Storage controller, storage device, and operation method of storage device

A storage controller configured to control a nonvolatile memory device, the storage controller comprising:

• a host interface circuit configured to receive a first write request from an external host;
• at least one hardware accelerator configured to add the first write request to a first fragment, select “n” streams among a plurality of pre-allocated streams having a cosine similarity higher than a threshold with respect to a first fragment when the first fragment is greater than or equal a reference value, apply statistical information of the first fragment and the “n” pre-allocated streams to a machine learning model to detect a first sequential stream associated with the first fragment among the “n” pre-allocated streams, and allocate a stream identifier of the first sequential stream to the first fragment;
• a flash translation layer configured to translate a logical block address of the first write request into a physical block address based on the stream identifier allocated to the first sequential stream;
• a processor configured to drive the flash translation layer;
• and
• a memory interface circuit configured to provide the nonvolatile memory device with the physical block address, write data of the first write request, and a write command to store the write data in the nonvolatile memory device,
• wherein “n” is a natural number of at least two.

A storage device comprising:

• a plurality of nonvolatile memories;
• and
• a storage controller configured to communicate with the plurality of nonvolatile memories through a plurality of channels,
• wherein the storage controller is configured to:
• receive a plurality of write requests from an external host;
• add a first fragment to one of the write requests;
• select “n” streams among a plurality of pre-allocated streams having a cosine similarity higher than a threshold with respect to the first fragment when a size of the first fragment is greater than or equal a reference value;
• perform machine learning on statistical information of the received plurality of write requests and statistical information of the “n” pre-allocated streams;
• detect a first sequential stream associated with the received plurality of write requests from among the “n” pre-allocated streams based on a result of the machine learning;
• allocate a stream identifier of the first sequential stream to the received plurality of write requests;
• and
• store a plurality of write data corresponding to the plurality of write requests in one of the plurality of nonvolatile memories, based on the allocated first sequential stream,
• wherein “n” is a natural number of at least two.