Data processing method, device and system

The invention provides a data processing method, device and system.The method comprises the steps that first input is received, the first input comprises the operation of reading first target data from a first disk array or the operation of writing second target data into a second disk array, the first disk array is a disk array constructed by a plurality of mechanical hard disks, and the second disk array is a disk array constructed by a plurality of solid state disks; in response to the first input, reading the first target data from a corresponding disk array through a preset solid state disk linked list, or writing the second target data into the corresponding disk array; wherein the preset solid state disk linked list is constructed based on the historical read-write times of each data in the preset time period. According to the method, the data read-write efficiency is improved under the condition that the low-cost advantage of the mechanical hard disk and the read-write performance of the solid state d