Number of Cluster Nodes | Actual Number of AZs in the Region | Number of AZs for Current Cluster Subnets | Actual Number of AZs for Cluster Nodes | Multi-AZ Adjustment Method |
1 node | 1 AZ | 1 AZ | 1 AZ | N/A |
| 2 AZs | 1 AZ | 1 AZ | Add 1 subnet in a different AZ, and increase the number of nodes to 3. |
| | 2 AZs | 1 AZ | Increase the number of nodes to 3. |
| ≥ 3 AZs | 1 AZ | 1 AZ | Add 2 subnets in different AZs, and increase the number of nodes to 3. |
| | 2 AZs | 1 AZ | Add 1 subnet in a different AZ, and increase the number of nodes to 3. |
| | ≥ 3 AZs | 1 AZ | Increase the number of nodes to 3. |
3 nodes | 1 AZ | 1 AZ | 1 AZ | N/A |
| 2 AZs | 1 AZ | 1 AZ | Add 1 subnet in a different AZ, and increase the number of nodes to 5. |
| | 2 AZs | 1 AZ | Increase the number of nodes to 5. |
| | 2 AZs | 2 AZs | N/A |
| ≥ 3 AZs | 1 AZ | 1 AZ | Add 2 subnets in different AZs, and increase the number of nodes to 5. |
| | 2 AZs | 1 AZ | Add 1 subnet in a different AZ, and increase the number of nodes to 5. |
| | 2 AZs | 2 AZs | Add 1 subnet in a different AZ, and increase the number of nodes to 5. |
| | ≥ 3 AZs | 1 AZ | Increase the number of nodes to 5. |
| | ≥ 3 AZs | 2 AZs | Increase the number of nodes to 5. |
| | ≥ 3 AZs | ≥ 3 AZs | N/A |
5 nodes | 1 AZ | 1 AZ | 1 AZ | N/A |
| 2 AZs | 1 AZ | 1 AZ | Add 1 subnet in a different AZ, decrease the number of nodes to 3, and then increase the number of nodes to 5. |
| | 2 AZs | 1 AZ | Decrease the number of nodes to 3, and then increase the number of nodes to 5. |
| | 2 AZs | 2 AZs | N/A |
| ≥ 3 AZs | 1 AZ | 1 AZ | Add 2 subnets in different AZs, decrease the number of nodes to 3, and then increase the number of nodes to 5. |
| | 2 AZs | 1 AZ | Add 1 subnet in a different AZ, decrease the number of nodes to 3, and then increase the number of nodes to 5. |
| | 2 AZs | 2 AZs | Add 1 subnet in a different AZ, decrease the number of nodes to 3, and then increase the number of nodes to 5. |
| | ≥ 3 AZs | 1 AZ | Decrease the number of nodes to 3, and then increase the number of nodes to 5. |
| | ≥ 3 AZs | 2 AZs | Decrease the number of nodes to 3, and then increase the number of nodes to 5. |
| | ≥ 3 AZs | ≥ 3 AZs | N/A |