Granted Patent B2

US 12,079,083 · App. 18/175,143 · Granted Sep 3, 2024

Inventors: Ilya Volvovski (Chicago, IL); Bruno H. Cabral (Chicago, IL); Manish Motwani (Chicago, IL); Thomas D. Cocagne (Elk Grove Village, IL); Timothy W. Markison (Mesa, AZ); Gary W. Grube (Barrington Hills, IL); Wesley B. Leggette (Chicago, IL); Jason K. Resch (Warwick, RI); Michael C. Storm (Palo Alto, CA); Greg R. Dhuse (Chicago, IL); Yogesh R. Vedpathak (Chicago, IL); Ravi V. Khadiwala (Bartlett, IL)

Assignee: Pure Storage, Inc.

G06F11/1076G06F3/061G06F3/0635G06F3/0659G06F3/067G06F11/0709G06F11/0727G06F11/0775G06F16/00H04L47/72H04L67/1097H04L67/62G06F9/50G06F9/5005G06F9/5077G06F2211/1004G06F2211/1028H04L47/28

Abstract

Claims (45)

1. A method for execution by at least one processing circuit of a storage network, the method comprises:

sending, to at least one storage unit of the storage network, at least one read request corresponding to at least a read threshold number of a set of encoded data slices to be retrieved, wherein the set of encoded data slices correspond to data that is coded in accordance with dispersed error coding parameters that include a write threshold number and the read threshold number, wherein the write threshold number is a number of encoded data slices in the set of encoded data slices and wherein the read threshold number is a number of the set of encoded data slices that is required to decode the data;

receiving, at the at least one processing circuit and from the at least one storage unit, a first subset of the set of encoded data slices, wherein the first subset is missing at least one missing encoded data slice that was not received from the at least one storage unit in response to the at least one read request and wherein a number of encoded data slices in the first subset is less than the read threshold number;

generating, via the at least one processing circuit, at least one rebuilt encoded data slice corresponding to the at least one missing encoded data slice utilizing locally decodable redundancy data, wherein the locally decodable redundancy data was generated from a second subset of the set of encoded data slices that includes the at least one missing encoded data slice and wherein the locally decodable redundancy data is stored locally to the processing circuit; and

recovering, via the at least one processing circuit, the data based on the at least one rebuilt encoded data slice and the first subset.

2. The method of claim 1 , further comprising:

identifying, via the at least one processing circuit, the at least one missing encoded data slice of the first subset.

3. The method of claim 2 , wherein the at least one missing encoded data slice of the first subset is identified when the at least one missing encoded data slice was not received from the at least one storage unit in response to the at least one read request.

4. The method of claim 1 , wherein the second subset of the set of encoded data slices includes less than the read threshold number of the set of encoded data slices.

5. The method of claim 1 , wherein the at least one missing encoded data slice corresponds to failure of an individual storage device of the at least one storage unit.

6. The method of claim 5 , wherein the individual storage device of the at least one storage unit comprises solid state memory.

7. The method of claim 6 , wherein the individual storage device is a drive that failed.

8. The method of claim 1 , further comprising:

selecting the second subset of the set of encoded data slices to generate the locally decodable redundancy data.

9. A storage network system of a storage network comprises:

at least one processing circuit;

a memory that stores operational instructions, that when executed by the at least one processing circuit cause the storage processing system to perform operations that include:

sending, to at least one storage unit of the storage network, at least one read request corresponding to at least a read threshold number of a set of encoded data slices to be retrieved, wherein the set of encoded data slices correspond to data that is coded in accordance with dispersed error coding parameters that include a write threshold number and the read threshold number, wherein the write threshold number is a number of encoded data slices in the set of encoded data slices and wherein the read threshold number is a number of the set of encoded data slices that is required to decode the data;

receiving, at the at least one processing circuit and from the at least one storage unit, a first subset of the set of encoded data slices, wherein the first subset is missing at least one missing encoded data slice that was not received from the at least one storage unit in response to the at least one read request and wherein a number of encoded data slices in the first subset is less than the read threshold number;

generating, via the at least one processing circuit, at least one rebuilt encoded data slice corresponding to the at least one missing encoded data slice utilizing locally decodable redundancy data, wherein the locally decodable redundancy data was generated from a second subset of the set of encoded data slices that includes the at least one missing encoded data slice and wherein the locally decodable redundancy data is stored locally to the processing circuit; and

recovering, via the at least one processing circuit, the data based on the at least one rebuilt encoded data slice and the first subset.

