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The virtual machine image file space waste recovery system

Author: LingXiao
Tutor: JinHai
School: Huazhong University of Science and Technology
Course: Computer System Architecture
Keywords: Virtualization The virtual machine image file Waste Space Virtual Disk Dynamically remove
CLC: TP302
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


In a virtualized environment, the virtual machine image file on the physical node to preserve the integrity of the virtual machine runtime environment and user data. However, virtualization brings semantic isolation makes virtual machine image file of a virtual machine for all deleted data, which greatly wasted storage resources, damage the interests of users. Currently, the image file management tools must interrupt the virtual machine service manual scan virtual disk files or records in order to recycle the waste data. Therefore, to ensure user transparency and availability of virtual machines under the premise of image files recovered waste space, improve utilization of storage space, becoming a serious problem. The virtual machine image file space waste recycling system VMcol (Garbage Collector for Virtual Machine Image) transparent to the user and to ensure the availability of the virtual machines under the premise can be automatically recovered without scanning the virtual machine image file abandoned space. As VMcol system to achieve the user delete operation monitoring, automatic data conversion, file content dynamically delete function, so when the virtual machine file is deleted, VMcol system to a virtual machine image file timely recovery of waste space. The system consists of a user deletes spatial processing operations monitoring and disposal of two parts. When users delete operation within a virtual machine, the user delete operation deletes monitor real-time capture and parsing delete nodes, so as to obtain valid information, and then use the information timely information delivery model is passed to waste spatial processing layer. Waste spatial processing based on the information coming through the information into the image file format parsing, without scanning the image file you can determine the corresponding image file in a virtual machine obsolete data location, and then in the case of maintaining the availability of the virtual machine, delete files in the waste data. Virtualization platform based on Xen 3.3.1 and Qcow image file, using C language and Python language VMcol system. Function tests showed that in the case of virtual machines without interruption, VMcol system virtual machine image file can be recovered waste space and improve disk space utilization. Performance analysis shows, VMcol system operation does not affect the user the deletion of the virtual machine server CPU performance and read performance, and disk bandwidth. In addition, when the image file is released waste space, virtual disk write bandwidth is increased by 8%, the read bandwidth, increased 2.7%.

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