Method and apparatus for facilitating wear leveling of solid state disk

• US 10,372,349 B2
• Filed: 12/22/2016
• Issued: 08/06/2019
• Est. Priority Date: 12/30/2015
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Inventors: Xu, Xinlei, Li, Liam Xiongcheng, Gao, Jian, Yang, Lifeng, Jia, Ruiyong
• Primary Examiner(s): Rossiter, Sean D
• Application Number:
  US15/387,744
• Publication Number:
  US 20170192695A1
• Time in Patent Office: 957 Days
• Field of Search: 711103
• CPC Class Codes: G06F 12/0802 Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
• CPC Class Codes: G06F 2212/60 Details of cache memory
• CPC Class Codes: G06F 3/0616 in relation to life time, e.g. increasing Mean Time Between Failures [MTBF]
• CPC Class Codes: G06F 3/0631 by allocating resources to storage systems
• CPC Class Codes: G06F 3/0644 Management of space entities, e.g. partitions, extents, pools
• CPC Class Codes: G06F 3/0653 Monitoring storage devices or systems
• CPC Class Codes: G06F 3/0673 Single storage device
• CPC Class Codes: G06F 3/0679 Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
• CPC Class Codes: G06F 3/0688 Non-volatile semiconductor memory arrays

Abstract

Embodiments of the present disclosure relate to a method and apparatus for facilitating wear leveling of a solid state disk (SSD). The method comprises obtaining a performance parameter of a SSD device of a plurality of SSD devices in the SSD cache, and the SSD device includes one or more SSD disks. The method further comprises determining a weight for the SSD device based on the performance parameter of the SSD device. The method also comprises setting reserved space for the SSD device according to the weight for the SSD device, and the reserved space is inaccessible in the SSD device.

Claims

1. A method for facilitating wear leveling for a solid state disk (SSD), comprising:

obtaining a performance parameter of a SSD device of a plurality of SSD devices in a SSD cache, the SSD device including one or more SSD disks, wherein the performance parameter is enabled to comprise temperature of the SSD device;

determining a weight for the SSD device based on the performance parameter of the SSD device; and

setting reserved space for the SSD device according to the weight for the SSD device, the reserved space being inaccessible in the SSD device;

wherein setting the reserved space for the SSD device according to the weight for the SSD device comprises at least one of the following;

setting the reserved space greater than a threshold space in response to the weight being above a predetermined threshold, and

setting the reserved space less than the threshold space in response to the weight being below the predetermined threshold; and

wherein

if the reserved space is set to be greater than the threshold space, a writing frequency of the SSD device is set to be less than a threshold frequency, and

if the reserved space is set to be less than the threshold space, the writing frequency of the SSD device is set to be greater than the threshold frequency.

2. The method according to claim 1, wherein the SSD cache uses a cache page to store hot data frequently accessed in a hard disk drive (HDD).

3. The method according to claim 2, wherein the hot data is random data with a size below 64 KB.

4. The method according to claim 1, wherein the obtaining a performance parameter of a SSD device of a plurality of SSD devices in a SSD cache comprises:

periodically obtaining the performance parameter of the SSD device.

5. The method according to claim 4, wherein the determining a weight for the SSD device based on the performance parameter of the SSD device comprises at least one of the following:

configuring analysis of the weight for the SSD device so that the weight increases as the performance parameter increases; and

configuring analysis of the weight for the SSD device so that the weight decreases as the performance parameter decreases.

6. The method according to claim 5, wherein the plurality of SSD devices has a same default weight.

7. The method according to claim 1, wherein the performance parameter further includes at least one of a working current and a wearing ratio.

8. The method according to claim 1, wherein the performance parameter of the SSD device is obtained periodically in response to expiration of a predefined time period;

and

wherein the method further comprises;

detecting that the temperature of another SSD device of the plurality of SSD devices is higher than a predefined temperature threshold, and

in response to detecting that the temperature of the other SSD device is higher than the predefined temperature threshold, obtaining the performance parameter of each SSD of the plurality of SSD devices.

9. An apparatus for facilitating wear leveling for a solid state disk (SSD), comprising:

an obtaining unit configured to obtain a performance parameter of a SSD device of a plurality of SSD devices in a SSD cache, the SSD device including one or more SSD disks, wherein the performance parameter is enabled to comprise temperature of the SSD device;

a determining unit configured to determine a weight for the SSD device based on the performance parameter of the SSD device; and

a setting unit configured to set reserved space for the SSD device according to the weight for the SSD device, the reserved space being inaccessible in the SSD device;

wherein the setting unit is configured to perform at least one of the following;

setting the reserved space greater than a threshold space in response to the weight being above a predetermined threshold, and

setting the reserved space less than the threshold space in response to the weight being below the predetermined threshold, and

wherein

if the reserved space is set to be greater than the threshold space, a writing frequency of the SSD device is set to be less than a threshold frequency, and

if the reserved space is set to be less than the threshold space, the writing frequency of the SSD device is set to be greater than the threshold frequency.

10. The apparatus according to claim 9, wherein the SSD cache uses a cache page to store hot data frequently accessed in a hard disk drive (HDD).

11. The apparatus according to claim 10, wherein the hot data is random data with a size below 64 KB.

12. The apparatus according to claim 9, wherein the obtaining apparatus is further configured to:

periodically obtain the performance parameter of the SSD device.

13. The apparatus according to claim 12, wherein the determining apparatus is configured to perform at least one of the following:

configuring the weight for the SSD device so that the weight increases as the performance parameter increases; and

configuring the weight for the SSD device so that the weight decreases as the performance parameter decreases.

14. The apparatus according to claim 13, wherein the plurality of SSD devices has a same default weight.

15. The apparatus according to claim 9, wherein the performance parameter further includes at least one of a working current and a wearing ratio.

16. The apparatus according to claim 9, wherein the obtaining unit obtains the performance parameter of the SSD device periodically in response to expiration of a predefined time period;

and

wherein the obtaining unit is further configured to;

detect that the temperature of another SSD device of the plurality of SSD devices is higher than a predefined temperature threshold, and

in response to detecting that the temperature of the other SSD device is higher than the predefined temperature threshold, obtain the performance parameter of each SSD of the plurality of SSD devices.

17. The apparatus according to claim 9, wherein the processor obtains the performance parameter of the SSD device periodically in response to expiration of a predefined time period;

and

wherein the processor is further configured to;

detect that the temperature of another SSD device of the plurality of SSD devices is higher than a predefined temperature threshold, and

in response to detecting that the temperature of the other SSD device is higher than the predefined temperature threshold, obtain the performance parameter of each SSD of the plurality of SSD devices.

18. An apparatus for facilitating wear leveling of a solid state disk SSD, comprising:

a memory; and

a processor configured to;

obtain a performance parameter of a SSD device of a plurality of SSD devices in a SSD cache, the SSD device including one or more SSD disks, wherein the performance parameter is enabled to comprise temperature of the SSD device;

determine a weight for the SSD device based on the performance parameter of the SSD device; and

set reserved space for the SSD device according to the weight for the SSD device, the reserved space being inaccessible in the SSD device;

wherein the processor, when setting the reserved space for the SSD device according to the weight for the SSD device, is constructed and arranged to perform at least one of the following;

set the reserved space greater than a threshold space in response to the weight being above a predetermined threshold, and

set the reserved space less than the threshold space in response to the weight being below the predetermined threshold; and

wherein

if the reserved space is set to be greater than the threshold space, a writing frequency of the SSD device is set to be less than a threshold frequency, and

if the reserved space is set to be less than the threshold space, the writing frequency of the SSD device is set to be greater than the threshold frequency.