Storage control apparatus, storage system and method of controlling a cache memory

A storage system comprising:

• a storage device;
• and
• a storage control apparatus including a cache memory and a processor coupled to the cache memory, wherein
• the processor is configured to:
• execute a command processing including an access to the storage device and an access to a first area of the cache memory when a command is received from an information processing device,
• generate a first processing report that identifies the first area,
• input the first processing report to a processing report queue when a plurality of second processing reports each of which identifies the first area are not stored in the processing report queue,
• execute management list update processing in which the access to the first area is recorded in a management list in accordance with the first processing report input to the processing report queue,
• identify data to be deleted from the cache memory in accordance with the management list for which the management list update processing is executed, and
• execute at least one of a first processing in which the generated first processing report is not input to the processing report queue and a second processing in which at least one of the plurality of second processing reports are deleted from the processing report queue when the plurality of second processing reports are stored in the processing report queue.

A method of controlling a cache memory included in a storage control apparatus, the method comprising:

• receiving a command from an information processing device;
• in accordance with the received command, executing a command processing including an access to a storage device and an access to a first area of the cache memory;
• generating a first processing report that identifies the first area;
• inputting the first processing report to a processing report queue when a plurality of second processing reports each of which identifies the first area are not stored in the processing report queue;
• executing management list update processing in which the access to the first area is recorded in a management list in accordance with the first processing report input to the processing report queue;
• identifying data to be deleted from the cache memory in accordance with the management list for which the management list update processing is executed;
• and
• executing at least one of a first processing in which the generated first processing report is not input to the processing report queue and a second processing in which at least one of the plurality of second processing reports are deleted from the processing report queue when the plurality of second processing reports are stored in the processing report queue.