Patent ID: 7594071
Filing Date: 2009-09-22
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 comprising a hierarchical directory section and a hash directory section, which operate in parallel with each other; said hierarchical directory section manages data in said cache memory and corresponding to said storage system, using a first portion of said management information groups; and said hash directory section manages data in said cache memory and corresponding to another storage system external to said storage system, using a second portion of said management information groups other than said first portion.