CLI - Amazon Relational Database Service
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CLI

To view your storage volume configuration from the Amazon CLI, use the describe-db-instances command.

aws rds describe-db-instances --db-instance-identifier my-database

In the output, find the AdditionalStorageVolumes array to view details for the added volumes.

    "AdditionalStorageVolumes": [
        {
            "VolumeName": "rdsdbdata2",
            "StorageVolumeStatus": "Not-in-use",
            "AllocatedStorage": 5000,
            "IOPS": 25000,
            "StorageThroughput": 500,
            "StorageType": "gp3"
        }
    ]