Storage apparatus and method for storage apparatus

A method being executed by a control module included in a storage apparatus connected to a storage device, the method comprising:

• receiving, by the control module, a write request including data to be stored in the storage apparatus from an external device;
• storing, by the control module, the data included in the write request to a storage module included in the storage apparatus;
• storing, by the control module, the data included in the write request to one of a plurality of areas of a memory, the memory included in the storage apparatus, the memory having the plurality of areas storing the data to be copied to the storage device;
• copying, by the control module, the data stored in the one of the plurality of areas to the storage device when the number of areas which the copying is executed is less than a threshold value;
• saving, by the control module, the data stored in the one of the plurality of areas to a saving buffer when the number of areas which the copying is executed is not less than the threshold value, the saving buffer for temporarily saving the data stored in the plurality of areas;
• writing, by the control module, the saved data stored in the saving buffer to the one of the plurality of areas when the number of areas which the copying is executed is less than the threshold value;
• and
• determining, by the control module, the threshold value in accordance with an amount of the write request.