Method and device for determining causes of performance degradation for storage systems

An apparatus for determining a cause of performance degradation of a storage system, including one or more processors and one or more memories configured to perform operations, comprising:

• monitoring performance of the storage system according to a predetermined policy, wherein monitoring performance of the storage system according to a predetermined policy comprises tracking a performance metric of a monitoring target to obtain original performance data of the monitoring target;
• generating, based on a system performance baseline, a performance degradation event from a result of the monitoring, wherein generating the performance degradation event from the result of the monitoring based on the system performance baseline comprises comparing the original performance data with a latest system performance baseline and generating the performance degradation event based on a result of the comparing;
• obtaining information about the performance degradation in response to the performance degradation event;
• analyzing the information offline to determine the cause of the performance degradation;
• and
• recording the performance degradation event as a four-element tuple, wherein the four-element tuple includes a latest performance statistic, an indicator of the performance degradation, a degree of the performance degradation, and a count for reaching the degree of the performance degradation.