Patent ID: 8612716

Claim:
A storage system, comprising: a controller managing the cache memory, the cache memory being logically divided into a first partition and a second partition, the first partition being used for storing data read/written by a first application program from/to a first logical volume, and the second partition being used for storing data read/written by a second application program from/to a second logical volume; and a plurality of disk drives having a plurality of first type disk drives configuring the first logical volume and a plurality of second type disk drives configuring the second logical volume, a first performance characteristic of a first type disk drive of the plurality of the first type disk drives being different from a second performance characteristic of a second type disk drive of the plurality of second type disk drives, wherein the controller is configured to set a partition size of the first partition and a partition size of the second partition to values in accordance with the first performance characteristic of the first type disk drive and the second performance characteristic of the second type disk drive so as to avoid a resource conflict between the first application program and the second application program caused by a difference between the first performance characteristic of the first type disk drive and the second performance characteristic of the second type disk drive.