A disk bandwidth allocation mechanism with priority
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Abstract
Virtualization is a popular technology. Services and applications running on each virtual machine have to compete with each other for limited physical computer or network resources. Each virtual machine has different I/O requirement and special priority. Without proper scheduling resource management, a load surge in a virtual machine may inevitably degrade other’s performance. In addition, each virtual machine may run different kinds of application, which have different disk bandwidth demands and service priorities. When assigning I/O resources, we should deal with each case on demand. In this paper, we propose a dynamic virtual machine disk bandwidth control mechanism in virtualization environment. A Disk Credit Algorithm is introduced to support a fine-gained disk bandwidth allocation mechanism among virtual machines. We can assign disk bandwidth according to each virtual machine’s service priority/weight and its requirement. Related experiments show that the mechanism can improve the VMs’ isolation and guarantee the performance of the specific virtual machine well.
Keywords
Virtualization Performance isolation Bandwidth allocation I/O resource PriorityNotes
Acknowledgements
This work is supported by National Natural Science Foundation under grant No. 61003007 and No. 61133008, MOE-Intel Special Research Fund of Information Technology under grant MOE-INTEL-2012-01, Chinese Universities Scientific Fund under grant No. 2012TS046, Wuhan Chenguang Program under grant No. 201271031369.
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