A method and system for managing disk expansion space based on secondary allocation

Abstract

The invention provides a disk expansion space management method and system on the basis of secondary allocation and belongs to the field of disk management. The disk expansion space management includes steps of dividing a reserved area into a mirror image data area and a routine data area; receiving data requests launched to the reserved area, further judging whether the data requests are within the mirror image data area or not if with read-write authority; if yes, reading and writing mirror images, and if not, reading and writing in routine. On the basis of secondary allocation and character string identifications, version compatibility is improved; metadata are written in by the mirror images, and system robustness is improved; other modules access expansion space via a module interface of the reserved area, access restrictions of the reserved area are realized, and the problem of data disorder is solved.

Description

technical field [0001] The invention belongs to the field of disk management, in particular to a method and system for managing disk expansion space based on secondary allocation. Background technique [0002] 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 corresponding extensions provided by the disk driver, such as disk self-repair and disk The fast synchronization of array RAID needs to reserve persistent storage space; at the same time, the data on the disk is more important than other data, such as the loss of self-repairing metadata, which makes it impossible to judge and execute the read-write mapping, and all the data on the disk is no longer meaningful. [0003] The current disk driver extension is generally implemented through the multi-layer virtual disk scheme, that is, eac...

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Problems solved by technology

[0004] Due to its limitations, this design pattern is prone to problems of performance, compatibility, robustness, and data disorder; first, performance loss due to IO iteration and bio validity checks on multi-layer virtual disks; second, multi-layer virtual disks Block devices do not have a mandatory hierarchical relationship with each other and request write restrictions. Inserting a new virtual layer or removing some obsolete virtual layers will cause compatibility issues; again, the expansion functions maintain storage space reservations separately, resulting in the same function The code is repeated many times, which leads to the reduction of system robustness and maintainability; finally, the architecture is difficult to achieve the limitation of specific module write section, which easily leads to data disorder

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