Computer system and method executed by computer system

A method executed by a computer system including a storage control unit and a storage apparatus, wherein

• the storage control unit is configured to provide a virtual volume to a processing execution unit configured to execute an application, manage data input to and output from a real volume via the virtual volume, and implement a cache volume based on a storage area of the storage apparatus, and
• the method comprises:
• receiving, by the storage control unit, a notification of information on an operation mode determined by an operation mode determination unit based on processing executed by the processing execution unit;
• executing, by the storage control unit, when an access request is received via the virtual volume from the processing execution unit, in a case where target data of the access request is not stored in the cache volume, an access to the real volume for the target data;
• and
• controlling, by the storage control unit, the cache volume based on the notified information on the operation mode.