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Method for selecting garbage collection target block, and solid state disk

A target block and garbage technology, applied in the storage field, can solve problems such as uneven block wear and only focus on recycling efficiency, and achieve the effects of improving service life, reducing write amplification, and reducing the number of block erasures

Inactive Publication Date: 2018-10-09
SHENZHEN YILIAN INFORMATION SYST CO LTD
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Problems solved by technology

[0004] figure 2 It is the process of selecting the GC target block by the greedy algorithm. When the GC is triggered, the ratio of valid pages to invalid pages of all blocks is obtained, and the block with the most invalid pages is selected as the target block, and the valid data in the target block is migrated and erased accordingly. block recovery, this selection method only focuses on the efficiency of recovery, which will cause uneven block wear

Method used

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  • Method for selecting garbage collection target block, and solid state disk
  • Method for selecting garbage collection target block, and solid state disk
  • Method for selecting garbage collection target block, and solid state disk

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Embodiment Construction

[0018] 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.

[0019] image 3 It is the flow process of the present invention to select the GC target block, select an appropriate block as the GC target block, comprehensively consider the proportion of invalid pages in the block and the number of erasing and writing times, improve GC efficiency, and prolong the life of NAND Flash;

[0020] The present invention comprehensively considers block wear and recovery efficiency, and the formula for calculating the weighted score is a...

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Abstract

The invention discloses a method for selecting a garbage collection target block, and a solid state disk. The method is characterized in that the recovery factor score of each block is calculated according to the proportion and the erasing frequencies of effective pages in each block, and the block with a lowest score is selected as a recovery target block. The effective page ratio and the erasingfrequency weighting score value of each block on the SSD (Solid State Disk) are calculated to comprehensively consider an influence on the read-write performance and the service life of the SSD as far as possible, and the block with a low effective page proportion and few erasing frequencies is selected as the target recovery block of a GC. A wear-leveling thought is used for selecting an optimalblock as a recovery block, block erasing frequencies in the SSD are reduced, data migration frequencies are lowered, write amplification is reduced, and the service life of the SSD is improved.

Description

technical field [0001] The invention relates to the field of storage technology, in particular to a method for selecting a garbage collection target block and a solid-state hard disk. Background technique [0002] Due to the inherent characteristics of NAND flash, erase needs to be performed before the program, and the erase operation is performed in units of blocks. Fragmented pages will be generated during the use of SSDs, and invalid pages need to be recovered through garbage collection. However, the garbage collection mechanism will reduce the performance of the SSD and shorten the life of the SSD. Especially when the SSD is almost full, the garbage collection mechanism GC will be triggered frequently, seriously reducing the performance of the SSD. The current GC mechanism generally uses a greedy algorithm for target block selection, which does not consider the number of erasures of the target block, which may easily cause the target block to be erased prematurely and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/02
CPCG06F12/0246G06F12/0253G06F2212/214
Inventor 肖锐
Owner SHENZHEN YILIAN INFORMATION SYST CO LTD
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