Data Center Hybrid Disk Array and Dynamic Data Migration Strategy thereof

Abstract

The invention relates to a data center hybrid disk array, comprising: a mechanical hard disk used for storing sequential access to write-based data blocks; a solid-state disk for storing data blocks which are randomly accessed and mainly read; an array controller maintaining a mapping between a logical block and a physical block, and mapping the logical block to a physical block of a solid state hard disk or a mechanical hard disk; by maintaining a hash-linked list of accessed data blocks, the device number, logical block address, access frequency, read-write ratio, and average request size ofthe data block are recorded, and the transition status value being calculated. The invention also discloses a data dynamic migration strategy of a data center hybrid disk array. The hybrid disk arrayof the invention utilizes the mechanical hard disk with larger capacity to store most of the data, and utilizes the solid-state hard disk with smaller capacity to store the data accessed randomly bythe hot spots, so as to meet the requirements of large capacity, high performance and low cost of the data center storage system.

Description

technical field [0001] The invention relates to the technical field of computer storage, in particular to a data center hybrid disk array and a data dynamic migration strategy thereof. Background technique [0002] With the development of electronic information technology, solid-state hard drives based on NAND flash memory technology are gradually applied to storage systems. Solid-state drives eliminate the rotational characteristics of mechanical hard drives, which makes the access performance of solid-state drives tens or even hundreds of times higher than that of mechanical hard drives. Another important characteristic of solid-state drives is the asymmetry of reading and writing, and the performance of reading is higher than that of writing. In addition, frequent write operations will trigger expensive garbage collection operations, which will affect the service life of SSDs. [0003] Since solid-state drives cannot compete with traditional mechanical hard drives in te...

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Problems solved by technology

[0004] At present, the hybrid disk arrays (such as RAID5 and RAID6) in the data center do not store data according to the access characteristics of the load. On the one hand, it may cause a large number of random requests to be concentrated on the mechanical hard disk. On the other hand, it may also cause a large number of write requests to be concentrated. in SSD

This will not only reduce the overall performance of the disk array in the data center, but also shorten the service life of the solid state drive, thereby reducing the reliability of the data center storage system

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