Patent ID: 7167950
Filing Date: 2007-01-23
Classification: G06F

Abstract:
1. A storage system comprising: a plurality of channel adapters for respectively controlling transmission and reception of data to and from a host device; a plurality of storage device groups for respectively providing logical storage regions; a plurality of disk adapters for respectively controlling transmission and reception of data to and from each of said storage device groups; a cache memory used respectively by each of said channel adapters and each of said disk adapters; a control memory for storing management information groups for managing said cache memory; and a cache managing unit for managing data to be stored in said cache memory by using said management information groups stored in said control memory, wherein said cache managing unit comprises a hierarchical directory section and a hash directory section, which operate in parallel with each other; said hierarchical directory section manages a first prescribed range of data to be stored in said cache memory, using a portion of the management information groups; and said hash directory section manages a second prescribed range of data, different from the data of said first prescribed range, to be stored in said cache memory, using the management information groups other than said portion.