Storage device, storage system, and operating method thereof capable of dynamically allocating write blocks to a stream

A storage system comprising:

• a host;
• and
• a storage device configured to receive a plurality of streams and first real-time information on the plurality of streams from the host,
• wherein the storage device includes:
• a nonvolatile memory device including a plurality of nonvolatile memories;
• and
• a controller configured to calculate a number of write blocks to be allocated to each of the plurality of streams based on the first real-time information, and allocate write blocks of the nonvolatile memory device to each of the plurality of streams based on a result of calculation
• wherein the host is configured to transmit, to the storage device, target performance ratio information on a target performance ratio to be occupied by each of the plurality of streams,
• wherein the controller is further configured to calculate performance achievable by each of the plurality of streams based on the target performance ratio information, and transmit the calculated performance to the host, and
• wherein the controller includes a block calculator configured to, upon receiving an approval on the calculated performance from the host, calculate the number of write blocks to be allocated to each of the plurality of streams based on the calculated performance.

A storage system comprising:

• a host including a host memory, a processing unit configured to execute a program code loaded in the host memory, and an interface circuit configured to transmit data received from the host memory and the processing unit to an outside;
• and
• a storage device configured to exchange the data with the host,
• wherein the storage device includes:
• a controller configured to allocate write blocks to each of a plurality of streams, the controller including a block calculator which calculates a number of write blocks to be reallocated to each of the plurality of streams based on first real-time information on the plurality of streams;
• a memory device configured to exchange the data with the controller through a channel, the memory device including a plurality of nonvolatile memories;
• and
• a buffer memory including a memory different from the plurality of nonvolatile memories,
• wherein the controller further includes an information storage memory configured to store second real-time information on the plurality of streams,
• wherein the second real-time information on the plurality of streams includes write frequency information on a number of times data is written into each of the plurality of streams, and
• wherein a write count table in which the write frequency information is recorded is stored in the information storage memory.