Temperature-adjusted power-on data retention time tracking for solid state drives

Patent metadata

Field	Value
Publication number	US-2023030620-A1
Application number	US-202117387092-A
Country	US
Kind code	A1
Filing date	Jul 28, 2021
Priority date	Jul 28, 2021
Publication date	Feb 2, 2023
Grant date	—

Abstract

In general, embodiments of the invention relate tracking the operating temperature of the solid-state memory modules (SSMMs) in order to improve their performance.

First claim

What is claimed is:

1 . A method for managing a solid state memory module, the method comprising: obtaining a temperature reading for the solid state memory module;
determining a counter increment value for a counter, wherein the counter is associated with a block in the solid state memory module, and wherein the counter increment value is determined using the temperature reading; updating a counter value for the counter using the counter increment value to obtain an updated counter value; making a determination that the updated counter value exceeds a threshold; and in response to the determination, performing a preventative operation.

2 . The method of claim 1 , further comprising:
resetting the counter after the preventative operation is performed to a default value.

3 . The method of claim 1 ,
wherein the block comprises data; and wherein the updated counter value is a temperature modified retention time for the block.

4 . The method of claim 3 ,
wherein the threshold is an integrity threshold; and wherein the preventative operation is a garbage collection operation.

5 . The method of claim 1 ,
wherein the block is an erased block; and wherein the updated counter value is a temperature modified erase time for the block.

6 . The method of claim 5 ,
wherein the threshold is an erase bake threshold; and wherein the preventative operation is a re-erase operation.

7 . The method of claim 1 , wherein the threshold is determined using a default temperature and the temperature reading is above or below the default temperature.

8 . The method of claim 1 , wherein the temperature reading is a composition temperature reading derived from two or more separate temperature readings associated with the solid state memory module.

9 . A storage module, comprising:
a storage module controller; a plurality of solid state memory modules; and a plurality of temperature sensors, wherein the storage module controller is configured to:
obtain a composition temperature reading for a solid state memory module of the plurality of solid state memory modules based on plurality of temperature readings from the plurality of temperature sensors;
determine a counter increment value for a counter, wherein the counter is associated with a block in the solid state memory module and wherein the counter increment value is determined using the composite temperature reading;
update a counter value for the counter using the counter increment value to obtain an updated counter value;
make a determination that the updated counter value exceeds a threshold;
in response to the determination, perform a preventative operation; and
reset the counter after the preventative operation is performed.

10 . The storage module of claim 9 ,
wherein the block comprises data; and wherein the updated counter value is a temperature modified retention time for the block.

11 . The storage module of claim 10 ,
wherein the threshold is an integrity threshold; and wherein the preventative operation is a garbage collection operation.

12 . The storage module of claim 9 ,
wherein the block is an erased block; and wherein the updated counter value is a temperature modified erase time for the block.

13 . The storage module of claim 12 ,
wherein the threshold is an erase bake threshold; and wherein the preventative operation is a re-erase operation.

14 . The storage module of claim 9 , wherein the threshold is determined using a default temperature and the composite temperature reading is above or below the default temperature.

15 . A non-transitory computer readable medium comprising computer readable program code to:
obtain a temperature reading for a solid state memory module; determine a counter increment value for a counter, wherein the counter is associated with a block in the solid state memory module and wherein the counter increment value is determined using the temperature reading; update a counter value for the counter using the counter increment value to obtain an updated counter value; make a determination that the updated counter value exceeds a threshold, wherein the threshold is determined using an default temperature and the temperature reading is above the default temperature; and in response to the determination, perform a preventative operation.

16 . The non-transitory computer readable medium of claim 15 , wherein the computer readable program code further:
resets the counter after the preventative operation is performed.

17 . The non-transitory computer readable medium of claim 15 ,
wherein the block comprises data; and wherein the updated counter value is a temperature modified retention time for the block.

18 . The non-transitory computer readable medium of claim 17 ,
wherein the threshold is an integrity threshold; and wherein the preventative operation is a garbage collection operation.

19 . The non-transitory computer readable medium of claim 15 ,
wherein the block is an erased block; and wherein the updated counter value is a temperature modified erase time for the block.

20 . The non-transitory computer readable medium of claim 19 ,
wherein the threshold is an erase bake threshold; and wherein the preventative operation is a re-erase operation.

Assignees

• Dell Products Lp

Inventors

• Lee Frederick K H
• Desai Girish B
• Hudson Samuel
• Proulx Robert J
• Rijo Michael
• Thompson Leland W

Classifications

• G06F1/3275

  Power saving in memory, e.g. RAM, cache · CPC title

• G06F1/3225

  of memory devices · CPC title

• G06F1/3206

  Monitoring of events, devices or parameters that trigger a change in power modality · CPC title

• G06F1/206

  comprising thermal management · CPC title

• G06F2212/7205

  Cleaning, compaction, garbage collection, erase control · CPC title