A computer-implemented method is provided for ensuring a particular service level provided by multiple devices. The method includes maintaining, by a database, complementation parameters for a set of device groups. Each of the device groups includes at least two devices such that one of the two devices can complement at least one functionality of another one of the at least two devices in a same one of the device groups. The method further includes monitoring, by a processor operatively coupled to the database, the devices in the device groups to detect device malfunctions. The method also includes, responsive to a detection of a malfunctioning device from among the device groups, ensuring, by the processor, the particular service level by changing complementation parameters of a corresponding one of the devices paired with the malfunctioning device.