RAID data management method of improving data reliability and RAID data storage device

• US 9,032,245 B2
• Filed: 06/14/2012
• Issued: 05/12/2015
• Est. Priority Date: 08/30/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Roh, Kangho
• Primary Examiner(s): SCHELL, JOSEPH O
• Application Number:
  US13/517,723
• Publication Number:
  US 20130055012A1
• Time in Patent Office: 1,062 Days
• Field of Search: 714/6.22, 714/6.24, 714/6.32, 714/6.1, 714/6.11, 714/6.13, 711/104, 711/114
• US Class Current: 714/6.22
• CPC Class Codes: G06F 11/108 Parity data distribution in semiconductor storages, e.g. in SSD
• CPC Class Codes: G06F 11/20 using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements

Abstract

A data storage device and a method of managing data in the data storage device to improve data reliability are provided. In the method of managing data, one of control management information about a memory block of nonvolatile memory in which data will be written and control management information about the data are received. A redundant array of independent disks (RAID) parity page ratio is determined according to the control management information. When a data write operation mode is performed, parity data is written in a parity page of the memory block according the RAID parity page ratio. According to some embodiments of the inventive concepts, since a RAID parity page ratio is selectively determined according to control management information, reliability of data is secured or increased.

Claims

1. A method of controlling a redundant array of independent disks (RAID) memory storage comprising:

determining a RAID configuration based on control management information, the RAID configuration including a RAID parity page ratio;

writing data to the RAID memory storage using the RAID configuration; and

writing parity data to a portion of the RAID memory storage allocated for parity data based on the RAID parity page ratio, wherein the writing parity data includes,

calculating a parity page interval as a ratio of a number of data pages to a number of parity pages represented as a whole number, the number of parity pages being based on the RAID parity page ratio,

checking whether a write number of a data page is less than or equal to the parity page interval, and

resetting the write number of the data page in response to the writing parity data.

2. The method of claim 1, wherein the control management information comprises an erase count value of a memory block.

3. The method of claim 2, wherein the RAID parity page ratio is directly proportional to the erase count value of the memory block.

4. The method of claim 1, wherein the control management information comprises error occurrence frequency information of a memory block.

5. The method of claim 4, wherein the RAID parity page ratio is directly proportional to the error occurrence frequency of the memory block.

6. The method of claim 1, wherein the control management information is a host command.

7. The method of claim 1, wherein the control management information is information distinguishing whether the data is user data or metadata.

8. The method of claim 1, wherein the control management information is information distinguishing whether the data is user data or data about a reliability of the RAID memory storage.

9. The method of claim 1, wherein the RAID memory storage includes a nonvolatile NAND flash memory.

10. The method of claim 1, wherein the parity data is comparative information of data stored in a RAID buffer.

11. The method of claim 1, wherein the RAID parity page ratio is determined based on at least one of an erase count value of a memory block, an error occurrence frequency of the memory block, an importance of the data, and a host command.

12. The method of claim 11, further comprising:

determining whether the data includes metadata.

13. The method of claim 11, further comprising:

determining the erase count value of the memory block.

14. The method of claim 11, further comprising:

determining the error occurrence frequency of the memory block.