Patent ID: 8214333

Claim:
A storage system, comprising: a plurality of first interfaces, each of the plurality of first interfaces being coupled to a host computer; a plurality of second interfaces, each of the plurality of second interfaces being coupled to a manager terminal; a plurality of control units, each of the plurality of control units being coupled to at least one of the first interfaces and at least one of the second interfaces, and each of the plurality of control units including a processor and a cache memory; a plurality of storage units storing a template that specifies a format of log data generated by each of the plurality of control units, wherein the template includes item names provided in a specified order, the item names comprising information regarding time, an operator, an event description, an event result, an operation target device, and a target device; and one or more disk drives in which data that is requested to be read by the host computer is stored, wherein each of the plurality of control units detects an access from the host computer to a coupled first interface of the plurality of first interfaces and an access from the manager terminal to a coupled second interface of the plurality of second interfaces, generates the log data of operations according to the accesses, and stores the log data in the cache memory of each of the plurality of control units, wherein a certain control unit of the plurality of control units collects log data generated by each of the other control units from the cache memory of each of the other control units and unifies the collected log data using the template that specifies the format in the cache memory of the certain control memory, wherein the certain control unit writes the log data collected from the other control units and the unified log data generated by the certain control unit into a log storage area configured in the one or more disk drives, and wherein the certain control unit performs management by synchronizing all the log data within the storage system.