Patent ID: 7555618

Claim:
A method for assuring genuineness of data maintained on a storage system having a storage controller and a plurality of storage devices, the method comprising: storing, in a memory of the storage controller, retention information associated with a data storing area configured with at least one of the plurality of storage devices; conducting I/O operations to the data storing area based on I/O instructions received from a host computer and the stored retention information associated with the data storing area; conducting volume management operations to set retention information based on management instructions received from a console to be coupled to the storage system; recording first log information associated with the received management instructions from the console in a log storing area configured with at least one of the plurality of storage devices, the log storing area being different from the data storing area; and recording second log information associated with the received I/O instructions, the second log information associated with the received I/O instructions is stored separately from the first log information; wherein the first log information includes descriptions of the volume management operations based on the received management instructions.