A processor of a distribution device included in a storage system is configured to manage an initial write position and a current write position for each of a plurality of storage apparatuses. The initial write position varies for the storage apparatuses. The processor is configured to receive a write request and give an instruction for writing data to each of the storage apparatuses in accordance with the current write position by distributing the write request to each of the storage apparatuses. The processor is configured to manage offset information indicating a write position relative to a top of a storage device corresponding to the current write position for each of the storage apparatuses. The processor is configured to receive a read request and select, based on the offset information, one of the storage apparatuses so as to send the read request to the selected storage apparatus.