Method and Apparatus for Redundant Array of Independent Drives Parity Quality of Service Improvements

• US 20200133896A1
• Filed: 10/25/2018
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Marks, Kevin T., Nelogal, Chandrasekhar
• Granted Patent: US 10,891,244 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 13/1668 Details of memory controller
• CPC Class Codes: G06F 13/24 using interrupt G06F13/32 takes precedence
• CPC Class Codes: G06F 13/4221 being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
• CPC Class Codes: G06F 2213/0036 Small computer system interface [SCSI]
• CPC Class Codes: G06F 9/30047 Prefetch instructions; cache control instructions

Abstract

An information handling system includes a host configured to write a non-volatile memory express (NVMe) command on a memory submission queue slot. The NVMe command includes a pre-fetch command and a non-completion command. A controller uses the pre-fetch command to monitor read operations, and to place on hold an execution of the monitored read operations and an issuance of an interrupt in response to the non-completion command.

Claims

1. An information handling system, comprising:

a host configured to write a non-volatile memory express command that includes an advisory command and a non-completion command; and

a controller coupled to the host, wherein the controller is adapted to utilize the advisory command to monitor read operations, and to place on hold an execution of the monitored read operations and an issuance of an interrupt in response to the non-completion command.

2. The information handling system of claim 1, wherein the advisory command is implemented by a pre-fetch command that is added to a context attribute of a Dataset Management command.

3. The information handling system of claim 2, wherein the pre-fetch command includes a bit flag that is taken from reserved bits of the Dataset Management command.

4. The information handling system of claim 1, wherein the advisory command is implemented by a pre-fetch command that is added to a context attribute of a small computer system interface command—

PREFETCH.

5. The information handling system of claim 4, wherein the pre-fetch command includes a bit flag that is derived from reserved bits of a small computer system interface command descriptor block.

6. The information handling system of claim 1, wherein the advisory command is implemented by a hint command.

7. The information handling system of claim 6, wherein the non-completion command is a new command that is independent from the hint command.

8. The information handling system of claim 1, wherein the non-completion command places on hold a writing of a completion queue entry by the controller.

9. The information handling system of claim 1, further comprising a redundant array of independent disks (RAID) array coupled to the controller, wherein the controller implements the advisory command and non-completion command to the RAID array.

10. A method, comprising:

writing, by a host, of a non-volatile memory express command that includes an advisory command and a non-completion command;

using, by a controller, of the advisory command to monitor read operations and in response to the non-completion command, the controller places on hold;

an execution of the monitored read operations; and

issuance of an interrupt.

11. The method of claim 10, wherein the advisory command is represented by a pre-fetch command that is added to a context attribute of a Dataset Management command.

12. The method of claim 11, wherein the pre-fetch command is represented by a bit flag that is derived from reserved bits of Dataset Management command.

13. The method of claim 10, wherein the non-completion command is represented by a bit flag that is derived from reserved bits of Dataset Management command.

14. The method of claim 10, wherein the advisory command is implemented by a hint command.

15. The method of claim 14, wherein the non-completion command is a new command that is independent and separate from the hint command.

16. The method of claim 10, wherein the hint command includes advance notifications of an input/output transaction.

17. An information handling system, comprising:

a host configured to write a non-volatile memory express (NVMe) command on a memory submission queue slot, wherein the NVMe command includes a pre-fetch command and a non-completion command;

a controller coupled to the host, wherein the controller is adapted to utilize the pre-fetch command to monitor read operations, and to place on hold an execution of the monitored read operations and an issuance of an interrupt in response to the non-completion command.

18. The information handling system of claim 17, wherein the pre-fetch command is an added context attribute of a Dataset Management command.

19. The information handling system of claim 18, wherein the pre-fetch command includes a bit flag that is derived from reserved bits of the Dataset Management command.

20. The information handling system of claim 17, wherein the non-completion command includes a bit flag that is derived from reserved bits of the Dataset Management command.