Storage device and storage system

An operating method of a storage system, the operating method comprising:

• receiving an operating condition of a latency issue detection operation;
• generating a latency table based on the operating condition;
• receiving an asynchronous event request (AER) command;
• receiving a plurality of first type commands;
• measuring a plurality of latencies of the plurality of first type commands;
• counting a number of occurrences of the plurality of latencies within a first time period, the first time period being a time length among the plurality of latencies;
• detecting a latency issue based on the number of occurrences exceeding a predetermined threshold value;
• and
• transmitting latency data comprising time points when each of the plurality of first type commands are received, based on the AER command.

A storage device, comprising:

• a host interface configured to receive a plurality of first type commands;
• a memory storing instructions and one or more processors communicatively coupled to the host interface and to the memory, wherein the one or more processors are configured to execute the instructions to:
• measure a plurality of latencies of the plurality of first type commands;
• count a number of occurrences of the plurality of latencies within a first time period, the first time period being a time length among the plurality of latencies;
• generate latency data comprising time points when each of the plurality of first type commands are received, based on the number of occurrences exceeding a predetermined threshold value;
• and
• output, through the host interface, the latency data based on an asynchronous event request (AER) command.