A method to improve the service life of SSD based on life balance wl multithreading

Abstract

The invention discloses a method for prolonging the SSD service life based on WL multithreads. The method is characterized in that a service life balancing finite-state machine is added in an SSD firmware and used for responding to read-write commands from a host-side, and data blocks are divided into cold data, heat data and routine data according to the access frequency attributes of the operated data blocks included in the read-write commands; a heat data processing thread, a cold data processing thread and a routine data processing thread are simultaneously set in the SSD firmware and are all coordinated, triggered and executed by the service life balancing finite-state machine in a unified mode, and final read-write operations of the host-side are completed. The read-write operations of the cold data, the heat data and the routine data are respectively achieved by adding the service life balancing finite-state machine and designing the multithreads based on the service life balancing finite-state machine, NVMe SSD write amplification is effectively reduced, and meanwhile the NAND flash erase times are efficiently balanced so as to prolong the service life of solid-state disks.

Description

technical field [0001] The invention relates to the field of information storage, in particular to a method for improving the service life of SSD based on life balance multi-threading. Background technique [0002] TLC NAND flash is a type of flash that stores 3 bits in each memory cell. Its high storage density is more and more widely used in the field of solid-state hard drives and memories. [0003] In the 3 bit information of each storage unit of TLC NAND flash, they belong to different groups. Compared with the concept of page in MLC and SLC, the three data groups in TLC are called sub-pages, and the ones storing low bits are called sub-pages. Lowpage, the one that stores the middle bits is called middle page, and the one that stores high bits is called up page. The same Word Line (WL) to which the three sub-pages belong corresponds to the existence of pages in MLC and SLC. [0004] Consumer and enterprise users are particularly concerned about the service life of SSD...

AI Technical Summary

Problems solved by technology

The single-thread scheduling design has the following disadvantages: hot and cold data are distributed in the same data block, which cannot effectively separate hot and cold data, resulting in considerable write amplification and failing to achieve the long-term goal of life balance

But there are also the following disadvantages: the new features of NVMe cannot be used, and the access frequency of writing data needs to be actively distinguished through the host thread, causing additional write amplification problems

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