IP Library › Granted Patent US 12,253,941
Granted Patent B2
US 12,253,941 · App. 18/458,294 · Granted Mar 18, 2025

Management of repeatedly seen data

Inventor: John D. Davis (San Francisco, CA)
Assignee: PURE STORAGE, INC.
G06F12/0261G06F3/0616G06F3/0641G06F3/0652G06F3/0679G06F12/0246G06F12/0253G06F16/1748G06F3/0608G06F2212/1036G06F2212/7205G06F2212/7207G06F2212/7211
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Quick Facts
Patent No.
US 12,253,941
App. No.
18/458,294
Granted
Mar 18, 2025
Kind
B2
Abstract

A method for extending data lifetime for reference in deduplication is provided. The method includes determining that a quantity of user data has at least a threshold amount of data that is re-created in a storage system. The method includes protecting at least portions of the quantity of user data from erasure by garbage collection in the storage system during a predetermined time interval, wherein the protected at least portions are available for data deduplication of further user data in the storage system during the predetermined time interval.

Claims (42)

1. A method, comprising:

protecting, by a processing device of a storage controller through deletion immunity, repeatedly seen data from deletion by garbage collection, the repeatedly seen data having a status as being unreferenced in a storage system, wherein the deletion immunity keeps one or more unreferenced portions of the repeatedly seen data available to be reference data for deduplication;

setting an amount of time that the repeatedly seen data is protected by the deletion immunity, wherein the amount of time is based on a frequency of repetition of the repeatedly seen data; and

performing garbage collection except where the deletion immunity prevents the deletion of the one or more unreferenced portions of the repeatedly seen data during the garbage collection.

2. The method of claim 1 , further comprising:

indicating in metadata that the one or more unreferenced portions of the repeatedly seen data associated with memory to be reclaimed by the garbage collection are to have deletion immunity.

3. The method of claim 1 , further comprising:

analyzing a data structure tracking amounts of repeated data in content stored in a storage system and a frequency of repetition of the repeated data over time to identify the repeatedly seen data.

4. The method of claim 1 , further comprising:

adjusting a determined time interval for maintaining the deletion immunity based on tracking how often the repeatedly seen data is repeatedly seen.

5. The method of claim 1 , further comprising:

performing garbage collection except where a fingerprint corresponds to one or more portions of the repeatedly seen data having deletion immunity according to metadata associated with the one or more portions of the repeatedly seen data.

6. The method of claim 1 , further comprising:

indicating in metadata that one or more portions of the repeatedly seen data associated with memory to be reclaimed by the garbage collection are to have deletion immunity responsive to tracking how often incoming data is repeatedly seen.

7. A non-transitory computer readable storage medium storing instructions which, when executed, cause a processor to:

protect, through deletion immunity, repeatedly seen data from deletion by garbage collection, the repeatedly seen data having a status as being unreferenced in a storage system, wherein the deletion immunity keeps one or more unreferenced portions of the repeatedly seen data available to be reference data for deduplication;

setting an amount of time that the repeatedly seen data is protected by the deletion immunity, wherein the amount of time is based on a frequency of repetition of the repeatedly seen data; and

perform garbage collection except where the deletion immunity prevents the deletion of the one or more unreferenced portions of the repeatedly seen data during the garbage collection.

8. The non-transitory computer readable storage medium of claim 7 , wherein the processor is further to:

indicate in metadata that the one or more unreferenced portions of the repeatedly seen data associated with memory to be reclaimed by the garbage collection are to have deletion immunity.

9. The non-transitory computer readable storage medium of claim 7 , wherein the processor is further to:

analyze a data structure tracking amounts of repeated data in content stored in a storage system and a frequency of repetition of the repeated data over time to identify the repeatedly seen data.

10. The non-transitory computer readable storage medium of claim 7 , wherein the processor is further to:

adjust a determined time interval for maintaining the deletion immunity based on tracking how often the repeatedly seen data is repeatedly seen.

11. The non-transitory computer readable storage medium of claim 7 , wherein processor is further to:

perform garbage collection except where a fingerprint corresponds to one or more portions of the repeatedly seen data having deletion immunity according to metadata associated with the one or more portions of the repeatedly seen data.

12. A storage system, comprising:

storage memory; and

at least one processor of the storage system, configured to:

protect, through deletion immunity, repeatedly seen data from deletion by garbage collection, the repeatedly seen data having a status as being unreferenced in the storage system, wherein the deletion immunity keeps one or more unreferenced portions of the repeatedly seen data available to be reference data for deduplication;

setting an amount of time that the repeatedly seen data is protected by the deletion immunity, wherein the amount of time is based on a frequency of repetition of the repeatedly seen data; and

perform garbage collection except where the deletion immunity prevents the deletion of the one or more unreferenced portions of the repeatedly seen data during the garbage collection.

13. The storage system of claim 12 , wherein the at least one processor is further configured to:

indicate in metadata that the repeatedly seen data associated with the storage memory to be reclaimed are to have deletion immunity.

14. The storage system of claim 12 , wherein the at least one processor is further configured to:

analyze a data structure tracking amounts of repeated data in content stored in a storage system and a frequency of repetition of the repeated data over time to identify the repeatedly seen data.

15. The storage system of claim 12 , wherein the at least one processor is further configured to:

perform in-line deduplication on data arriving for storage in the storage memory using at least a portion of the repeatedly seen data protected by the deletion immunity.

16. The storage system of claim 12 , wherein the at least one processor is further configured to:

perform post-process deduplication on data stored in the storage memory using at least a portion of the repeatedly seen data protected by the deletion immunity.

17. The storage system of claim 12 , wherein the at least one processor is further configured to:

perform a hash function on data arriving for storage in the storage memory or data stored in the storage memory, for utilization of identifying the data as having at least a threshold amount of repeatedly seen data.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 30, 2023
From: DAVIS, JOHN D
To: PURE STORAGE, INC.
Reel/Frame 064751/0706 →
Continuity (4)
Continuation 17106810 · Nov 30, 2020
Continuation 15947307 · Apr 6, 2018
Continuation 14670288 · Mar 26, 2015
Related Publication 20230401150A1 · Dec 14, 2023
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