Patent ID: 7130971

Claim:
A storage system comprising: a first interface to be coupled to a host computer sending I/O instruction; a second interface to be coupled to a console sending management instruction; a storage controller, coupled to the first interface, the second interface and a plurality of storage devices, that conducts an I/O instruction from the host computer and the management instruction from the console; a data storing area configured with at least one of the plurality of storage devices for storing data write accessible by the I/O instruction from the host computer via the first interface, an attribute of the data storing area being managed by the storage controller based on the management instruction; and a log storing area configured with at least one of the plurality of storage devices for storing log information associated with descriptions of the received management instructions which are target to the data storing area, the log storing area being different from the data storing area; wherein the management instruction is for managing attributes of the data storing area; and wherein the storage controller records the log information of the received management instruction targeted to data storing area in the log storing area and restricts the host computer from write access to the log storing area via the first interface.