Devices and methods for operating a solid state drive

• US 9,063,846 B2
• Filed: 10/03/2013
• Issued: 06/23/2015
• Est. Priority Date: 05/27/2008
• Status: Active Grant

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Micron Technology, Inc.
• Inventors: Jeddeloh, Joseph M.
• Primary Examiner(s): Li, Aimee
• Assistant Examiner(s): Thammavong, Prasith
• Application Number:
  US14/045,570
• Publication Number:
  US 20140032825A1
• Time in Patent Office: 628 Days
• Field of Search: 711/103
• US Class Current: 1/1
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 12/0638 Combination of memories, e.g. ROM and RAM such as to permit replacement or supplementing of words in one module by words in another module address formation of the next microinstruction G06F9/26; masking faults in memories by using spares or by reconfiguring G11C29/70
• CPC Class Codes: G06F 13/1668 Details of memory controller
• CPC Class Codes: G06F 2212/205 Hybrid memory, e.g. using both volatile and non-volatile memory
• CPC Class Codes: G06F 2212/7211 Wear leveling
• CPC Class Codes: G11C 29/765 in solid state disks
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The present disclosure includes methods and devices for operating a solid state drive. One method embodiment includes receiving an indication of a desired number of write input/output operations (IOPs) per unit time performed by the solid state drive. The method can also include managing the number of write IOPs performed by the solid state drive at least partially based on the desired number of write IOPs per unit time, a number of spare blocks in the solid state drive, and a desired operational life for the solid state drive.

Claims

1. A method for operating a solid state drive, comprising:

managing a number of write input/output operations (IOPs) performed by a solid state drive and a number of spare blocks in the solid state drive at least partially based on a user indicated desired number of write IOPs per unit time, at least partially based on a user indicated desired number of spare blocks in the solid state drive, and at least partially based on a user indicated desired operational life for the solid state drive.

2. The method of claim 1, wherein managing the number of write IOPs performed by the solid state drive includes limiting the number of write IOPs performed by the solid state drive.

3. The method of claim 2, wherein managing the number of write IOPs performed by the solid state drive includes limiting the number of write IOPs performed by the solid state drive to have the solid state drive perform the desired number of write IOPs per unit time.

4. The method of claim 2, further including not limiting the number of write IOPs performed during a burst time period.

5. The method of claim 4, wherein managing the number of write IOPs performed further includes limiting the number of write IOPs at least partially based on the number of write IOPs performed during the burst time period.

6. The method of claim 1, further including sending the number of write IOPs performed by the solid state drive to a self-monitoring, analysis and reporting technology (SMART) interface of the solid state drive.

7. The method of claim 1, further including performing a wear leveling operation on the solid state drive at least partially based on the number of write IOPs performed by the solid state drive.

8. The method of claim 1, further including receiving an indication of the desired number of spare blocks in the solid state drive and an indication of the desired operational life for the solid state drive.

9. The method of claim 8, wherein receiving an indication of a desired number of write IOPs per unit time performed by the solid state drive, the indication of the desired number of spare blocks in the solid state drive, and the indication of the desired operational life for the solid state drive comprises receiving the indications from a user through a user interface associated with the solid state drive.

10. A method for operating a solid state drive, comprising:

setting a desired number of write input/output operations (IOPs) per unit time performed by the solid state drive at least partially based on a user indicated desired amount of spare blocks and at least partially based on a user indicated desired operation life;

managing the number of write IOPs performed by the solid state drive and a number of spare blocks in the solid state drive at least partially based on the desired number of write input/output operations (IOPs) per unit time of the solid state drive, the desired amount of spare blocks, and the desired operational life for the solid state drive to allow the solid state drive to perform for the desired operational life.

11. The method of claim 10, wherein managing further includes not limiting the number of write IOPs performed by the solid state drive over a number of burst periods.

12. The method of claim 11, wherein managing further includes compensating for the number of write IOPs performed during the number of burst periods by further limiting a future number of write IOPs performed by the solid state drive.

13. The method of claim 10, wherein managing further includes allowing a limited number of write IOPs to be performed over a period of time.

14. The method of claim 10, further including managing a number of spare blocks in the solid state drive at least partially based on the desired operational life.

15. The method of claim 10, wherein setting the desired amount of spare blocks includes setting a desired percentage of spare blocks.

16. A solid state memory device, comprising:

a number of solid state memory arrays; and

a controller coupled to the number of solid state memory arrays and configured to;

receive an input from a user through a user interface indicating a desired number of spare blocks in the number of solid state memory arrays,

receive an input from a user through the user interface indicating desired number of write IOPs per unit time,

receive an input from the user through the user interface indicating a desired operational life for the number of solid state memory arrays, and

manage a number of write input/outputs operations (IOPs) performed by the number of solid state memory arrays and a number of spare blocks in the number of solid state memory arrays at least partially based on the desired number of spare blocks in the solid state memory arrays, desired number of write IOPs per unit time, and the desired operational life for the number of solid state memory arrays.

17. The solid state memory device of claim 16, wherein the controller manages a rate at which the number of write IOPs are performed by the number of solid state memory arrays based, at least partially, upon the desired number of spare blocks in the solid state drive and the desired operational life for the solid state memory arrays.

18. The solid state memory device of claim 16, wherein the controller dynamically manages host traffic on the solid state device to reduce wear of the number of solid state memory arrays.

19. The solid state memory device of claim 18, wherein the controller dynamically manages host traffic on the solid state device by acknowledging write IOPs requests with increased delay.

20. The solid state memory device of claim 16, wherein the controller is configured to perform a wear leveling operation that is at least partially based on the number of write IOPs performed by the solid state drive.