10. The storage network system of claim 9 , wherein the operations further include:

identifying, via the at least one processing circuit, the at least one missing encoded data slice of the first subset.

11. The storage network system of claim 10 , wherein the at least one missing encoded data slice of the first subset is identified when the at least one missing encoded data slice was not received from the at least one storage unit in response to the at least one read request.

12. The storage network system of claim 9 , wherein the second subset of the set of encoded data slices includes less than the read threshold number of the set of encoded data slices.

13. The storage network system of claim 9 , wherein the at least one missing encoded data slice corresponds to failure of an individual storage device of the at least one storage unit.

14. The storage network system of claim 13 , wherein the individual storage device of the at least one storage unit comprises solid state memory.

15. The storage network system of claim 14 , wherein the individual storage device is a drive that failed.

16. The storage network system of claim 9 , wherein the operations further include:

selecting the second subset of the set of encoded data slices to generate the locally decodable redundancy data.

17. A non-transitory computer readable storage medium comprises:

at least one memory that stores operational instructions that, when executed by a storage network that includes at least one processing circuit and a memory, causes the storage network to perform operations that include:

sending, to at least one storage unit of the storage network, at least one read request corresponding to at least a read threshold number of a set of encoded data slices to be retrieved, wherein the set of encoded data slices correspond to data that is coded in accordance with dispersed error coding parameters that include a write threshold number and the read threshold number, wherein the write threshold number is a number of encoded data slices in the set of encoded data slices and wherein the read threshold number is a number of the set of encoded data slices that is required to decode the data;

receiving, at the at least one processing circuit and from the at least one storage unit, a first subset of the set of encoded data slices, wherein the first subset is missing at least one missing encoded data slice that was not received from the at least one storage unit in response to the at least one read request and wherein a number of encoded data slices in the first subset is less than the read threshold number;

generating, via the at least one processing circuit, at least one rebuilt encoded data slice corresponding to the at least one missing encoded data slice utilizing locally decodable redundancy data, wherein the locally decodable redundancy data was generated from a second subset of the set of encoded data slices that includes the at least one missing encoded data slice and wherein the locally decodable redundancy data is stored locally to the processing circuit; and

recovering, via the at least one processing circuit, the data based on the at least one rebuilt encoded data slice and the first subset.

18. The non-transitory computer readable storage medium of claim 17 , wherein the operations further include:

identifying, via the at least one processing circuit, the at least one missing encoded data slice of the first subset.

19. The non-transitory computer readable storage medium of claim 18 , wherein the at least one missing encoded data slice of the first subset is identified when the at least one missing encoded data slice was not received from the at least one storage unit in response to the at least one read request.

20. The non-transitory computer readable storage medium of claim 17 , wherein the second subset of the set of encoded data slices includes less than the read threshold number of the set of encoded data slices.

21. The non-transitory computer readable storage medium of claim 17 , wherein the at least one missing encoded data slice corresponds to failure of an individual storage device of the at least one storage unit.

22. The non-transitory computer readable storage medium of claim 21 , wherein the individual storage device of the at least one storage unit comprises solid state memory.

23. The non-transitory computer readable storage medium of claim 22 , wherein the individual storage device is a drive that failed.

24. The non-transitory computer readable storage medium of claim 17 , wherein the operations further include:

selecting the second subset of the set of encoded data slices to generate the locally decodable redundancy data.

Assignments (4)

Continuity (16)