Embodiments of the present disclosure provide methods and apparatuses for controlling data reading from a storage system. The storage system includes a plurality of storage devices and a backup of the data is stored in each of the plurality of storage devices. A method comprises: receiving a read request for reading data from the storage system; determining, from the plurality of storage devices, a target storage device for processing the read request according to the number of outstanding read requests and the number of completed read requests recorded for each storage device; and sending the read request to the target storage device. The methods or apparatuses according to the embodiments of the present disclosure can reduce I/O response time and improve I/O performance.