Storage controller, method, and storage system

A method performed by a computer having a processor, the method comprising:

• receiving a first write request of data;
• determining a first time when the first write request is received;
• specifying, based on the first time, a first storage device included in a plurality of storage devices;
• writing the data into the first storage device;
• receiving a read request for the data by the computer;
• determining a second time when the read request is received;
• specifying a second storage device included in the plurality of storage devices, wherein, in anticipation of a second write request received at the second time, the processor is configured to specify the second storage device based on the second time;
• determining whether the first storage device is identical to the second storage device;
• and
• reading the data from the first storage device when the first storage device is not identical to the second storage device, but not reading the data from the first storage device when the first storage device is identical to the second storage device.

A storage system comprising:

• a client device;
• and
• a storage apparatus configured to be coupled to a plurality of storage devices, wherein
• the client device is configured to
• transmit a first write request of data and a read request for the data to the storage apparatus, and
• the storage apparatus is configured to
• receive the first write request for the data,
• determine a first time when the first write request is received,
• specify, based on the first time, a first storage device included in the plurality of storage devices,
• write the data into the first storage device,
• receive the read request for the data,
• determine a second time when the read request is received,
• specify a second storage device included in the plurality of storage devices, wherein, in anticipation of a second write request received at the second time, the storage apparatus is configured to specify the second storage device based on the second time,
• determine whether the first storage device is identical to the second storage device, and
• read the data from the first storage device when the first storage device is not identical to the second storage device, while not read the data from the first storage device when the first storage device is identical to the second storage device.