Method and apparatus for facilitating wear leveling of solid state disk

Patent metadata

Field	Value
Publication number	US-2017192695-A1
Application number	US-201615387744-A
Country	US
Kind code	A1
Filing date	Dec 22, 2016
Priority date	Dec 30, 2015
Publication date	Jul 6, 2017
Grant date	—

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.

First claim

What is claimed is:

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; 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.

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 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.

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 includes at least one of a temperature, a working current and a wearing ratio.

8 . The method according to claim 1 , wherein the setting 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 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.

9 . The method according to claim 8 , 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 . 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; 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.

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

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

13 . The apparatus according to claim 10 , wherein the obtaining apparatus is further configured to:
periodically obtain the performance parameter of the SSD device.

14 . The apparatus according to claim 13 , 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.

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

16 . The apparatus according to claim 10 , wherein the performance parameter includes at least one of a temperature, a working current and a wearing ratio.

17 . The apparatus according to claim 10 , wherein the setting unit is configured to perform at least one of the following:
setting the reserved space greater than 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.

18 . The apparatus according to claim 17 , 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.

19 . 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;
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.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Xu Xinlei
• Li Liam Xiongcheng
• Gao Jian
• Yang Lifeng
• Jia Ruiyong

Classifications

• G06F12/0802

  Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches · CPC title

• G06F3/0631

  by allocating resources to storage systems · CPC title

• G06F3/0679

  Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP] · CPC title

• G06F3/0688

  Non-volatile semiconductor memory arrays · CPC title

• G06F3/0644

  Management of space entities, e.g. partitions, extents, pools · CPC title