Virtual machine storage space management method, system and physical host

Abstract

The invention discloses a virtual machine storage space management method. In the method, virtual storage free block information is directly acquired by a storage balloon agent module which is deployed in a virtual machine, and the acquired virtual storage free block information is transmitted to a storage balloon daemon process module which is deployed in a virtual machine monitoring unit layer; and the storage balloon daemon process module partially or totally releases a physical storage space corresponding to the virtual storage free block information and labels virtual storage blocks corresponding to the released physical storage space to be unavailable. The invention also discloses a corresponding system and physical host. Due to the method, the service condition of the virtual storage space can be acquired in real time, the massive reading / writing operation of a storage system can be avoided, and the method is suitable for virtual storage systems in a dynamic allocation format and a pre-allocation format.

Description

technical field [0001] The invention relates to the technical field of computer virtualization, in particular to a virtual machine storage space management method, system and physical host. Background technique [0002] Computer virtualization technology is a decoupling method that separates the underlying computer hardware from the upper-level operating system and applications. It introduces a virtual machine monitor (VMM, Virtual Machine Monitor) layer to directly manage the underlying hardware resources, and creates The hardware-independent virtual machine (VM, VirtualMachine) is used by the upper-layer operating system and application programs, and the corresponding virtual machine architecture is as follows: figure 1 shown. Virtualization technology, as one of the underlying important supporting technologies of the current popular cloud computing (Cloud Computing) platform, can greatly improve the resource utilization efficiency of physical devices. Compared with the ...

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Problems solved by technology

[0010] In the process of realizing the present invention, the inventor found that: in the above method, the process of clearing the free blocks in the virtual disk to "0" by VM Tools requires writing to all free blocks; , it is necessary to perform read operations on all data blocks, that is, the existing method has relatively large operation overhead, and more disk read and write operations waste a lot of disk bandwidth and take a long time; moreover, in the existing method, the host computer recognizes " 0" blocks to indirectly determine the space occupancy of each data block in the virtual disk, so it is impossible to obtain the global free data block information of the virtual machine disk in real time; in addition, the application of this existing method is limited, and it is only suitable for dynamically allocated image formats. The pre-allocated image format cannot release free blocks

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