Due to the growing demand of flexible resource management for cloud computing services, researches on live virtual
machine migration have attained more and more attention. Live migration of virtual machine across different hosts has
been a powerful tool to facilitate system maintenance, load balancing, fault tolerance and so on. In this paper, we use a
measurement-based approach to compare the performance of two major live migration technologies under certain network
conditions, i.e., VMotion and XenMotion. The results show that VMotion generates much less data transferred than
XenMotion when migrating identical VMs. However, in network with moderate packet loss and delay, which are typical in
a VPN (virtual private network) scenario used to connect the data centers, XenMotion outperforms VMotion in total
migration time. We hope that this study can be helpful in choosing suitable virtualization environments for data center
administrators and optimizing existing live migration mechanisms.
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