Storage system with performance limit detection unit and processing percentage determination unit for ensuring priority data performance

摘要

A highly-reliable storage system and data input/output control method, which can ensure priority data input/output performance, is provided. A performance limit, which is the number of data input/output processes per unit of time, is detected; and a processing percentage for each of one or more priority targets for which data input/output processing should be prioritized, and a group of one or more non-priority targets that includes of one or more other targets, which correspond to input/output processing request types, is determined based on the performance limit detected, and a targeted performance; and the storage apparatus executes data input/output processing for the one or more priority targets and the group of one or more non-priority targets at respective frequencies determined by the processing percentage determination unit.