CN116013398A

CN116013398A - Nand Flash health degree detection method and device and computer equipment

Info

Publication number: CN116013398A
Application number: CN202211680351.2A
Authority: CN
Inventors: 伍旭东; 朱银波; 张少壮
Original assignee: Chengdu Xinyilian Information Technology Co Ltd
Current assignee: Chengdu Xinyilian Information Technology Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-04-25

Abstract

The application relates to a Nand Flash health degree detection method, a Nand Flash health degree detection device, computer equipment and a storage medium, wherein the method comprises the following steps: checking the retection time of all blocks periodically and sequentially through a timer; judging whether the restitution time of the current Block exceeds a threshold value; if the response time of the Block exceeds the threshold value, inquiring the optimal voltage corresponding to the current PE and the current response time; updating the optimal voltage to the corresponding Block, and setting the update flag position as True. According to the invention, by detecting the current time of the last programming distance of the Nand Flash and utilizing the self characteristics of the Nand Flash, the aim of updating the optimal read voltage can be achieved, so that the reliability of the Nand Flash is ensured to the greatest extent, and meanwhile, the additional background data inspection operation is avoided, and the occupation of Die resources is reduced to the greatest extent.

Description

Nand Flash health degree detection method and device and computer equipment

Technical Field

The invention relates to the technical field of solid state disks, in particular to a Nand Flash health degree detection method, a Nand Flash health degree detection device, computer equipment and a storage medium.

Background

SSD (Solid State Drive, solid state Disk) is used as a novel storage medium, NAND particles are used as data storage, and the storage medium is widely applied to various fields such as PCs, notebooks and servers and gradually replaces an HDD (Hard Disk Drive) to become a main application product in the storage field.

Currently, the optimal voltage of many Nand Flash will change stepwise with the current time (recall time) from the last programming, which is also called the early recall problem. For example, the optimal voltage for a particle of a manufacturer is a within x hours after programming; however, beyond x hours, voltage B is the optimal voltage. At this time, if voltage a is applied, a large amount of read retry is caused. That is, the optimal voltage is not unique for the time after programming is completed. In the prior art, some of the prior art schemes do not have background data inspection, and the processing is performed only by online updating of the optimal voltage, so that the processing mode is simple, but the time delay of the SSD is increased.

Disclosure of Invention

Based on the above, it is necessary to provide a Nand Flash health detection method, a Nand Flash health detection device, a Nand Flash health detection computer device and a storage medium.

A Nand Flash health degree detection method comprises the following steps:

checking the retection time of all blocks periodically and sequentially through a timer;

judging whether the restitution time of the current Block exceeds a threshold value;

if the response time of the Block exceeds the threshold value, inquiring the optimal voltage corresponding to the current PE and the current response time;

updating the optimal voltage to the corresponding Block, and setting the update flag position as True.

In one embodiment, the step of periodically checking the repetition time of all blocks in sequence by a timer further includes:

the timer triggers and detects regularly to judge whether the restitution time of the current Block exceeds a threshold value;

if the current Block is not exceeded, the task is jumped out and the next Block is continuously detected.

In one embodiment, after the step of determining whether the restitution time of the current Block exceeds the threshold value, the method further includes:

if the current Block exceeds the threshold value, continuing to judge whether the current Block is a valid Block or not;

if the current task is not a valid Block, the next Block is continuously detected by jumping out of the current task.

In one embodiment, after the step of continuing to determine whether the current Block is a valid Block if the threshold is exceeded, the method further includes:

if the current effective Block is the effective Block, continuously judging whether the current effective Block has triggered the process;

if the process is triggered, the task is jumped out and the next Block is continuously detected;

if the flow is not triggered, searching a table according to the PE value of the Block and the current restination time to obtain the optimal reading voltage, and then refreshing the optimal reading voltage for all pages;

and after the updating is finished, the updating mark position is True.

A Nand Flash health detection device, the Nand Flash health detection device comprising:

the periodic checking module is used for periodically and sequentially checking the restination time of all the blocks through a timer;

the first judging module is used for judging whether the restitution time of the current Block exceeds a threshold value;

the query module is used for querying the optimal voltage corresponding to the current PE and the current response time if the response time of the Block exceeds a threshold value;

and the updating module is used for updating the optimal voltage to the corresponding Block and setting the updating mark position as True.

In one embodiment, the first determining module is further configured to:

In one embodiment, the apparatus further includes a second determining module, where the second determining module is configured to:

In one embodiment, the apparatus further includes a third determining module, where the third determining module is configured to:

and after the updating is finished, the updating mark position is True.

A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any one of the methods described above when the computer program is executed.

A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.

