METHOD AND SYSTEM FOR MANAGING NON-VOLATILE MEMORY

• US 20180188954A1
• Filed: 12/30/2016
• Published: 07/05/2018
• Est. Priority Date: 12/30/2016
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Granted Patent: US 10,452,468 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 11/0727 in a storage system, e.g. in a DASD or network based storage system drivers for digital recording or reproducing units G06F3/06; circuits for error detection or correction within digital recording or reproducing units G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097
• CPC Class Codes: G06F 11/076 by exceeding a count or rate limit, e.g. word- or bit count limit
• CPC Class Codes: G06F 11/0793 Remedial or corrective actions recovery from an exception in an instruction pipeline G06F9/3861; by retry G06F11/1402; for recovering from a failure of a protocol instance or entity H04L69/40
• CPC Class Codes: G06F 2201/81 Threshold
• CPC Class Codes: G06F 2201/85 Active fault masking without idle spares active fault masking without idle spare hardware where processing functionality is redundant G06F11/2035
• CPC Class Codes: G06F 2201/88 Monitoring involving counting
• CPC Class Codes: G11C 29/00 Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
• CPC Class Codes: G11C 29/44 Indication or identification of errors, e.g. for repair
• CPC Class Codes: G11C 29/52 Protection of memory contents; Detection of errors in memory contents

Abstract

The subject technology provides for managing a data storage system. A data operation error for a data operation initiated in a first non-volatile memory die of a plurality of non-volatile memory die in the data storage system is detected. An error count for an error type of the data operation error for the first non-volatile memory die is incremented. The incremented error count satisfies a first threshold value for the error type of the data operation error is determined. The first non-volatile memory die is marked for exclusion from subsequent data operations.

Claims

1. A method for managing a data storage system, the method comprising:

detecting a data operation error for a data operation initiated in a first non-volatile memory die of a plurality of non-volatile memory die in the data storage system;

incrementing an error count for an error type of the data operation error for the first non-volatile memory die;

determining the incremented error count satisfies a first threshold value for the error type of the data operation error; and

marking the first non-volatile memory die for exclusion from subsequent data operations.

2. The method of claim 1, wherein the error count for the error type of the data operation error comprises a cumulative error count for all blocks of the first non-volatile memory die.

3. The method of claim 1, wherein the error type of the data operation error comprises one of a program error type, a read error type, or an erase error type, and

wherein a respective error count is maintained for the first non-volatile memory die for each of the program error type, the read error type, and the erase error type, and a respective first threshold value is maintained for each of the program error type, the read error type, and the erase error type.

4. The method of claim 3, further comprising determining the error type of the data operation error, wherein incrementing the error count comprises incrementing the respective error count for the determined error type.

5. The method of claim 1, further comprising selecting the first threshold value for the error type of the data operation error based on a state of life of the data storage system.

6. The method of claim 1, further comprising:

incrementing a consecutive count for the error type of the data operation error for the first non-volatile memory die;

determining the consecutive count satisfies a second threshold value for the error type of the data operation error; and

marking the first non-volatile memory die for exclusion from subsequent data operations,

wherein the consecutive error count for the error type of the data operation error for the first non-volatile memory die is reset upon successful completion of a data operation in the first non-volatile memory die.

7. The method of claim 6, wherein the second threshold value is less than the first threshold value.

8. A data storage system, comprising:

a plurality of storage devices, each storage device comprising a plurality of non-volatile memory die; and

a controller coupled to the plurality of storage devices, wherein the controller is configured to;

detect a data operation error for a data operation initiated in a first non-volatile memory die of the plurality of non-volatile memory die in the data storage system;

increment an error count for an error type of the data operation error for the first non-volatile memory die;

determine the incremented error count satisfies a first threshold value for the error type of the data operation error; and

mark the first non-volatile memory die for exclusion from subsequent data operations.

9. The data storage system of claim 8, wherein the error count for the error type of the data operation error comprises a cumulative error count for all blocks of the first non-volatile memory die.

10. The data storage system of claim 8, wherein the error type of the data operation error comprises one of a program error type, a read error type, or an erase error type, and

wherein a respective error count is maintained for the first non-volatile memory die for each of the program error type, the read error type, and the erase error type, and a respective first threshold value is maintained for each of the program error type, the read error type, and the erase error type.

11. The data storage system of claim 10, wherein the controller is further configured to:

determine the error type of the data operation error, wherein incrementing the error count comprises incrementing the respective error count for the determined error type.

