Storage device configured to support multi-streams and operation method thereof

A storage device comprising:

• a plurality of nonvolatile memories;
• and
• a storage controller including processing circuitry configured to manage the plurality of nonvolatile memories with a plurality of physical streams and to assign one of the plurality of physical streams to a 0-th virtual stream corresponding to an input/output request from an external host device,
• wherein the storage controller further includes a memory configured to store stream information including a plurality of virtual stream features respectively corresponding to the plurality of physical streams, and
• wherein the processing circuitry is configured to, based on a machine learning model learned in advance through machine learning,
• extract a 0-th representative value from a 0-th virtual stream feature corresponding to the 0-th virtual stream,
• extract a plurality of representative values respectively corresponding to the plurality of physical streams from the stream information,
• calculate distance information indicating a similarity between the 0-th virtual stream and each of the plurality of physical streams, based on the extracted 0-th representative value and the extracted plurality of representative values, and
• assign one of the plurality of physical streams to the 0-th virtual stream based on the distance information.

An operation method of a storage device configured to manage a plurality of nonvolatile memories with a plurality of physical streams, the method comprising:

• receiving an input/output request from an external host device;
• determining a 0-th virtual stream identifier corresponding to the received input/output request;
• extracting a 0-th representative value from a 0-th virtual stream feature of a 0-th virtual stream corresponding to the determined 0-th virtual stream identifier;
• obtaining a first representative value and a second representative value respectively corresponding to a first physical stream and a second physical stream of the plurality of physical streams from a representative value pool;
• calculating distance information including a first similarity between the 0-th virtual stream and the first physical stream and a second similarity between the 0-th virtual stream and the second physical stream, based on the obtained first and second representative values;
• assigning one of the plurality of physical streams to the 0-th virtual stream, based on the distance information;
• performing an operation corresponding to the input/output request, at the assigned physical stream;
• and
• updating the representative value pool based on the 0-th representative value and a physical stream identifier corresponding to the assigned physical stream,
• wherein the extracting of the 0-th representative value and the calculating of the distance information are performed by using a learning model learned in advance through machine learning.