Storage device write request processing method and related device

The invention discloses a storage device write request processing method which comprises: when a write request is issued, enabling a storage device to obtain the IO size of the write request; when theIO size is smaller than a lower limit threshold value, writing data corresponding to the write request into a first storage medium; when the IO size is greater than an upper limit threshold value, writing data corresponding to the write request into a second storage medium; and when the IO size is between the lower limit threshold value and the upper limit threshold value, determining a target storage medium according to the object type of the write request, and writing data corresponding to the write request into the target storage medium. Through the processing mode of setting the intermediate level IO, the service life reduction caused by only operating one storage medium is avoided, and the performance utilization rate of the storage device is improved. The invention further disclosesa storage device, a stora