12. The data storage system of claim 8, the controller is further configured to:

select the first threshold value for the error type of the data operation error based on a state of life of the data storage system.

13. The data storage system of claim 8, further comprising:

incrementing a consecutive count for the error type of the data operation error for the first non-volatile memory die;

determining the consecutive count satisfies a second threshold value for the error type of the data operation error; and

marking the first non-volatile memory die for exclusion from subsequent data operations, wherein the consecutive error count for the error type of the data operation error for the first non-volatile memory die is reset upon successful completion of a data operation in the first non-volatile memory die.

14. The data storage system of claim 13, wherein the controller if further configured to:

increment a consecutive count for the data operation error for the first non-volatile memory die;

determine the consecutive count satisfies a third threshold value for the data operation error for the first non-volatile memory die; and

mark the first non-volatile memory die for exclusion from subsequent data operations, wherein the consecutive error count for the data operation error for the first non-volatile memory die is reset upon successful completion of a data operation in the first non-volatile memory die.

15. The data storage system of claim 14, wherein the third threshold value is less than the second threshold value, and the second threshold value is less than the first threshold value.

16. A machine-readable media encoded with executable instructions which, when executed by a processor, cause the processor to perform operations comprising:

detecting a data operation error for a data operation initiated in a first non-volatile memory die of a plurality of non-volatile memory die in a data storage system;

incrementing an error count for an error type of the data operation error for the first non-volatile memory die, wherein the error count for the error type of the data operation error comprises a cumulative error count for all blocks of the first non-volatile memory die;

determining the incremented error count satisfies a first threshold value for the error type of the data operation error; and

marking the first non-volatile memory die for exclusion from subsequent data operations.

17. The machine-readable media of claim 16, wherein the error type of the data operation error comprises one of a program error type, a read error type, or an erase error type, and

wherein a respective error count is maintained for the first non-volatile memory die for each of the program error type, the read error type, and the erase error type, and a respective first threshold value is maintained for each of the program error type, the read error type, and the erase error type.

18. The machine-readable media of claim 17, wherein the operations further comprising determining the error type of the data operation error, wherein incrementing the error count comprises incrementing the respective error count for the determined error type.

19. The machine-readable media of claim 16, wherein the operations further comprising selecting the first threshold value for the error type of the data operation error based on a state of life of the data storage system.

20. The machine-readable media of claim 16, wherein the operations further comprising:

incrementing a consecutive count for the data operation error for the first non-volatile memory die;

determining the consecutive count satisfies a second threshold value for the data operation error for the first non-volatile memory die; and

marking the first non-volatile memory die for exclusion from subsequent data operations,

wherein the consecutive error count for the data operation error for the first non-volatile memory die is reset upon successful completion of a data operation in the first non-volatile memory die.

21. The machine-readable media of claim 20, wherein the second threshold value is less than the first threshold value.

22. A system comprising:

means for detecting a data operation error for a data operation initiated in a first non-volatile memory die of a plurality of non-volatile memory die in the data storage system;

means for incrementing an error count for an error type of the data operation error for the first non-volatile memory die;

means for determining the incremented error count satisfies a first threshold value for the error type of the data operation error; and

means for marking the first non-volatile memory die for exclusion from subsequent data operations.

23. The system of claim 22, wherein the error count for the error type of the data operation error comprises a cumulative error count for all blocks of the first non-volatile memory die.

24. The system of claim 22, wherein the error type of the data operation error comprises one of a program error type, a read error type, or an erase error type, and

wherein a respective error count is maintained for the first non-volatile memory die for each of the program error type, the read error type, and the erase error type, and a respective first threshold value is maintained for each of the program error type, the read error type, and the erase error type.

25. The system of claim 24, further comprising means for determining the error type of the data operation error, wherein incrementing the error count comprises incrementing the respective error count for the determined error type.

26. The system of claim 22, further comprising means for selecting the first threshold value for the error type of the data operation error based on a state of life of the data storage system.

27. The system of claim 22, further comprising:

means for incrementing a consecutive count for the error type of the data operation error for the first non-volatile memory die;

means for determining the consecutive count satisfies a second threshold value for the error type of the data operation error; and

means for marking the first non-volatile memory die for exclusion from subsequent data operations,

wherein the consecutive error count for the error type of the data operation error for the first non-volatile memory die is reset upon successful completion of a data operation in the first non-volatile memory die.

28. The system of claim 27, wherein the second threshold value is less than the first threshold value.