rds: Can't add PostgreSQL read replica with gp3 storage type

[arlampin]

Describe the bug

Trying to add DatabaseInstanceReadReplica with gp3 storage type causes the following error when just maxAllocatedStorage is defined. And there's no option to add allocatedStorage.

You must specify both the storage size and iops when modifying the storage size or iops on a DB instance that has iops

Expected Behavior

It should be possible to add DatabaseInstanceReadReplica with gp3 storage without errors.

Current Behavior

Trying to add DatabaseInstanceReadReplica causes the following error at the end of process

You must specify both the storage size and iops when modifying the storage size or iops on a DB instance that has iops. 

Reproduction Steps

new rds.DatabaseInstanceReadReplica(this, 'DatabaseReadReplica', {
  sourceDatabaseInstance: database,
  vpc: vpc,
  instanceType: ec2.InstanceType.of(
    ec2.InstanceClass.M6G,
    ec2.InstanceSize.LARGE,
  ),
  maxAllocatedStorage: 100,
  storageType: StorageType.GP3
});

Possible Solution

Maybe this is caused by gp3 storage inherently having iops even without any explicit configuration?

Additional Information/Context

No response

CDK CLI Version

2.91.0 (build eea12ea)

Framework Version

No response

Node.js Version

v18.17.0

OS

macOS

Language

Typescript

Language Version

No response

Other information

No response

[arlampin]

Seems that #16934 (comment) can be used to work around the problem

[peterwoodworth]

Thanks for the report, I created this feature request which is the same as this issue I believe 🙂

If you're willing to contribute, check out our contributing guide. This would be a pretty easy one 🙂

[github-actions]

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