
##### SUMMARY

RDS services can auto-allocate storage. So you can start with the lowest ebs volume and don't care anymore about growing data in der database.  
The boto3 parameter to activate this feature is `MaxAllocatedStorage` (integer) 

>  The upper limit to which Amazon RDS can automatically scale the storage of the DB instance.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
rds_instance


method_name = None
    if state == 'absent' or state == 'terminated':
        if instance and instance['DBInstanceStatus'] not in ['deleting', 'deleted']:
            method_name = 'delete_db_instance'
    else:
        if instance:
            method_name = 'modify_db_instance'
        elif read_replica is True:
            method_name = 'create_db_instance_read_replica'
        elif creation_source == 'snapshot':
            method_name = 'restore_db_instance_from_db_snapshot'
        elif creation_source == 's3':
            method_name = 'restore_db_instance_from_s3'
        elif creation_source == 'instance':
            method_name = 'restore_db_instance_to_point_in_time'
        else:
            method_name = 'create_db_instance'
    return method_name
def get_instance(client, module, db_instance_id):