Storage system and method of operating the storage system

Patent metadata

Field	Value
Publication number	US-12373336-B2
Application number	US-202318183592-A
Country	US
Kind code	B2
Filing date	Mar 14, 2023
Priority date	Jul 19, 2022
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A storage system includes a plurality of storage devices. Each of the plurality of storage devices includes a nonvolatile memory device, a buffer memory and a memory controller that controls the nonvolatile memory device and the buffer memory. At least one storage device of the plurality of storage devices is a computational storage device. The computational storage device further includes a storage controller that performs a computational operation for controlling the storage system.

First claim

What is claimed is:

1. A storage system comprising:
a plurality of storage devices, each of the plurality of storage devices including
a nonvolatile memory device,
a buffer memory and
a memory controller configured to control the nonvolatile memory device and the buffer memory, and

at least one storage device of the plurality of storage devices is a computational storage device further including a storage controller configured to perform a computational operation for managing the storage system including a parity generating computational operation for data recovery or a data de-duplication computational operation,
wherein the storage controller is configured such that the computational operation includes generating parity bits in response to performing an operation on user data and storing the user data and the parity bits in at least two of the plurality of storage devices and
wherein the computational storage device is configured to
receive a host request from a host, the host request including a first logical address,
convert the first logical address of the host request to a second logical address of a controlled one of the plurality of storage devices based on a storage identifier, the computational storage device including a storage mapping table which includes the storage identifier linking the first logical address and the second logical address,
control the controlled one of the plurality of storage devices in response to the host request and the second logical address;
control the controlled one of the plurality of storage devices to transmit a completion response based on the host request and the second logical address to the computational storage device;
convert the second logical address to the first logical address; and
transmit the completion response and the first logical address to the host.

2. The storage system of claim 1 , wherein the storage controller is further configured to perform a compression computational operation.

3. The storage system of claim 1 , wherein the plurality of storage devices other than the computational storage device are normal storage devices that do not include the storage controller, the normal storage devices each including a first nonvolatile memory device, the computational storage device including a second nonvolatile memory device different from the first nonvolatile memory device.

4. The storage system of claim 3 , wherein
the computational storage device configured to control the normal storage devices in response to the host request, and
the normal storage devices do not directly receive the host request from the host.

5. The storage system of claim 1 , wherein the computational storage device is configured to:
control a normal storage device of the plurality of storage devices in response to the host request being a read request such that the normal storage device performs a read operation that reads read data from the nonvolatile memory device of the normal storage device; and
provide the host with the read data that are read from the nonvolatile memory device of the normal storage device.

6. The storage system of claim 5 , wherein
the read request from the host includes a read command and the first logical address, and
the controlled one of the plurality of storage devices is configured to convert the second logical address into a physical address of the nonvolatile memory device of the controlled one of the plurality of storage devices, and perform the read operation based on the physical address.

7. The storage system of claim 6 , wherein
the buffer memory of the computational storage device includes the storage mapping table configured to store the storage identifier representing the normal storage device in which the read data are stored, and the second logical address for the normal storage device, and
the computational storage device is configured to convert the first logical address for the host into the second logical address for the controlled one of the plurality of storage devices based on the storage mapping table.

8. The storage system of claim 1 , wherein the computational storage device is configured to:
control the controlled one of the plurality of storage devices in response to the host request being a write request including write data such that the controlled one of the plurality of storage devices performs a write operation that writes the write data to the nonvolatile memory device of the controlled one of the storage devices.

9. The storage system of claim 8 , wherein
the write request from the host further includes a write command and the first logical address, and
the controlled one of the storage devices is configured to convert the second logical address into a physical address of the nonvolatile memory device of the controlled one of the storage devices, and perform the write operation based on the physical address.

10. The storage system of claim 1 , wherein at least one of the buffer memory and the nonvolatile memory device of the computational storage device is configured to function as a cache memory.

11. The storage system of claim 1 , wherein the computational storage device is configured to:
determine, based on the request being a read request, whether the buffer memory of the computational storage device stores read data requested by the read request,
wherein, based on the read data being stored in the buffer memory of the computational storage device, the computational storage device is configured to provide the host with the read data stored in the buffer memory of the computational storage device, and
wherein, based on the read data being not stored in the buffer memory of the computational storage device, the computational storage device is configured to control a normal storage device of the plurality of storage devices such that the normal storage device performs a read operation that reads the read data from the nonvolatile memory device of the normal storage device, and provide the host with the read data that are read from the nonvolatile memory device of the normal storage device.

12. The storage system of claim 1 , wherein the computational storage device is configured to:
determine based on the host request being a read request, whether the buffer memory of the computational storage device stores read data requested by the read request; and
determine whether the nonvolatile memory device of the computational storage device stores the read data,
wherein, based on the read data being stored in the buffer memory of the computational storage device, the computational storage device is configured to provide the host with the read data stored in the buffer memory of the computational storage device,
wherein, based on the read data not being stored in the buffer memory of the computational storage device, but being stored in the nonvolatile memory device of the computational storage device, the computational storage device is configured to read the read data from the nonvolatile memory device of the computational storage device, and provide the host with the read data that are read from the nonvolatile memory device of the computational storage device, and
wherein, based on the read data not being stored in the buffer memory and the nonvolatile memory device of the computational storage device, the computational storage device is configured to control a normal storage device of the plurality of storage devices such that the normal storage device performs a read operation that reads the read data from the nonvolatile memory device of the normal storage device, and provide the host with the read data that are read from the nonvolatile memor

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Hyunjin

Classifications

• G06F12/10

  Address translation · CPC title

• G06F2212/7205

  Cleaning, compaction, garbage collection, erase control · CPC title

• G06F2212/7211

  Wear leveling · CPC title

• G06F3/067

  Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS] · CPC title

• G06F3/0659

  Command handling arrangements, e.g. command buffers, queues, command scheduling · CPC title