Switch to default r7gd instance types

Author: bobbyiliev

README.md

@@ -136,7 +136,7 @@ export AWS_PROFILE=your-profile-name
 | <a name="input_node_group_ami_type"></a> [node\_group\_ami\_type](#input\_node\_group\_ami\_type) | AMI type for the node group | `string` | `"AL2023_ARM_64_STANDARD"` | 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.<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/>  "r8g.2xlarge"<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/>- Enable disk setup when using `r7gd`<br/>- Note: Ensure instance store volumes are available and attached to the nodes for optimal performance with disk-based workloads. | `list(string)` | <pre>[<br/>  "r7gd.2xlarge"<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_operator_namespace"></a> [operator\_namespace](#input\_operator\_namespace) | Namespace for the Materialize operator | `string` | `"materialize"` | no |

variables.tf

@@ -113,11 +113,11 @@ 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)
+- Enable disk setup when using `r7gd`
 - Note: Ensure instance store volumes are available and attached to the nodes for optimal performance with disk-based workloads.
 EOF
   type        = list(string)
-  default     = ["r8g.2xlarge"]
+  default     = ["r7gd.2xlarge"]
 }
 
 variable "node_group_capacity_type" {