Abstract: A system is provided in which a server which provides a service to a client terminal, a disk array device upon which data used by the server is stored, and a monitor terminal which detects a bottleneck on the disk array device, are connected via a network. The disk array device or the server calculates performance information including the number of IO requests issued by the server, the times required for processing the IO requests, and a resource utilization ratio for each resource included in the disk array device. The monitor terminal establishes a reference point based upon an average response time obtained by dividing the processing time included in the performance information by the number of the IO requests. And the system is characterized in that a resource is identified as a bottleneck, based upon the resource utilization ratio in a predetermined interval before the reference point.

Abstract: A performance information display method for displaying system performance information on a display apparatus comprises: periodically storing the system performance information in a storage device; reading the performance information out of the storage device; displaying the readout performance information based on a time axis; changing, in accordance with a time period to be displayed as the time axis on the display apparatus, a time unit for determining values to be displayed based on the time axis; and displaying the values as average values or peak values taken at intervals of the unit time. The method thus serves to reduce the time and trouble required to display the performance information, and makes it possible to grasp the operating performance of the system accurately.