Method and system for dynamic expansion of logical volume based on logical volume manager (LVM)

Abstract

The invention discloses a method for dynamic expansion of a logical volume based on a logical volume manager (LVM). The method comprises the steps of utilizing a qemu command to convert a mapping file of a logical volume into a qcow2 file format, and triggering a capacity maximum upper limit value of a bottom layer logical volume through an issued write IO; obtaining an undercapacity error reported by a virtual disk in libvirt, and recording a corresponding virtual machine name, a virtual machine id and a virtual disk path; searching a corresponding logical volume according to the virtual disk path, and judging whether expansion conditions are met; if the expansion conditions are met, executing expansion operation on the logical volume, and restarting a virtual machine according to the virtual machine name and the virtual machine id. According to the method, dynamic expansion can be performed in real time according to an upper layer service, the capacity of the bottom layer logical volume is distributed dynamically as required, and thus the disk space utilization rate is improved. The invention further discloses a system for dynamic expansion of the logical volume based on the LVM.

Description

technical field [0001] The invention relates to the field of cloud computing storage virtualization, in particular to a method and system for dynamically expanding the capacity of logical volumes based on LVM. Background technique [0002] KVM (Kernel Virtual Machine) virtualization has been supported by most Linux systems. It is a complete hardware-based virtualization that requires hardware support (such as Inter VT technology or AMDV technology), and mainly supports virtualization management of CPU and memory. qemu mainly simulates IO devices such as disks and network cards. The technology based on qemu-KVM is a complete simulator, which can provide a complete simulation environment of CPU, memory, network, IO and so on. libvirt is a software collection that provides a single way to provide a variety of virtualization management methods and hypervisors, and provides developers or managers with a variety of API libraries and command line tools for managing virtual machin...

AI Technical Summary

Problems solved by technology

However, since the capacity of the underlying logical volume cannot be dynamically expanded and allocated according to the upper-level business in real time, the disk space utilization rate cannot be improved.

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