Solid state drive data storage system and method

• US 8,819,334 B2
• Filed: 06/17/2013
• Issued: 08/26/2014
• Est. Priority Date: 07/13/2009
• Status: Active Grant

• Current Assignee: Dell International LLC (Dell Technologies Inc.)
• Original Assignee: Compellent Technologies Incorporated (Dell Technologies Inc.)
• Inventors: Aszmann, Lawrence E., Klemm, Michael J., Pittelko, Michael H.
• Primary Examiner(s): Rojas, Midys
• Application Number:
  US13/919,353
• Publication Number:
  US 20130297850A1
• Time in Patent Office: 435 Days
• Field of Search: 711/103, 711/154, 711/E12.008, 711/E12.001
• US Class Current: 711/103
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/7202 Allocation control and policies
• CPC Class Codes: G06F 2212/7208 Multiple device management, e.g. distributing data over multiple flash devices
• CPC Class Codes: G06F 3/0608 Saving storage space on storage systems
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0649 Lifecycle management
• CPC Class Codes: G06F 3/0688 Non-volatile semiconductor memory arrays

Abstract

The present disclosure relates to a data storage system and method that includes at least two solid state devices that can be classified in at least two different efficiency levels, wherein data progression is used to allocate data to the most cost-appropriate device according to the nature of the data.

Claims

1. A data storage system comprising a plurality of solid state devices, each solid state device being read optimized or read/write optimized and configured for on-demand conversion between read optimization and read/write optimization, wherein data progression is used to allocate data to the most cost-appropriate device according to how frequently the data is accessed.

2. The system of claim 1, wherein the plurality of solid state devices includes at least one single-level cell device, and at least one multi-level cell device.

3. The system of claim 2, wherein at least one a single-level cell device is read/write optimized, and wherein at least one multi-level cell device is read optimized.

4. The system of claim 3, wherein the multi-level cell device and the single-level cell device can be either NOR or NAND devices.

5. The system of claim 1, further comprising at least one hard disk drive.

6. The system of claim 5, wherein data progression is used to move infrequently accessed data to a less costly storage device, and to move frequently accessed data to a faster storage device.

7. The system of claim 1, wherein data progression is used to move infrequently accessed data to a less costly storage device, and to move frequently accessed data to a faster storage device.

8. The system of claim 1, wherein the solid state devices use either RAM-based memory or flash-based memory.

9. A method for efficiently storing data in a data storage system that comprises a plurality of solid state devices, each solid state device being read optimized or read/write optimized and configured for on-demand conversion between read optimization and read/write optimization, comprising using data progression to move data to the most cost-appropriate solid state device according to how frequently the data is accessed.

10. The method of claim 9, wherein the data storage system further includes at least one hard disk drive.

11. The method of claim 10, further comprising determining a cost of storage for each of the plurality of solid state devices and the at least one hard disk drive.

12. The method of claim 11, further comprising classifying each of the plurality of solid state devices and the at least one hard disk drive based on the cost relative to one another.

13. The method of claim 12, wherein the cost of storage of each of the plurality of solid state devices and the at least one hard disk drive is based on efficiency of the respective device.

14. The method of claim 9, further comprising determining a cost of storage for each of the plurality of solid state devices.

15. The method of claim 14, further comprising classifying each of the plurality of solid state devices based on the cost relative to one another.

16. The method of claim 15, wherein the cost of storage of each of the plurality of solid state devices is based on efficiency of the respective device.

17. The method of claim 15, wherein the cost of storage of each of the plurality of solid state devices is based on physical cost of the respective device.

18. The method of claim 15, wherein the cost of storage of each of the plurality of solid state devices and the at least one hard disk drive is based on physical cost of the respective device.

19. The method of claim 9, wherein the data storage system further includes at least one non-solid state storage device.