DETERMINING ADJUSTMENTS TO THE SPARE SPACE IN A STORAGE DEVICE UNAVAILABLE TO A USER BASED ON A CURRENT CONSUMPTION PROFILE OF A STORAGE DEVICE

• US 20160162205A1
• Filed: 12/09/2014
• Published: 06/09/2016
• Est. Priority Date: 12/09/2014
• Status: Active Grant

• Current Assignee: SK Hynix NAND Product Solutions Corporation (SK Hynix Inc.)
• Original Assignee: Intel Corporation
• Inventors: Grimsrud, Knut S.
• Granted Patent: US 9,678,677 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 2212/1044 Space efficiency improvement
• CPC Class Codes: G06F 2212/7205 Cleaning, compaction, garbage collection, erase control
• CPC Class Codes: G06F 3/0616 in relation to life time, e.g. increasing Mean Time Between Failures [MTBF]
• CPC Class Codes: G06F 3/064 Management of blocks
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]

Abstract

Provided are a computer program product, system and method for determining adjustments to the spare space in a storage device unavailable to a user based on a current consumption profile of a storage device. A current write amplification is based on storage writes to a media at a storage device and host writes from a host to the storage device. An adjustment to the current write amplification is determined to produce an adjusted write amplification based on an estimated lifespan of the storage device, a maximum storage writes for the storage device, and the storage writes at the storage device since the storage device was powered-on. A determination is made to an adjustment to spare space based on the adjusted write amplification. The spare space and the free space available to the user are reconfigured to adjust the spare space by the determined adjustment to the spare space.

Claims

1. A computer program product comprising a computer storage medium having program instructions that when executed manage spare space in a storage device by performing operations, the operations, comprising:

determining a current write amplification based on storage writes to a media at the storage device and host writes from a host to the storage device;

determining an adjustment to the current write amplification to produce an adjusted write amplification based on an estimated lifespan of the storage device, a maximum storage writes for the storage device, and the storage writes at the storage device since the storage device was powered-on;

determining an adjustment to the spare space based on the adjusted write amplification, wherein the spare space comprises overprovisioned storage space not comprising user accessible storage; and

initiating an operation to reconfigure the spare space and the free space available to the user to adjust the spare space by the determined adjustment to the spare space.

2. The computer program product of claim 1, wherein the determining the adjustment to the write amplification comprises:

determining a remaining storage write rate as a function of the maximum storage writes less the storage writes and a remaining duration comprising the estimated lifespan less a powered-on duration of the storage device; and

determining a current storage write rate as a function of the storages writes and the powered-on duration, wherein the adjustment to the write amplification is determined from the remaining storage write rate and the current storage write rate.

3. The computer program product of claim 2, wherein the determining the adjustment to the write amplification from the remaining storage write rate and the current storage write rate comprises determining an adjustment factor that when applied to the current storage write rate results in the remaining storage write rate.

4. The computer program product of claim 3, wherein when the adjustment factor indicates an increase to the current storage write rate, the determined adjustment indicates an increase to the current write amplification, which results to a decrease in the spare space, and wherein when the adjustment factor indicates a decrease to the current write rate, the determined adjustment indicates a decrease to the current write amplification, which results to an increase in the spare space.

5. The computer program product of claim 1, wherein the determined adjustment to the spare space results from a write amplification function of spare space to write amplification applied to the adjusted write amplification.

6. The computer program product of claim 5, wherein the operations further comprise:

determining one of a plurality of write amplification functions provided for different workloads at the storage device based on a current workload at the storage device, wherein the determined write amplification function is applied to the adjusted write amplification.

7. The computer program product of claim 5, wherein the operations further comprise:

applying the adjustment factor to the write amplification according to the write amplification function and a current spare space usage at the storage device to obtain an adjusted write amplification; and

determining a target spare space corresponding according to the write amplification function and the adjusted write amplification.

8. The computer program product of claim 1, wherein the computer readable storage medium is implemented in a host system in communication with the storage device, wherein the program instructions are executed in the host system, wherein the operations further comprise:

sending a request to the storage device for information on the storage writes at the storage device;

receiving from the storage device the information on the storage writes, wherein the received information is used to determine the current write amplification, and wherein the initiating the operation to reconfigure the spare space comprises sending to the storage device a command to adjust the spare space by the determined adjustment to the spare space to adjust the amount of the spare space provisioned in the storage device.

9. The computer program product of claim 8, wherein the operations further comprise:

rendering in a user interface information on the determined adjustment to the spare space with a graphical element to enable an operator at the user interface to indicate to accept the determined adjustment to the spare space; and

receiving indication of selection of the graphical element to accept the determined adjustment to the spare space, wherein the command to adjust the spare space is sent to the storage device in response to receiving the indication of the selection of the graphical element to accept the determined adjustment.

10. The computer program product of claim 1, wherein the computer readable storage medium is implemented in a controller of the storage device, enclosed within the storage device, wherein the program instructions are executed in the controller.

