# File lib/fog/aws/models/rds/server.rb, line 70
        def save
          requires :engine
          requires :allocated_storage
          requires :master_username
          requires :password
          options = {
            'AllocatedStorage'              => allocated_storage,
            'AutoMinorVersionUpgrade'       => auto_minor_version_upgrade,
            'BackupRetentionPeriod'         => backup_retention_period,
            'DBName'                        => db_name,
            'DBParameterGroupName'          => parameter_group_name,
            'DBSecurityGroups'              => security_group_names,
            'DBInstanceIdentifier'          => id,
            'AvailabilityZone'              => availability_zone,
            'DBInstanceClass'               => flavor_id,
            'Port'                          => port,
            'Engine'                        => engine,
            'EngineVersion'                 => engine_version,
            'MasterUsername'                => master_username,
            'MasterUserPassword'            => password,
            'PreferredMaintenanceWindow'    => preferred_maintenance_window,
            'PreferredBackupWindow'         => preferred_backup_window,
            'MultiAZ'                       => multi_az
          }
          options.delete_if {|key, value| value.nil?}


          data = connection.create_db_instance(id, options)
          merge_attributes(data.body['CreateDBInstanceResult']['DBInstance'])
          true
        end