A computer system, comprising: a server; and a storage system, the server including an operating system, the storage system including a storage control part, wherein the operating system is configured to: transmit a read request for first data to the storage system in a case of receiving the read request for the first data not stored in a server cache from an application; store the first data received from the storage system into the server cache, and wherein the storage control part is configured to: read the first data from the storage cache, transmit the read first data to the server, and invalidate the first data stored in the storage cache.