A storage system whereby all managers of the storage system can easily collect the history data of the manager of each partition. The storage system is designed such that the memory resources within the system are managed by a system manager while partitions of the memory resources are managed by partition managers assigned for every partition unit. The storage system is provided with management modules that change the configuration of the memory resources corresponding to the content set by the system manager or partition manager, a history data management module that creates history data correlating the identifier of the partition unit that has undergone modification of the configuration of the memory resources, the setting content, and the identification data of the manager, and a history data storage unit that stores the history data.