A mapping management method based on phase-change memory and solid-state hard disk

A technology of phase change memory and management method, applied in the field of solid state hard disk and mapping management based on phase change memory, can solve the problems of low performance and long HOST read and write completion time, and achieve the effect of improving read and write performance and reducing completion time.

Active Publication Date: 2021-10-01
SHENZHEN YILIAN INFORMATION SYST CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the scenario where the host HOST reads and writes randomly, the system needs to frequently exchange mapping table information with NAND, and the HOST reads and writes take a long time to complete and the performance is low

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  • A mapping management method based on phase-change memory and solid-state hard disk
  • A mapping management method based on phase-change memory and solid-state hard disk
  • A mapping management method based on phase-change memory and solid-state hard 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] Phase-change memory, referred to as PCM, uses the difference in conductivity of special materials when they transform between crystalline and amorphous states to store data. Phase-change memory is usually an information storage device that uses the huge conductivity difference between chalcogenides in the crystalline and amorphous states to store data.

[0020] figure 1 It is a schematic diagram of a solid-state hard disk system based on the mapping managem...

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Abstract

The invention discloses a mapping management method based on a phase-change memory and a solid-state hard disk, which is characterized in that two-level mapping tables are used for management, specifically including a first-level table and a second-level table, and the second-level table is stored in a phase-change memory PCM , the secondary table records the relationship between logical addresses and physical addresses of all user data pages, the secondary table is divided into multiple secondary table subunits according to the granularity G, and the cache of the hard disk controller is divided into secondary table subunits The basic unit performs data replacement. By introducing phase-change memory to store the mapping table, the read and write time of phase-change memory is much lower than that of NAND. This patent introduces phase-change memory in NODRAM solid-state hard disk instead of NAND to save the complete mapping table, reducing the mapping time in the on-chip SRAM. The table cache replaces the time for mapping table information, thereby reducing the completion time of read and write commands and improving read and write performance.

Description

technical field [0001] The invention relates to the field of storage technology, in particular to a phase-change memory-based mapping management method and a solid-state hard disk. Background technique [0002] In the existing solid-state hard disk system without DRAM, because of the space limitation of the on-chip SRAM, it is not enough to store the entire mapping table (the mapping table refers to the table that records the mapping relationship between the logical address of the data page and the NAND physical address), and the complete mapping table Stored in NAND, a cache cache is maintained in the on-chip SRAM, and part of the mapping table is cached in the cache, that is, the recently accessed data page logical address to physical address mapping relationship. In the random read / write scenario of the host HOST, the system needs to frequently exchange mapping table information with the NAND, and the HOST read / write takes a long time to complete and the performance is lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/1009G06F12/02G06F12/0882G06F12/128
CPCG06F12/0246G06F12/0882G06F12/1009G06F12/128G06F12/0238G06F2212/7201
Inventor 张星李建
Owner SHENZHEN YILIAN INFORMATION SYST CO LTD
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