Add clarification for instance types

README.md

@@ -72,7 +72,7 @@ The module has been tested with:
 | <a name="input_namespace"></a> [namespace](#input\_namespace) | Namespace for Materialize resources | `string` | `"materialize-environment"` | no |
 | <a name="input_node_group_capacity_type"></a> [node\_group\_capacity\_type](#input\_node\_group\_capacity\_type) | Capacity type for worker nodes (ON\_DEMAND or SPOT) | `string` | `"ON_DEMAND"` | no |
 | <a name="input_node_group_desired_size"></a> [node\_group\_desired\_size](#input\_node\_group\_desired\_size) | Desired number of worker nodes | `number` | `2` | no |
-| <a name="input_node_group_instance_types"></a> [node\_group\_instance\_types](#input\_node\_group\_instance\_types) | Instance types for worker nodes | `list(string)` | <pre>[<br/>  "t3.large"<br/>]</pre> | no |
+| <a name="input_node_group_instance_types"></a> [node\_group\_instance\_types](#input\_node\_group\_instance\_types) | Instance types for worker nodes.<br/><br/>Recommended Configuration for Running Materialize with disk:<br/>- Tested instance types: `m6g`, `m7g` families (ARM-based Graviton instances)<br/>- AMI: AWS Bottlerocket (optimized for container workloads)<br/>- Note: Ensure instance store volumes are available and attached to the nodes for optimal performance with disk-based workloads. | `list(string)` | <pre>[<br/>  "m6g.medium"<br/>]</pre> | no |
 | <a name="input_node_group_max_size"></a> [node\_group\_max\_size](#input\_node\_group\_max\_size) | Maximum number of worker nodes | `number` | `4` | no |
 | <a name="input_node_group_min_size"></a> [node\_group\_min\_size](#input\_node\_group\_min\_size) | Minimum number of worker nodes | `number` | `1` | no |
 | <a name="input_postgres_version"></a> [postgres\_version](#input\_postgres\_version) | Version of PostgreSQL to use | `string` | `"15"` | no |

variables.tf

@@ -84,9 +84,16 @@ variable "node_group_max_size" {
 }
 
 variable "node_group_instance_types" {
-  description = "Instance types for worker nodes"
+  description = <<EOF
+Instance types for worker nodes.
+
+Recommended Configuration for Running Materialize with disk:
+- Tested instance types: `m6g`, `m7g` families (ARM-based Graviton instances)
+- AMI: AWS Bottlerocket (optimized for container workloads)
+- Note: Ensure instance store volumes are available and attached to the nodes for optimal performance with disk-based workloads.
+EOF
   type        = list(string)
-  default     = ["t3.large"]
+  default     = ["m6g.medium"]
 }
 
 variable "node_group_capacity_type" {