Expansion method of logical volume storage space

Abstract

An expansion method of logical volume storage space comprises the following steps: creating a logical volume by using a logical volume manager and distributing storage space in certain proportion; reserving a continuous expansion room behind the distributed storage space; judging whether the storage space needs expanding in real time during the writing process of data until the data writing is finished; if yes, calculating space expansion ascending coefficient according to the use condition of the reserved expansion room in advance to obtain the magnitude of the new expansion room needing reservation to be used for reserving a continuous expansion room one more time within the space range managed by the logical volume manager; and if no, directly writing the data. The method can dynamically expand the logical volume storage space as the continuous writing of the logical volume by data, and can effectively solve the problem of discontinuous room expansion, thus reducing the influence of the expansion room on the data reading / writing to the utmost low.

Description

technical field [0001] The invention relates to a method for expanding the storage space of a logical volume, in particular to a method for dynamically and continuously expanding the storage space of the logical volume along with the continuous writing of data to the logical volume. Background technique [0002] Logical volume management (English full name: Logical Volume Management, hereinafter referred to as LVM) is different from the traditional disk partition space division management method, which provides a higher-level and more efficient way to manage system disk storage space. To put it simply, the volume created through LVM management can easily adjust the storage medium without destroying the existing data. After a new hard disk is added, the new hard disk space can be immediately incorporated into the original volume for direct use. LVM can provide a complete storage space environment for large-scale database operating environments, and can also manage the availab...

AI Technical Summary

Problems solved by technology

For example: Before creating a logical volume, it is estimated that the logical volume needs to support 256GB of storage space, but in fact only 64GB of data is used, and the remaining space is wasted

[0007] Although many logical volume managers (Logical Volume Manager) support the function of shrinking and expanding the logical volume storage space, the shrinking function of the logical volume storage space is rarely used in practical applications, because it is difficult to predict Will the remaining space still be used? At present, the expansion function of the logical volume storage space can only be done manually by the administrator when the storage space is not enough, which increases the management cost. In addition, the existing logical volume space expansion method also has It will cause the problem of space discontinuity, which will affect the performance of data reading and writing

Therefore, in the currently known LVM technology, there is still no effective method for expanding the logical volume storage space that can overcome the disadvantages caused by the need to allocate a large enough storage space from the beginning of the establishment of the remote volume.

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