Patent ID: 6578100
Filing Date: 2003-06-10
Classification: G06F,G11C

Abstract:
A storage system comprising;a plurality of first logical units coupled to at least one host device, said first logical units forming interfaces for the host device; a storage device which stores therein information transferred from the host device; a plurality of second logical units coupled to said storage device, said second logical units forming interfaces for the storage device; a plurality of buses coupled to said plurality of first logical units and said plurality of second logical units, said buses transferring data; at least one cache memory coupled to said plurality of buses, said at least one cache memory temporarily storing therein the data; and a memory, separate from said at least one cache memory, to be referred to by an external processor, said memory storing management information including degraded operation information in a management area, said degraded operation information indicates which of said buses is available for use due to failure in the other of said buses.