Method for reading and writing segment-based shingle translation layer (SSTL)

Abstract

The invention discloses a method for reading and writing a segment-based shingle translation layer (SSTL). A shingle magnetic disk is directly applied in an existing storage system; reading and writing of the SSTL are carried out; for an address mapping table, an intra-segment dynamic block mapping method is adopted; the writing magnification times of the shingle magnetic disk is effectively reduced; the performance of the magnetic disk is improved; and simultaneously, in the SSTL, a non-volatile random-access memory (NVRAM) in the shingle magnetic disk is managed by using a writing cache replacement algorithm based on a least recently used segment. According to the method for reading and writing the SSTL provided by the invention, the data write-in operation times and the segment arrangement operation times are effectively reduced; the writing magnification times of the shingle magnetic disk is reduced; and the performance of the shingle magnetic disk is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of data storage, and more specifically relates to a method for reading and writing a tile record conversion layer based on a segment structure. Background technique [0002] As the main data storage device of computer system, disk has been developed for more than 60 years. However, the superparamagnetic effect hinders the improvement of the magnetic recording areal density. Currently, the areal density of magnetic disks using perpendicular magnetic recording technology has reached the upper limit 1Tb=in 2 . Tile recording technology increases track density by partially overlapping tracks. [0003] Magnetic recording disks have an inherent disadvantage: writing data to the current track will overwrite the data of subsequent tracks, resulting in loss of subsequent track data; tile recording technology uses partially overlapping tracks to record data; tile recording disks cannot directly replace traditional ...

AI Technical Summary

Problems solved by technology

[0003] Magnetic recording disks have an inherent disadvantage: writing data to the current track will overwrite the data of subsequent tracks, resulting in loss of subsequent track data; tile recording technology uses partially overlapping tracks to record data; tile recording disks cannot directly replace traditional disks Applied to the existing storage system

In order to overcome the physical limitations of the writing operation of the tile recording technology, there are two solutions, one is to use the tile recording conversion layer STL (ShingleTranslationLayer) to cover up the difference in the writing operation; the other is to design a file system dedicated to the tile recording disk or Object storage system; both of the above two solutions need to solve the problem of write amplification caused by the inability of tile recording disks to overwrite

[0004] In the prior art, the data layout management method based on the segment structure is used for reading and writing, and the entire disk surface is divided into multiple tile recording areas, each area contains a plurality of continuous tracks; in the radial direction, each tile records The area is divided into segments of the same size, and each segment has a unique logical segment number; in each segment, the sectors on the same track form a block; thus, the entire disk follows the "area-segment-block-sector" form; this scheme reduces the write amplification from the area to the segment size, but the in-place update mode and segment-level write amplification of the tile record disk based on the segment structure still need further optimization

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