SPECIFIC METHOD FOR ENHANCEMENT OF PERFORMANCE OF STORAGE SYSTEM

PROBLEM TO BE SOLVED: To provide a method for improving and specifying performance of storage system by which the performance of an operated storage system is evaluated with the purpose of monitoring or predicting such a state that gives an adverse influence on the performance and, when it is detected that the performance is not optimum, the user of the system is warned of it so that the user can take a measure to improve the performance. SOLUTION: A performance measuring standard is defined for measuring a plurality of performances during the operation of a data storage system (5) and a specification is provided for the expected value (52). During the operation of the system, the performance measuring standard is sampled (56) and a performance hysteresis is generated and how the system operates during a fixed period is displayed (58). An evaluating period is selected and whether or not an arbitrary measuring standard meets the specification is discriminated (62). When one or more performance measuring standards do not meet the specification, one or more proposals which are useful for improving the performance of the data storage system are given (68).