According to the Nand Flash health degree detection method, the Nand Flash health degree detection device, the computer equipment and the storage medium, the states are periodically and sequentially checked through the timer, and the response time of all blocks is checked; judging whether the restitution time of the current Block exceeds a threshold value; if the response time of the Block exceeds the threshold value, inquiring the optimal voltage corresponding to the current PE and the current response time; updating the optimal voltage to the corresponding Block, and setting the update flag position as True. According to the invention, by detecting the current time (the recall time) of the last programming distance of the Nand Flash, the aim of updating the optimal read voltage can be achieved by utilizing the self characteristic of the Nand Flash, so that the reliability of the Nand Flash is ensured to the greatest extent, and meanwhile, the additional background data inspection operation is avoided, and the occupation of Die resources is reduced to the greatest extent.

Drawings

FIG. 1 is a flow chart of a Nand Flash health detection method in one embodiment;

FIG. 2 is a flow chart of a Nand Flash health detection method in another embodiment;

FIG. 3 is a flow chart of a Nand Flash health detection method in yet another embodiment;

FIG. 4 is a flowchart of a Nand Flash health detection method according to another embodiment;

FIG. 5 is a block diagram of a Nand Flash health detection device in one embodiment;

FIG. 6 is a block diagram of a Nand Flash health detection device in another embodiment;

FIG. 7 is a block diagram of a Nand Flash health detection device in yet another embodiment;

fig. 8 is an internal structural diagram of a computer device in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

Currently, the optimal voltage of many Nand Flash will change stepwise with the current time from the last programming, which is also called as early extension problem. For example, the optimal voltage for a particle of a manufacturer is a within x hours after programming; however, beyond x hours, voltage B is the optimal voltage. At this time, if voltage a is applied, a large amount of read retry is caused. That is, the optimal voltage is not unique for the time after programming is completed. In the prior art, some of the prior art schemes do not have background data inspection, and the processing is performed only by online updating of the optimal voltage, so that the processing mode is simple, but the time delay of the SSD is increased.

In the existing processing scheme, nand Flash needs to be read in any mode, so that online voltage update is carried out; although the processing can be performed, the bandwidth of the Die is inevitably occupied, and the processing is competing with the normal host IO. Under the condition of ensuring the safety of SSD data, a patrol mode which does not occupy Die resources as much as possible is needed.

Based on the above, the invention provides a Nand Flash health degree detection method, which aims to avoid additional background data inspection operation and reduce the occupation of Die resources.

In one embodiment, as shown in fig. 1, a Nand Flash health detection method is provided, and the method includes:

step 102, periodically and sequentially checking the restitution time of all blocks through a timer;

step 104, judging whether the restination time of the current Block exceeds a threshold value;

step 106, if the recovery time of the Block exceeds the threshold value, inquiring the optimal voltage corresponding to the current PE and the current recovery time;

step 108, updating the optimal voltage to the corresponding Block, and setting the update flag position as True.

In this embodiment, a Nand Flash health degree detection method is provided, which can detect Nand Flash blocks with risks, and the detection algorithm does not need to issue Nand Flash read commands, and only needs to check the last programming time of the blocks.

First, the reservation times of all blocks are checked periodically and sequentially by a timer. Specifically, the detection can be started from Block0, whether the restitution time of the current Block exceeds a threshold value is judged, if the restitution time of the current Block does not exceed the threshold value, the detection of Block1 is continued, and in order to avoid the excessive occupation of resources by the detection per se, a certain number of blocks are detected at most at a time.

Then, judging whether the restitution time of the current Block exceeds a threshold value; if the Block recovery time exceeds the threshold value, searching the optimal voltage corresponding to the current PE and the current recovery time.

Finally, the optimal voltage is updated to the corresponding Block and the update flag position is True.

In this embodiment, the restitution time of all blocks is checked periodically and sequentially by a timer; judging whether the restitution time of the current Block exceeds a threshold value; if the response time of the Block exceeds the threshold value, inquiring the optimal voltage corresponding to the current PE and the current response time; updating the optimal voltage to the corresponding Block, and setting the update flag position as True. According to the invention, by detecting the current time (the recall time) of the last programming distance of the Nand Flash, the aim of updating the optimal read voltage can be achieved by utilizing the self-characteristics of the Nand Flash, so that the reliability of the Nand Flash is ensured to the greatest extent, and meanwhile, the additional background data inspection operation is avoided, and the occupation of Die resources is reduced to the greatest extent.

In one embodiment, as shown in fig. 2, a Nand Flash health detection method is provided, and the method further includes:

step 202, a timer triggers detection periodically to judge whether the restitution time of the current Block exceeds a threshold value;

step 204, if not, jumping out of the task to continue to detect the next Block;

step 206, if the current Block exceeds the threshold value, continuing to judge whether the current Block is a valid Block or not;

step 208, if not the valid Block, the task is skipped to continue detecting the next Block.

