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A Novel Hybrid-Copy Algorithm for Live Migration of Virtual Machine

School of Computer Engineering and Science, Shanghai University, Shanghai 200444, China
Author to whom correspondence should be addressed.
Academic Editor: Sabah Mohammed
Future Internet 2017, 9(3), 37;
Received: 14 June 2017 / Revised: 9 July 2017 / Accepted: 13 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue Future Computing for Real Time Intelligent Systems)
PDF [1237 KB, uploaded 18 July 2017]


Live migration of virtual machines is an important approach for dynamic resource scheduling in cloud environment. The hybrid-copy algorithm is an excellent algorithm that combines the pre-copy algorithm with the post-copy algorithm to remedy the defects of the pre-copy algorithm and the post-copy algorithm. Currently, the hybrid-copy algorithm only copies all memory pages once in advance. In a write-intensive workload, copy memory pages once may be enough. However, more iterative copy rounds can significantly reduce the page faults in a read-intensive workload. In this paper, we propose a new parameter to decide the appropriate time to stop the iterative copy phase based on real-time situation. We use a Markov model to forecast the memory access pattern. Based on the predicted results and the analysis of the actual situation, the memory page transfer order would be adjusted to reduce the invalid transfers. The novel hybrid-copy algorithm is implemented on the Xen platform. The experimental results demonstrate that our mechanism has good performance both on read-intensive workloads and write-intensive workloads. View Full-Text
Keywords: live migration; virtual machine; hybrid-copy; Xen live migration; virtual machine; hybrid-copy; Xen

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lei, Z.; Sun, E.; Chen, S.; Wu, J.; Shen, W. A Novel Hybrid-Copy Algorithm for Live Migration of Virtual Machine. Future Internet 2017, 9, 37.

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