Patent ID: 7240156

Claim:
A storage system comprising: a display device displaying information; and a disk array system coupled to said display device, comprising: a plurality of channel adapters, coupled to at least one host computer, which communicate data with said host computer, a plurality of disk devices relating to at least one logical volume and storing data sent from said channel adapters, a plurality of disk adapters coupled to said disk devices and causing data sent from said channel adapters to be stored in said disk drives, a cache memory storing data between said channel adapters and said disk adapters and having a plurality of logical partition regions which partition said cache memory logically, and a control memory storing management information which relates to said logical partition regions, wherein said management information includes a plurality of first management information and second management information, each of said first management information is used to independently manage one of said logical partition regions, and said second management information is used to commonly manage said logical partition regions, wherein one of said first management information is set/changed, if one of said logical partition regions is set/changed based on a request sent from said display device, wherein said management information includes a plurality of queues and at least one counter associated with the at least one queue, and wherein at least one of said queues includes partition management information and a counter associated with the at least one of said queues indicates a next entry of the at least one of said queues to be used.