Dynamic strip system design method based on RAID5 solid-state disk array

Abstract

The invention relates to a dynamic strip system design method and a dynamic strip strategy realization method based on a RAID5 solid-state hard disk array, and relates to the technical field of data storage. Data updating modes of reading, modifying, writing, reading, reconstructing and writing in the RAID5 solid-state hard disk array are replaced by using the mode of constructing dynamic stripe.The dynamic stripe design system of the invention comprises a stripe recombination module and a metadata module. The strip recombination module reconstructs the data blocks of local strips to form dynamic strips. The metadata module records and manages the mapping state and storage state of the data. The combination of the above two modules and a RAID5 array changes the request processing mode ofa traditional RAID5 array. The system separates the writing of full band from the writing of local band, so that data blocks in the local band are constructed to be dynamic strips through recombination. The dynamic and static stripes are mapped and managed by the metadata, which reduces the writing times of the solid-state disk, prolongs the service life of the array, reduces the pre-read delay before writing, and improves the writing performance of the array.

Description

technical field [0001] The invention relates to the technical field of data storage, in particular to a design method of a dynamic stripe system based on a RAID5 solid-state hard disk array and a method for implementing a dynamic stripe strategy. Background technique [0002] RAID is a mechanism that provides data redundancy protection. It abstracts multiple physical hard disks upwards into a logical disk, and forwards the file read and write requests issued by the upper system downwards, thereby realizing the redirection and forwarding function of data streams. During the forwarding of data streams, RAID implements multiple forms of data redundancy, including data mirroring and data verification, to provide data protection capabilities. Among many RAID levels, RAID5 has better parallel performance and higher hard disk space usage, so it is widely used. [0003] Stripe technology is commonly used in RAID array systems. It organizes the array space into stripes, performs dat...

AI Technical Summary

Problems solved by technology

The update of a full stripe requires the least read and write operations and the highest efficiency; the update of a non-full stripe can be divided into two specific situations, one is read, modify and write, and the other is read, reconstructed and written. In case of data update, it is necessary to read the old data in advance, and then write the new data after verification and calculation. This method is not only inefficient, but also introduces frequent verification updates.

[0005] The all-flash array is usually a RAID array system built with solid-state disks. The storage medium of the solid-state disk is NAND Flash, and the erasing times are limited, so the overall erasing times of the array will also be limited.

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