Granted Patent B2

US 11,360,675 · App. 17/085,191 · Granted Jun 14, 2022

Inventors: Jibing Dong (Beijing, CN); Geng Han (Beijing, CN); Vamsi Vankamamidi (Hopkinton, MA); Jian Gao (Beijing, CN)

Assignee: EMC IP Holding Company LLC

G06F3/0619G06F3/067G06F3/0644G06F3/0653G06F3/0659G06F3/0683

Abstract

Claims (32)

1. A method for improving rebuild in a storage system, the method comprising: comparing a generation number of a physical layer block (PLB) with a generation number of a partition 5 corresponding to the PLB; and rebuilding data in the PLB based on the comparison.

2. The method of claim 1 , wherein rebuilding data in the PLB based on the comparison comprises:

rebuilding data in the PLB when the generation number of the PLB is equal to a generation number of the partition corresponding to the PLB.

3. The method of claim 1 , further comprising:

receiving a write request pertaining to the PLB when a storage device corresponding to the PLB is unavailable;

obtaining the generation number of the partition corresponding to the PLB; and

setting the generation number of the PLB to the generation number of the partition corresponding to the PLB.

4. The method of claim 3 , further comprising:

storing the generation number of the PLB to a PLB descriptor.

5. The method of claim 3 , further comprising:

setting an indicator that data in the PLB is invalid.

6. The method of claim 3 , wherein comparing the generation number of the PLB with the generation number of the partition corresponding to the PLB comprises:

comparing the generation number of the PLB stored in the PLB descriptor to the generation number of the partition.

7. The method of claim 1 , further comprising:

completing a rebuild cycle of the partition corresponding to the PLB; and

incrementing the generation number of the partition.

8. A system for improving rebuild in a storage system, the system including a processor configured to: compare a generation number of a physical layer block (PLB) with a generation number of a partition corresponding to the PLB; and rebuild data in the PLB based on the comparison.

9. The system of claim 8 , wherein the processor is further configured to:

rebuild data in the PLB when the generation number of the PLB is equal to a generation number of the partition corresponding to the PLB.

10. The system of claim 8 , wherein the processor is further configured to:

receive a write request pertaining to the PLB when a storage device corresponding to the PLB is unavailable;

obtain the generation number of the partition corresponding to the PLB; and

set the generation number of the PLB to the generation number of the partition corresponding to the PLB.

11. The system of claim 10 , wherein the processor is further configured to:

store the generation number of the PLB to a PLB descriptor.

12. The system of claim 10 , wherein the processor is further configured to:

set an indicator that data in the PLB is invalid.

13. The system of claim 10 , wherein the processor is further configured to:

compare the generation number of the PLB stored in the PLB descriptor to the generation number of the partition.

14. The system of claim 8 , wherein the processor is further configured to:

completing a rebuild cycle of the partition corresponding to the PLB; and

incrementing the generation number of the partition.

Assignments (9)