| 摘要 |
This storage device has a plurality of final storage media and a cache device provided with a data compression function and a parity generation function. The storage device stores write data from a host device in the final storage medium after compressing the data, and, for the host device, provides a virtual non-compressed volume for concealing that the data is stored after being compressed. The storage device divides the area of the virtual non-compressed volume into stripe units, and manages each stripe in correlation with one of the plurality of final storage media constituting a RAID group. When storing the data of each stripe in the final storage medium, the storage device generates a parity from the data of each stripe and compresses the generated parity and the data of each stripe by using the cache device, and stores the parity and the data of each stripe that have been compressed by the cache device in each of the final storage media constituting the RAID group. |
