To be ready for future growth, Azure Stack HCI clusters can be easily expanded to provide more performance and capacity to the workloads running in the VMs. The solution offers a minimum cluster size of two AX nodes and a maximum size cluster of 16 AX nodes.
- AX nodes do not support the expansion of a two-node cluster to a larger cluster size. However, these AX nodes can be repurposed and redeployed into a new cluster as necessary.
- When expanding a cluster, all nodes in an Azure Stack HCI cluster must have homogenous hardware configurations.
- A three-node cluster provides fault-tolerance only for a simultaneous failure of a single node and a single drive. If the deployment requires future expansion and optimal fault tolerance, consider starting with a four-node cluster at a minimum.