Method for achieving magnetic disk function extension based on driving layer plug-ins

Abstract

The invention discloses a method for achieving magnetic disk function extension based on driving layer plug-ins, and belongs to the field of computer system storage. The method comprises the steps that (1) a function extension module mangle is built and set, and module equipment is driven; (2) the function extension module obtains the initial position and the size of magnetic disk space and a temporarily-generated unique access identifier by providing magic, and the temporarily-generated unique access identifier is configured to be written into the magnetic disk space and is valid in a lasting mode; (3) udev event triggers a rule call of a function extension block equipment drive during every access of the magnetic disk, a virtual block equipment drive is guided out to a system after initialization is completed, and the virtual block equipment drive is used by an RAID module. The method has the advantages that IO iteration and bio inspection frequency are reduced, the performance is improved, the plug-in level is determined based on the priorities and the types of the plug-ins, the version compatibility is improved, the different plug-ins are constrained to have access to different zones of the hard disk and request import restraints, and the data disordering problem is solved.

Description

[0001] technical field [0002] The invention relates to a method for expanding the function of a disk, belonging to the field of computer system storage, in particular to a method for extending the function of a disk based on a driver layer plug-in. Background technique [0003] The disk module is the basic module of the storage system. The performance and robustness of the disk module seriously affect the overall performance and reliability of the storage product. Some core functions of the storage system require disk drivers to provide corresponding extensions. For example, disk self-repair and RAID fast synchronization require persistent storage space. [0004] The current disk drive extension is generally implemented through a multi-layer virtual disk solution, that is, each extension function corresponds to a layer of virtual block devices, and the order of virtual block devices is determined according to the characteristics of the extension functions, and the request ...

AI Technical Summary

Problems solved by technology

[0005] Due to its limitations, this design pattern is prone to problems of performance, compatibility and data disorder

First, there is a performance penalty due to IO iteration and bio validity checks on multi-tiered virtual disks

Secondly, multi-layer virtual block devices do not have mandatory hierarchical relationships and request write restrictions. Inserting a new virtual layer or removing some obsolete virtual layers will cause compatibility issues.

Thirdly, it is difficult for this architecture to realize the limitation of specific modules to write to the segment, which can easily lead to data disorder

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