Patent ID: 8832380

Claim:
A storage system, comprising: a controller managing a 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 the plurality of the first type disk drives being different from a second performance characteristic of the plurality of second type disk drives, wherein the controller is configured to set a partition size of the first partition of the cache memory and a partition size of the second partition of the cache memory to values in accordance with differences between the first performance characteristic and the second performance characteristic to enable performance tuning of the cache memory.