Patent ID: 8874972

Claim:
A storage system comprising: a plurality of storage apparatuses; and a controller that accesses each of the plurality of storage apparatuses through a common transmission path and manages the plurality of storage apparatuses so that data to be recorded in the plurality of storage apparatuses is made redundant in the different storage apparatuses, wherein the controller performs a procedure comprising: detecting an error occurred upon access to an access destination being one of the plurality of storage apparatuses; determining, upon detection of the error, that the storage apparatus of the access destination is not an anomaly-occurring portion causing the error, when data to be accessed has no redundancy; and determining, upon detection of the error, that the common transmission path is an anomaly-occurring portion causing the error, when the data to be accessed has no redundancy and when there is a record of a past error in access to the storage apparatuses other than the storage apparatus of the access destination.