In one embodiment, as shown in fig. 3, a Nand Flash health detection method is provided,

the method further comprises 5 steps after continuing to judge whether the current Block is a valid Block if the threshold is exceeded:

step 302, if the current effective Block is the effective Block, continuing to judge whether the current effective Block has triggered the flow process;

step 304, if the present process is triggered, the task is jumped out to continue to detect the next Block;

step 306, if the flow is not triggered, searching a table according to the PE value of the Block and the current recovery time 0 to obtain an optimal read voltage, and then refreshing the optimal read voltage for all pages;

and 308, after the updating is finished, setting the updating mark position as True.

In one embodiment, referring to fig. 4, a built-in data inspection algorithm is provided to perform health inspection on full-disc data in the background, and the algorithm does not need to issue Nand Flash read command, but only needs to

The last programming time can obtain the checking result, and make corresponding strategies to ensure the reliability of the enterprise-level SSD requirement 5, and the specific implementation process is as follows:

before leaving the factory, the optimal read voltage of each PE in each period of time in the life cycle of the Nand is obtained by means of accelerated aging, big data statistics and the like.

After leaving the factory, the health degree detection checks the recovery time of the Block by background timing, and obtains the time

And detecting whether the longest Block exceeds a threshold value, and processing the data exceeding the threshold. The method comprises the following steps: 0 1. The timer triggers detection periodically, detection is started from Block0, whether the restitution time of the current Block exceeds a threshold value is judged, and if the restitution time of the current Block exceeds the threshold value, the detection of Block1 is continued, and in order to avoid excessive occupation of resources by the detection per se, at most x blocks are detected at a time; if the threshold is exceeded, step 2 is performed.

2. Judging the current Block state, if not, jumping out of the task, continuing to detect the next Block, otherwise, executing the step 3.

5 3. Judging whether the current effective Block has triggered the process flow, if so, jumping out of the task,

and continuing to detect the next Block, otherwise, executing the step 4.

4. And looking up a table according to the PE value of the Block and the current restination time to obtain the optimal read voltage, and then refreshing the optimal read voltage for all pages.

5. After the update is completed, the updated flag position is TRUE.

In this embodiment, the Nand Flash Block with risk can be detected, and the detection method does not need to issue a Nand Flash read command, and only needs to check the last programming time of the Block. In addition, the read voltage of the risk Block can be updated, unnecessary Nand read detection is reduced, and the influence of background processing on performance can be effectively avoided.

It should be understood that, although the steps in the flowcharts of fig. 1-4 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1-4 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily occur sequentially, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or steps.

In one embodiment, as shown in fig. 5, there is provided a Nand Flash health detection apparatus 500, the apparatus comprising:

a periodic checking module 501, configured to periodically check the restitution time of all blocks in sequence through a timer;

a first determining module 502, configured to determine whether a restitution time of a current Block exceeds a threshold;

a query module 503, configured to query an optimal voltage corresponding to a current PE and a current response time if the response time of the Block exceeds a threshold;

and an updating module 504, configured to update the optimal voltage to a corresponding Block, and set an update flag to True.

In one embodiment, the first determining module 502 is further configured to:

In one embodiment, as shown in fig. 6, there is provided a Nand Flash health detection apparatus 500, which further includes a second judging module 505, where the second judging module is configured to:

In one embodiment, as shown in fig. 7, there is provided a Nand Flash health detection apparatus 500, which further includes a third judging module 506, where the third judging module is configured to:

and after the updating is finished, the updating mark position is True.

For specific limitation of the Nand Flash health detection device, reference may be made to the limitation of the Nand Flash health detection method hereinabove, and no further description is given here.

In one embodiment, a computer device is provided, the internal structure of which may be as shown in FIG. 8. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by the processor, implements a Nand Flash health detection method.

It will be appreciated by those skilled in the art that the structure shown in fig. 8 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided that includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the method embodiments above when executing the computer program.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the above method embodiments.

Those skilled in the art will appreciate that implementing all or part of the above described embodiment methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. A Nand Flash health degree detection method comprises the following steps:

2. The Nand Flash health detection method of claim 1, wherein the step of periodically checking the restitution time of all blocks in sequence by a timer further comprises:

3. The Nand Flash health detection method of claim 2, wherein after the step of determining whether the restitution time of the current Block exceeds a threshold value, further comprising:

4. The Nand Flash health detection method of claim 3, further comprising, after the step of continuing to determine whether the current Block is a valid Block if the threshold is exceeded:

and after the updating is finished, the updating mark position is True.

5. The Nand Flash health degree detection device is characterized by comprising:

6. The Nand Flash health detection device of claim 5, wherein the first determination module is further configured to:

7. The Nand Flash health detection device of claim 6, further comprising a second determination module configured to:

8. The Nand Flash health detection device of claim 7, further comprising a third determination module configured to:

and after the updating is finished, the updating mark position is True.

9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 4 when the computer program is executed.

10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 4.