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|1. (WO2018051505) STORAGE SYSTEM|
A controller receives a write request from a host and transmits, to a first storage device among a plurality of storage devices, an intermediate parity generation command corresponding to a designated address indicated by the write request. The intermediate parity generation command indicates that intermediate parity is to be generated from new data for the designated address and prior data which will be updated to the new data. The intermediate parity generation command includes a first address in a memory region in which new data is stored and a second address in a memory region for storing intermediate parity. The first storage device receives the intermediate parity generation command, acquires new data from the first address, generates intermediate parity from the new data and the prior data stored in the first storage device, and stores the intermediate parity at the second address.