WEAR MANAGEMENT APPARATUS AND METHOD FOR STORAGE SYSTEM

• US 20140068153A1
• Filed: 05/22/2013
• Published: 03/06/2014
• Est. Priority Date: 09/05/2012
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: GU, Bon-Cheol, LEE, Ju-Pyung
• Application Number:
  US13/899,856
• Publication Number:
  US 20140068153A1
• Time in Patent Office: Days
• US Class Current: 711/103
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/7204 Capacity control, e.g. partitioning, end-of-life degradation
• CPC Class Codes: G06F 2212/7208 Multiple device management, e.g. distributing data over multiple flash devices
• CPC Class Codes: G06F 2212/7211 Wear leveling
• CPC Class Codes: G06F 3/0604 Improving or facilitating administration, e.g. storage management
• CPC Class Codes: G06F 3/0616 in relation to life time, e.g. increasing Mean Time Between Failures [MTBF]
• CPC Class Codes: G06F 3/064 Management of blocks
• CPC Class Codes: G06F 3/0652 Erasing, e.g. deleting, data cleaning, moving of data to a wastebasket
• CPC Class Codes: G06F 3/0653 Monitoring storage devices or systems
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
• CPC Class Codes: G06F 3/0688 Non-volatile semiconductor memory arrays

Abstract

A wear management apparatus and a wear management method of a storage system including storage nodes are provided. The wear management apparatus includes a monitor unit configured to collect status information about each of the storage nodes. The wear management apparatus further includes a wear management unit configured to establish a wear progress model with respect to the storage nodes based on the status information, and control a wear acceleration index of each of the storage nodes based on the wear progress model and a wear management policy.

Claims

1. A wear management apparatus of a storage system comprising storage nodes, the wear management apparatus comprising:

a monitor unit configured to collect status information about each of the storage nodes; and

a wear management unit configured to

establish a wear progress model with respect to the storage nodes based on the status information, and

control a wear acceleration index of each of the storage nodes based on the wear progress model and a wear management policy.

2. The wear management apparatus of claim 1, wherein the wear management unit is further configured to adjust a free space ratio of each of the storage nodes to control the wear acceleration index.

3. The wear management apparatus of claim 1, further comprising:

a data distribution unit configured to store data in each of the storage nodes, and delete the data from each of the storage nodes,

wherein the wear management unit is further configured to control the data distribution unit to store or delete the data, to control the wear acceleration index.

4. The wear management apparatus of claim 1, further comprising:

a data transfer unit configured to move data among the storage nodes,

wherein the wear management unit is further configured to control the data transfer unit move the data, to control the wear acceleration index.

5. The wear management apparatus of claim 1, wherein the status information comprises an overall capacity, or an amount of valid data, or a distribution of the data, or a wear level of the data, or any combination thereof.

6. The wear management apparatus of claim 1, wherein the wear management policy comprises a policy of equally wearing the storage nodes, or a policy of sequentially wearing a storage node among the storage nodes that comprises a greatest endurance among endurances of the storage nodes, or a policy of completely wearing a storage node among the storage nodes that comprises a least endurance among the endurances of the storage nodes.

7. The wear management apparatus of claim 1, wherein each of the storage nodes comprises a NAND flash memory.

8. The wear management apparatus of claim 1, wherein if the wear management policy comprises a policy of equally wearing the storage nodes, the wear management unit is further configured to control the wear acceleration index based on an endurance of each of the storage nodes to wear the storage nodes almost simultaneously.

9. The wear management apparatus of claim 1, wherein if the wear management policy comprises a policy of sequentially wearing a storage node among the storage nodes that comprises a greatest endurance among endurances of the storage nodes, the wear management unit is further configured to control the wear acceleration index of the storage node to comprise a greatest wear acceleration index among the wear acceleration index of each of the storage nodes, to wear the storage node the fastest.

10. The wear management apparatus of claim 1, wherein if the wear management policy comprises a policy of completely wearing a storage node among the storage nodes that comprises a least endurance among the endurances of the storage nodes, the wear management unit is further configured to:

control the wear acceleration index of the storage node to comprise a greatest wear acceleration index among the wear acceleration index of each of the storage nodes, to wear the storage node the fastest; and

replace the storage node with a new storage node when the storage node is completely worn out.

11. A wear management method of a storage system comprising storage nodes, the wear management method comprising:

collecting status information about each of the storage nodes;

establishing a wear progress model with respect to the storage nodes based on the status information; and

controlling a wear acceleration index of each of the storage nodes based on the wear progress model and a wear management policy.

12. The wear management method of claim 11, further comprising:

adjusting a free space ratio of each of the storage nodes to control the wear acceleration index.

13. The wear management method of claim 11, further comprising:

storing data in each of the storage nodes, or deleting the data from each of the storage nodes, to control the wear acceleration index.

14. The wear management method of claim 11, further comprising:

moving data among the storage nodes to control the wear acceleration index.

15. The wear management method of claim 11, wherein the status information comprises an overall capacity, or an amount of valid data, or a distribution of the data, or a wear level of the data, or any combination thereof.

16. The wear management method of claim 11, wherein the wear management policy comprises a policy of equally wearing the storage nodes, or a policy of sequentially wearing a storage node among the storage nodes that comprises a greatest endurance among endurances of the storage nodes, or a policy of completely wearing a storage node among the storage nodes that comprises a least endurance among the endurances of the storage nodes.

17. The wear management method of claim 11, wherein each of the storage nodes comprises a NAND flash memory.

18. The wear management method of claim 11, further comprising if the wear management policy comprises a policy of equally wearing the storage nodes:

controlling the wear acceleration index based on an endurance of each of the storage nodes to wear the storage nodes almost simultaneously.

19. The wear management method of claim 11, further comprising if the wear management policy comprises a policy of sequentially wearing a storage node among the storage nodes that comprises a greatest endurance among endurances of the storage nodes:

controlling the wear acceleration index of the storage node to comprise a greatest wear acceleration index among the wear acceleration index of each of the storage nodes, to wear the storage node the fastest.

20. The wear management method of claim 11, further comprising if the wear management policy comprises a policy of completely wearing a storage node among the storage nodes that comprises a least endurance among the endurances of the storage nodes:

controlling the wear acceleration index of the storage node to comprise a greatest wear acceleration index among the wear acceleration index of each of the storage nodes, to wear the storage node the fastest; and

replacing the storage node with a new storage node when the storage node is completely worn out.