Space management method and device

Abstract

Embodiments of the present invention provide a space management method and apparatus. The method comprises: when it is determined that granularity conversion needs to be performed, determining a first logic address space that granularity conversion needs to be performed on according to an allocation state of a first granularity logic address space, wherein the first logic address space comprises at least two logic address units, a physical address space corresponding to the first logic address space is a first physical address space, and the first physical address space comprises at least two physical address units; migrating data in the first physical address space into a second physical address space, so as to make physical address spaces corresponding to consecutive logic address spaces consecutive and improve access performance. Moreover, because metadata is managed by converting small granularity into large granularity, physical space occupied by metadata and complexity of the metadata can be reduced, the time and number of times of querying and modifying the metadata when a host I / O accesses can be lowered, and thus access performance can be improved.

Description

technical field [0001] The embodiments of the present invention relate to computer technology, and in particular to a space management method and device. Background technique [0002] Thin provisioning technology is a storage virtualization technology widely used in the storage industry. Its principle is to use thin pools to manage storage resources in a unified manner, and then allocate storage resources to thin volumes on demand for upper-level business use. In thin provisioning technology, metadata is used to record the mapping relationship between logical addresses and physical addresses of thin volumes. The design of metadata directly determines the performance, reliability and scalability of storage. [0003] In the thin provisioning technology, although the smaller the granularity of the space division, the more obvious the space saving effect, but the smaller the granularity of the space division, the more complex the mapping relationship between logical addresses an...

AI Technical Summary

Problems solved by technology

[0005] figure 1 Schematic diagram for the growth of physical space allocation, such as figure 1 As shown, as the business grows, the physical space allocation increases, and the physical space corresponding to the Logical Block Address (LBA) on the Logical Unit Number (LUN) is gradually continuous (that is, the logical address on the LUN The physical address space has been allocated), no space is saved, and the metadata organization relationship is becoming more and more complex, and the number and time of querying and modifying metadata during host I / O access also increase accordingly, resulting in reduced access performance; in addition , because the physical address space corresponding to the logical address space with continuous addresses is discontinuous, the sequential I / O access of the host in the discrete random I / O scenario will increase the disk access time and times, thereby reducing the access performance

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