Patent ID: 8032490

Claim:
A storage system, the storage system comprising: a storage apparatus; a management computer; and a remote management computer; wherein the storage apparatus, management computer, and remote management computer are connected via a network; wherein the storage apparatus includes: a storage device for storing operation logs concerning the operations of logical units (LUs) in association with a time, wherein the operation logs include: information related to one or more data migration operations, wherein the information includes, for each of the one or more data migration operations, a name of a data migration source LU and a name of a data migration destination LU; information related to one or more external LU creation operations, wherein the one or more external LU creation operations relate to creation of an external LU in another storage apparatus and use of the created external LU as a corresponding virtual LU in the storage apparatus, and wherein the information includes, for each of the one or more external LU creation operations, a name of the created external LU and a name of the corresponding virtual LU; and information related to one or more pairing operations, wherein the information includes, for each of the one or more pairing operations, a name of a primary LU and a name of a secondary LU; and wherein the management computer: collects the operation logs stored in the storage device for the storage apparatus; stores the collected operation logs in the storage area; in response to a logical unit (LU) status history search request from the remote management computer, wherein the LU status history search request indicates an audit period and audit target LUs, restores a log status history for the audit target LUs based on the operation logs stored in the storage area, sets, as an audit range, data in the restored operation log status history that corresponds to the audit period and the audit target LUs, and sends information related to the restored log status history to the remote management computer; wherein the remote management computer, in response to the information related to the restored log status history, displays chronological status history information for the audit target LUs on an LU status history search screen, wherein the chronological status history information indicates whether the audit target LUs are ordinary LUs, data migration source LUs, data migration destination LUs, external LUs, or virtual LUs; and wherein the management computer, in response to a log transmission request from the remote management computer that indicates a designated audit target LU from among the audit target LUs identified on the LU status history search screen, transmits the operation logs for the designated audit target LU to the remote management computer.