Method of operating storage device using program suspension control and storage device performing the same

A storage device comprising:

• a storage controller;
• and
• a plurality of nonvolatile memories controlled by the storage controller,
• wherein the storage controller is configured to:
• receive first information from a host device, the first information associated with an operation of the storage device;
• receive second information internally generated based on a plurality of write requests, a plurality of read requests and the operation of the storage device, the plurality of write requests and the plurality of read requests being received from the host device;
• transmit a plurality of program commands and a plurality of read commands to the plurality of nonvolatile memories, the plurality of program commands and the plurality of read commands corresponding to the plurality of write requests and the plurality of read requests, respectively;
• and
• transmit suspension commands to at least one of the plurality of nonvolatile memories, the suspension commands being generated based on the first information and the second information and being used to temporarily stop program operations performed based on the plurality of program commands,
• wherein a number of transmitting the suspension commands and a timing of transmitting the suspension commands are controlled based on the first information and the second information, and
• wherein, in response to changing at least one of the plurality of write requests and the plurality of read requests, the number of transmitting the suspension commands and the timing of transmitting the suspension commands are adaptively changed.

A method of operating a storage device including a storage controller and a plurality of nonvolatile memories, the storage device configured to communicate with a host device located outside the storage device, the method comprising:

• receiving, by the storage controller, first information from the host device, the first information including a throughput condition and a latency condition, the throughput condition being for the storage device to execute a plurality of write requests and a plurality of read requests received from the host device, the latency condition being for the storage device to execute the plurality of write requests and the plurality of read requests;
• internally generating, by the storage controller, second information including write bandwidth information, read bandwidth information and scheduling overhead information, the write bandwidth information and the read bandwidth information being obtained by monitoring the plurality of write requests and the plurality of read requests, the scheduling overhead information being obtained by monitoring an operation of the storage device;
• transmitting, by the storage controller, a plurality of program commands and a plurality of read commands to the plurality of nonvolatile memories such that a plurality of program operations and a plurality of read operations are performed on the plurality of nonvolatile memories, the plurality of program commands and the plurality of read commands corresponding to the plurality of write requests and the plurality of read requests, respectively;
• and
• transmitting, by the storage controller, first suspension commands to a first nonvolatile memory among the plurality of nonvolatile memories such that the read throttling operation is selectively performed on the first nonvolatile memory, the read throttling operation representing an operation in which first read operations performed on the first nonvolatile memory are restricted while first program operations are being performed on the first nonvolatile memory, the first suspension commands being generated based on the first information and the second information and being used to temporarily stop the first program operations,
• wherein a number of transmitting the first suspension commands and a timing of transmitting the first suspension commands are controlled based on the first information and the second information,
• wherein, in response to changing at least one of the plurality of write requests and the plurality of read requests, the number of transmitting the first suspension commands and the timing of transmitting the first suspension commands are adaptively changed,
• wherein the number of transmitting the first suspension commands and the timing of transmitting the first suspension commands are adjusted to satisfy the throughput condition and the latency condition, and
• wherein transmitting the first suspension commands to the first nonvolatile memory includes:
• calculating a first number of suspension commands based on the first information and the second information, the first number of suspension commands associated with a maximum number of suspension commands capable of generating per unit time in the first nonvolatile memory;
• calculating a second number of suspension commands based on the first number of suspension commands, the second number of suspension commands representing a number of possible suspension commands capable of currently generating in the first nonvolatile memory;
• detecting a first read command based on the first information and the second information, the first read command representing a command that does not satisfy the latency condition in the first nonvolatile memory;
• and
• selectively transmitting the first suspension commands to the first nonvolatile memory based on the second number of suspension commands and the first read command.