RECORDING MEDIUM STORING PERFORMANCE EVALUATION ASSISTANCE PROGRAM, PERFORMANCE EVALUATION ASSISTANCE APPARATUS, AND PERFORMANCE EVALUATION ASSISTANCE METHOD

A characteristic amount for a data redundancy method of a storage apparatus, a characteristic amount for performance of a storage device, a phase change multiplicity, which is a multiplicity at a boundary between a low load and a high load, and the number of read requests per unit time are calculated by using redundancy method information of the storage apparatus, the number of storage devices of the storage apparatus, a used ratio of a used storage area, a ratio of read requests to requests, an average data amount of data read in response to a read request, the number of requests per unit time, and a constant decided based on a processing time for a write request in the storage apparatus and a type of a storage device, and a predicted value of an average response time to a read request is calculated by using the calculated values.