker node |
Standard_A4_v2 |
8-GB memory, 4 vcpu |
| AKS Arc Windows worker node |
Standard_K8S3_v1 |
6-GB memory, 4 vcpu |
Supported values for control plane node sizes
| VM Size |
CPU |
Memory (GB) |
| Standard_A4_v2 |
4 |
8 |
| Standard_D4s_v3 |
4 |
16 |
| Standard_D8s_v3 |
8 |
32 |
| Standard_K8S3_v1 |
4 |
6 |
Supported values for worker node sizes
| VM Size |
CPU |
Memory (GB) |
| Standard_A4_v2 |
4 |
8 |
| Standard_A2_v2 |
2 |
4 |
| Standard_D4s_v3 |
4 |
16 |
| Standard_D8s_v3 |
8 |
32 |
| Standard_K8S3_v1 |
4 |
6 |
For more worker node sizes with GPU support, see the next section.
Supported GPU models
The following GPU models are supported by AKS on Azure Local, version 23H2:
| Manufacturer |
GPU model |
Supported version |
| NVidia |
A2 |
2311.2 |
| NVidia |
A16 |
2402.0 |
| NVidia |
T4 |
2408.0 |
Supported VM sizes
The following VM sizes for each GPU models are supported by AKS on Azure Local, version 23H2.
Nvidia T4 is supported by NK T4 SKUs
| VM size |
GPUs |
GPU Memory: GiB |
vCPU |
Memory: GiB |
| Standard_NK6 |
1 |
8 |
6 |
12 |
| Standard_NK12 |
2 |
16 |
12 |
24 |
Nvidia A2 is supported by NC2 A2 SKUs
| VM size |
GPUs |
GPU Memory: GiB |
vCPU |
Memory: GiB |
| Standard_NC4_A2 |
1 |
16 |
4 |
8 |
| Standard_NC8_A2 |
1 |
16 |
8 |
16 |
| Standard_NC16_A2 |
2 |
48 |
16 |
64 |
| Standard_NC32_A2 |
2 |
48 |
32 |
128 |
Nvidia A16 is supported by NC2 A16 SKUs
| VM size |
GPUs |
GPU Memory: GiB |
vCPU |
Memory: GiB |
| Standard_NC4_A16 |
1 |
16 |
4 |
8 |
| Standard_NC8_A16 |
1 |
16 |
8 |
16 |
| Standard_NC16_A16 |
2 |
48 |
16 |
64 |
| Standard_NC32_A16 |
2 |
48 |
32 |
128 |
Next steps