
##### 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


changed = False
    parameters = {'DBInstanceIdentifier': instance['DBInstanceIdentifier']}
    if state == 'stopped' and instance['DBInstanceStatus'] not in ['stopping', 'stopped']:
        if module.params['db_snapshot_identifier']:
            parameters['DBSnapshotIdentifier'] = module.params['db_snapshot_identifier']
        result, changed = call_method(client, module, 'stop_db_instance', parameters)
    elif state == 'started' and instance['DBInstanceStatus'] not in ['available', 'starting', 'restarting']:
        result, changed = call_method(client, module, 'start_db_instance', parameters)
    return changed
def main():
    arg_spec = dict(
        state=dict(choices=['present', 'absent', 'terminated', 'running', 'started', 'stopped', 'rebooted', 'restarted'], default='present'),
        creation_source=dict(choices=['snapshot', 's3', 'instance']),
        force_update_password=dict(type='bool', default=False),
        purge_cloudwatch_logs_exports=dict(type='bool', default=True),
        purge_tags=dict(type='bool', default=True),
        read_replica=dict(type='bool'),
        wait=dict(type='bool', default=True),
    )
    parameter_options = dict(
        allocated_storage=dict(type='int'),
        allow_major_version_upgrade=dict(type='bool'),
        apply_immediately=dict(type='bool', default=False),
        auto_minor_version_upgrade=dict(type='bool'),
        availability_zone=dict(aliases=['az', 'zone']),
        backup_retention_period=dict(type='int'),
        ca_certificate_identifier=dict(),
        character_set_name=dict(),
        copy_tags_to_snapshot=dict(type='bool'),
        db_cluster_identifier=dict(aliases=['cluster_id']),