Change EBS type from gp3 to gp2

[brunoxd13]

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Terraform CLI and Terraform AWS Provider Version

Terraform v0.13.6
provider  hashicorp/aws v3.28.0

Affected Resource(s)

Terraform Configuration Files

resource "aws_ebs_volume" "this" {
  availability_zone = "us-west-2a"
  size = 40
  type = "gp2"
  throughput = null
}

Debug Output

Error: InvalidParameterCombination: The throughput parameter is not supported for gp2 volumes.

Expected Behavior

When changing the EBS disk type from gp3 to gp2, an error related to throughput should not be reported, as it does not "exist" for the gp2 disk type.

The validation on code base is this one

I have seen the code base and on this line its maintained the throughput var, but for gp2 it should not maintain.

Actual Behavior

When I change the disk from gp3 to gp2 the change is not allowed because the disk has no throughput configuration, I cannot even pass as null or 0.

I cannot pass this variable because of the error saying that the type gp3 has saved in the state.

Steps to Reproduce

1. Create an ebs disc with the gp3 type;
2. Change the disc type from gp3 to gp2;

[ewbankkit]

Related:

• EBS gp3 volume scalable throughput #16514

[ewbankkit]

I can reproduce with a new acceptance test case:

$ make testacc TEST=./aws/ TESTARGS='-run=TestAccAWSEBSVolume_gp3_to_gp2'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSEBSVolume_gp3_to_gp2 -timeout 120m
=== RUN   TestAccAWSEBSVolume_gp3_to_gp2
=== PAUSE TestAccAWSEBSVolume_gp3_to_gp2
=== CONT  TestAccAWSEBSVolume_gp3_to_gp2
    resource_aws_ebs_volume_test.go:603: Step 3/3 error: Error running apply: exit status 1
        2021/02/16 17:50:00 [DEBUG] Using modified User-Agent: Terraform/0.12.26 HashiCorp-terraform-exec/0.13.0
        
        Error: InvalidParameterCombination: The throughput parameter is not supported for gp2 volumes.
        	status code: 400, request id: f42faf20-398b-4948-9706-dbbbffa5d155
        
        
--- FAIL: TestAccAWSEBSVolume_gp3_to_gp2 (31.83s)
FAIL
FAIL	github.com/terraform-providers/terraform-provider-aws/aws	31.926s
FAIL
GNUmakefile:27: recipe for target 'testacc' failed
make: *** [testacc] Error 1

[ghost]

This has been released in version 3.29.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!