Non-volatile memory system having an increased effective number of supported heat levels

• US 10,078,582 B2
• Filed: 12/10/2014
• Issued: 09/18/2018
• Est. Priority Date: 12/10/2014
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Camp, Charles J., Fisher, Timothy J., Fry, Aaron D., Ioannou, Nikolas, Koltsidas, Ioannis, Pletka, Roman, Tomic, Sasa
• Primary Examiner(s): Sain, Gautam
• Application Number:
  US14/566,639
• Publication Number:
  US 20160170870A1
• Time in Patent Office: 1,378 Days
• Field of Search: 711103
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/452 Instruction code
• 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

Abstract

A method, according to one embodiment, includes assigning data having a first heat to a first data stream, assigning data having a second heat to a second data stream, and writing the data streams in parallel to page-stripes having a same index across a series of planes of memory. Other systems, methods, and computer program products are described in additional embodiments.

Claims

1. A computer-implemented method, comprising:

assigning data having a first heat to a first data stream;

assigning data having a second heat to a second data stream; and

writing the data streams simultaneously, in parallel, to page-stripes having a same index across a series of planes of memory,

wherein the writing of the first data stream begins at an opposite end of the series of planes as the writing of the second data stream, the writing of the streams being toward one another.

2. The computer-implemented method of claim 1, wherein a junction is defined in one of the page-stripes of a plane from the series of planes where the data of the first and second data streams meet.

3. The computer-implemented method of claim 2, wherein the plane in which the first and second data streams meet is dependent upon a rate at which the data of the first data stream is updated and a rate at which the data of the second data stream is updated.

4. The computer-implemented method of claim 1, wherein a rate at which the data of the first data stream is updated is more similar to a rate at which the data of the second data stream is updated than a rate at which data having a third heat is updated.

5. The computer-implemented method of claim 1, wherein the memory is in a write cache.

6. The computer-implemented method of claim 1, wherein the memory is non-volatile memory.

7. The computer-implemented method of claim 1, wherein the first and second heats correspond to a rate at which the respective data is updated in the memory.

8. A system, comprising:

a memory; and

a controller configured to assign data having a first heat to a first data stream, assign data having a second heat to a second data stream, and write the data streams simultaneously, in parallel, to page-stripes having a same index across a series of planes of the memory,

wherein the writing of the first data stream begins at an opposite end of the series of planes as the writing of the second data stream, the writing of the streams being toward one another.

9. The system of claim 8, wherein a junction is defined in one of the page-stripes of a plane from the series of planes where the data of the first and second data streams meet.

10. The system of claim 9, wherein the plane in which the first and second data streams meet is dependent upon a rate at which the data of the first data stream is updated and a rate at which the data of the second data stream is updated.

11. The system of claim 8, wherein a rate at which the data of the first data stream is updated is more similar to a rate at which the data of the second data stream is updated than a rate at which data having a third heat is updated.

12. The system of claim 8, wherein the memory is in a write cache.

13. The system of claim 8, wherein the memory is non-volatile memory.

14. The system of claim 8, wherein the first and second heats correspond to a rate at which the respective data is updated in the memory.

15. A computer program product comprising a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se, the program instructions readable and/or executable by a controller to cause the controller to:

assign, by the controller, data having a first heat to a first data stream;

assign, by the controller, data having a second heat to a second data stream; and

write, by the controller, the data streams simultaneously, in parallel, to page-stripes having a same index across a series of planes of memory,

wherein the writing of each data stream begins at a starting position between ends of the series of planes, wherein each data stream is written from the starting position toward a respective end of the series of planes.

16. The computer program product of claim 15, wherein the starting position is advanced after at least some writing is performed.

17. The computer program product of claim 15, wherein the first and second heats correspond to a rate at which the respective data is updated in the memory.

18. The computer program product of claim 15, wherein a junction is defined in one of the page-stripes of a plane from the series of planes where the data of the first and second data streams meet.

19. The computer program product of claim 18, wherein the plane in which the first and second data streams meet is dependent upon a rate at which the data of the first data stream is updated and a rate at which the data of the second data stream is updated.

20. The computer program product of claim 19, wherein the starting position is advanced incrementally across the series of planes after at least some writing is performed, wherein the starting position is skipped over certain planes of the series of planes based on preventing additional wear to the certain planes.