Abrasion balancing method for TLC-type SSDs and SSD

A type of wear leveling technology, which is applied in the field of SSD and wear leveling, can solve the problems of increasing the number of internal data migrations in SLC, increasing the cost of SLC garbage collection and the degree of wear, etc., achieving the effect of more rewritable times and high read and write performance

Inactive Publication Date: 2018-07-06
SHENZHEN YILIAN INFORMATION SYST CO LTD
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Problems solved by technology

On the one hand, the existing TLCSSD can extend the time that hot data stays in the SLC and improve the performance of the initial stage of SSD use; on the other hand, th

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  • Abrasion balancing method for TLC-type SSDs and SSD
  • Abrasion balancing method for TLC-type SSDs and SSD
  • Abrasion balancing method for TLC-type SSDs and SSD

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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0028] SSD converts part of TLC type storage area into SLC type storage area. SSD is divided into TLC area and SLC area. The data in each area is balanced through the data distribution mechanism. The data distribution mechanism is mainly composed of wear leveling control module (wareleveling control) and hot and cold data. The wear leveling control module includes wear leveling in the SLC area, wear leveling in the TLC area, and wear leveling between areas. The wear...

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Abstract

The invention discloses an abrasion balancing method for TLC-type SSDs and an SSD. The abrasion balancing method is characterized by comprising abrasion balancing in an SLC area, abrasion balancing ina TLC area and abrasion balancing between the areas, wherein the abrasion balancing in the SLC area is taking the SLC area as a circular queue; the abrasion balancing in the TLC area is carrying outstatistical analysis on an erasing frequency of each block and selecting the blocks with low erasing frequencies for storing data; the abrasion balancing between the areas is dividing data in the SLCinto cold data and hot data according to a hot data recognition threshold value, migrating the cold data from the SLC area to the TLC area; and the hot data recognition threshold value is dynamicallydetermined according to an abrasion speed. The advantages of being high in reading/writing performance and high in erasing frequency of the SLC are utilized to store the hot data, the large-capacity TLC is utilized to store the cold data, so that compromise of cost, capacity, life and performance is achieved. Through dynamically adjusting the hot data recognition threshold value, the probability of writing the cold data into the SLC and writing the hot data into the TLC is reduced, so that the size of data migrated from the SLC to the TLC is reduced.

Description

technical field [0001] The invention relates to a solid state hard disk control technology, in particular to a wear leveling method for a TLC type SSD and the SSD. Background technique [0002] At present, as solid state disk SSD (solid state disk) shows better characteristics than traditional mechanical hard disk, SSD has the advantages of high read and write performance, low power consumption, small size, etc., and has gradually replaced mechanical hard disk in many fields. [0003] With the development of NAND flash technology, SSD has changed from using SLC (single level cell) to using TLC (triple level cell). If only all the blocks in the TLC granule are used as TLC, it will cause the disadvantages of relatively high cost and short life of the SSD. It has become a trend to convert some blocks in the TLC granule into SLC and some into TLC. Since the erasing and writing life of each block of the TLC type is limited, in order to improve its overall service life, wear leve...

Claims

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Application Information

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IPC IPC(8): G06F3/06
CPCG06F3/061G06F3/0638G06F3/0676
Inventor 肖锐
Owner SHENZHEN YILIAN INFORMATION SYST CO LTD
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