11. The computer program product of claim 1, wherein a host system is in communication with the storage device, and wherein the operations further comprise:

sending by the host system a resize command to the storage device having as a parameter the adjustment to the spare space; and

processing, by the storage device, the resize command to reconfigure the spare space and the free space available to the user to adjust the spare space by the adjustment to the spare space in the parameter of the resize command.

12. The computer program product of claim 1, wherein the storage device comprises a solid state storage device having NAND memory cells, wherein the spare space is used to perform garbage collection to consolidate pages of active data in blocks in the NAND memory cells having unused pages into fewer blocks.

13. A storage device in communication with a host system, comprising:

a storage array comprising a storage media; and

a controller executing logic to perform operations, the operations comprising;

determining a current write amplification based on storage writes to a media at the storage device and host writes from a host to the storage device;

determining an adjustment to the current write amplification to produce an adjusted write amplification based on an estimated lifespan of the storage device, a maximum storage writes for the storage device, and the storage writes at the storage device since the storage device was powered-on;

a

determining an adjustment to spare space based on the adjusted write amplification, wherein the spare space comprises overprovisioned storage space not comprising user accessible storage; and

reconfiguring the spare space and the free space available to the user to adjust the spare space by the determined adjustment to the spare space.

14. The storage device of claim 13, wherein the determining the adjustment to the write amplification comprises:

determining a remaining storage write rate as a function of the maximum storage writes less the storage writes and a remaining duration comprising the estimated lifespan less a powered-on duration of the storage device; and

determining a current storage write rate as a function of the storages writes and the powered-on duration, wherein the adjustment to the write amplification is determined from the remaining storage write rate and the current storage write rate.

15. The storage device of claim 13, wherein the determined adjustment to the spare space results from a write amplification function of spare space to write amplification applied to the adjusted write amplification.

16. The storage device of claim 13, wherein the operations further comprise:

reconfiguring the spare space and the free space available to the user to adjust the spare space by the determined adjustment to the spare space.

17. A system in communication with a storage device, comprising:

a processor; and

a computer readable storage medium having computer program code executed by the processor to perform operations, the operations comprising;

determining a current write amplification based on storage writes to a media at the storage device and host writes from a host to the storage device;

determining an adjustment to the current write amplification to produce an adjusted write amplification based on an estimated lifespan of the storage device, a maximum storage writes for the storage device, and the storage writes at the storage device since the storage device was powered-on;

determining an adjustment to spare space based on the adjusted write amplification, wherein the spare space comprises overprovisioned storage space not comprising user accessible storage; and

sending to the storage device a command to reconfiguring the spare space and the free space available to the user to adjust the spare space by the determined adjustment to the spare space.

18. The system of claim 17, wherein the operations further comprise:

sending a request to the storage device for information on the storage writes at the storage device; and

receiving from the storage device the information on the storage writes, wherein the received information is used to determine the current write amplification.

19. The system of claim 17, wherein the operations further comprise:

rendering in a user interface information on the determined adjustment to the spare space with a graphical element to enable an operator at the user interface to indicate to accept the determined adjustment to the spare space; and

receiving indication of selection of the graphical element to accept the determined adjustment to the spare space, wherein the command to adjust the spare space is sent to the storage device in response to receiving the indication of the selection of the graphical element to accept the determined adjustment.

20. The system of claim 17, wherein the sending the command comprises:

sending a resize command to the storage device having as a parameter the adjustment to the spare space, wherein the resize command causes the storage device to reconfigure the spare space and the free space available to the user to adjust the spare space by the adjustment to the spare space in the parameter of the resize command.

21. A method, comprising:

determining a current write amplification based on storage writes to a media at a storage device and host writes from a host to the storage device;

determining an adjustment to the current write amplification to produce an adjusted write amplification based on an estimated lifespan of the storage device, a maximum storage writes for the storage device, and the storage writes at the storage device since the storage device was powered-on;

determining an adjustment to spare space based on the adjusted write amplification, wherein the spare space comprises overprovisioned storage space not comprising user accessible storage; and

initiating an operation to reconfigure the spare space and the free space available to the user to adjust the spare space by the determined adjustment to the spare space.

22. The method of claim 21, wherein the determining the adjustment to the write amplification comprises:

determining a remaining storage write rate as a function of the maximum storage writes less the storage writes and a remaining duration comprising the estimated lifespan less a powered-on duration of the storage device; and

determining a current storage write rate as a function of the storages writes and the powered-on duration, wherein the adjustment to the write amplification is determined from the remaining storage write rate and the current storage write rate.

23. The method of claim 22, wherein the determining the adjustment to the write amplification from the remaining storage write rate and the current storage write rate comprises determining an adjustment factor that when applied to the current storage write rate results in the remaining storage write rate.

24. The method of claim 23, wherein when the adjustment factor indicates an increase to the current storage write rate, the determined adjustment indicates an increase to the current write amplification, which results to a decrease in the spare space, and wherein when the adjustment factor indicates a decrease to the current write rate, the determined adjustment indicates a decrease to the current write amplification, which results to an increase in the spare space.

25. The method of claim 21, wherein the determined adjustment to the spare space results from a write amplification function of spare space to write amplification applied to the adjusted write amplification.