Abstract: A device for operation of a system having a plurality of storage modules and one or a plurality of computing units. The device ascertains, for a first storage module of the plurality of storage modules, an overall access time of a computing unit of the computing unit(s) to this one data element in this first storage module, as a function of a read access frequency, and ascertains the overall access time, also as a function of the duration of a read access of this computing unit to this first storage module. The device decides, as a function of this ascertained overall access time of this computing unit to this data element in this first storage module, whether the data element is stored in this first storage module or in another of the storage module(s).