In Huawei Oceanstor 9000, the client that processes the write request will slice the data according to the protection level specified by the file, write the data slices to the power-saving memory on the corresponding node, and then calculate the calibration by each node. Check the data sheet and write it into the power-saving memory of each 2 nodes. After all nodes are successfully written into the power- saving memory, the write operation is successful.