System and method for recovering solid state drive data

• US 20100125751A1
• Filed: 11/18/2008
• Published: 05/20/2010
• Est. Priority Date: 11/18/2008
• Status: Active Grant

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: McKean, Brian
• Granted Patent: US 8,041,991 B2
• Time in Patent Office: Days
• US Class Current: 714/5
• CPC Class Codes: G06F 11/1662 the resynchronized component or unit being a persistent storage device re-synchronization of failed mirror storage G06F11/2082; rebuild or reconstruction of parity RAID storage G06F11/1008
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data

Abstract

A method for recovering solid state drive (SSD) data may comprise: detecting a failed SSD comprising one or more data blocks; receiving a request to write data to the one or more data blocks of the failed SSD; writing the data to one or more data blocks of an operational drive; and rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive.

A system for recovering solid state drive (SSD) data may comprise: means for detecting a failed SSD comprising one or more data blocks; means for receiving a request to write data to the one or more data blocks of the failed SSD; means for writing the data to one or more data blocks of an operational drive; and means for rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive.

Claims

1. A method for recovering solid state drive (SSD) data comprising:

detecting a failed SSD comprising one or more data blocks;

receiving a request to write data to the one or more data blocks of the failed SSD;

writing the data to one or more data blocks of an operational drive;

rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive.

2. The method of claim 1, wherein the detecting a failed SSD comprising one or more data blocks further comprises:

detecting a failed write directed to one or more data blocks of the SSD.

3. The method of claim 1, wherein the writing the data to one or more data blocks of an operational drive further comprises:

writing the data to one or more data blocks of an operational drive according to a redirect-on-write snapshot methodology.

4. The method of claim 1, wherein the writing the data to one or more data blocks of an operational drive further comprises:

updating one or more look-up tables comprising data block mappings for the failed SSD and an operational SSD.

5. The method of claim 1, wherein the rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive further comprises:

copying one or more data blocks of the failed SSD for which write requests have not been received to a replacement SSD;

copying the one or more data blocks of the operational drive to the replacement SSD.

6. The method of claim 5, wherein the copying the one or more data blocks of the operational drive to the replacement SSD further comprises:

redirecting a read request directed to the one or more data blocks of the operational drive to one or more data blocks of the replacement SSD.

7. A system for recovering solid state drive (SSD) data comprising:

means for detecting a failed SSD comprising one or more data blocks;

means for receiving a request to write data to the one or more data blocks of the failed SSD;

means for writing the data to one or more data blocks of an operational drive;

means for rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive.

8. The system of claim 7, wherein the means for detecting a failed SSD comprising one or more data blocks further comprises:

means for detecting a failed write directed to one or more data blocks of the SSD.

9. The system of claim 7, wherein the means for writing the data to one or more data blocks of an operational drive further comprises:

means for writing the data to one or more data blocks of an operational drive according to a redirect-on-write snapshot methodology.

10. The system of claim 7, wherein the means for writing the data to one or more data blocks of an operational drive further comprises:

means for updating one or more look-up tables comprising data block mappings for the failed SSD and an operational SSD.

11. The system of claim 7, wherein the means for rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive further comprises:

means for copying one or more data blocks of the failed SSD for which write requests have not been received to a replacement SSD;

means for copying the one or more data blocks of the operational drive to the replacement SSD.

12. The system of claim 11, wherein the means for copying the one or more data blocks of the operational drive to the replacement SSD further comprises:

redirecting a read request directed to the one or more data blocks of the operational drive to one or more data blocks of the replacement SSD.

13. A system for recovering solid state drive (SSD) data comprising:

circuitry for detecting a failed SSD comprising one or more data blocks;

circuitry for receiving a request to write data to the one or more data blocks of the failed SSD;

circuitry for writing the data to one or more data blocks of an operational drive;

circuitry for rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive.

14. The system of claim 13, wherein the circuitry for detecting a failed SSD comprising one or more data blocks further comprises:

circuitry for detecting a failed write directed to one or more data blocks of the SSD.

15. The system of claim 13, wherein the circuitry for writing the data to one or more data blocks of an operational drive further comprises:

circuitry for writing the data to one or more data blocks of an operational drive according to a redirect-on-write snapshot methodology

16. The system of claim 13, wherein the circuitry for writing the data to one or more data blocks of an operational drive further comprises:

circuitry for updating one or more look-up tables comprising data block mappings for the failed SSD and an operational SSD.

17. The system of claim 13, wherein the circuitry for rebuilding the failed SSD from the failed SSD and the one or more data blocks of the operational drive further comprises:

circuitry for copying one or more data blocks of the failed SSD for which write requests have not been received to a replacement SSD;

circuitry for copying the one or more data blocks of the operational drive to the replacement SSD.

18. The system of claim 17, wherein the circuitry for copying the one or more data blocks of the operational drive to the replacement SSD further comprises:

redirecting a read request directed to the one or more data blocks of the operational drive to one or more data blocks of the replacement SSD.