【Key words】 Large scale VoD server； Logically hierarchical cluster； Load balance； Replication methods； Local load migration； Server selection；
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一个区域可能部署了分属于不同逻辑层次簇群的多个服务器节点，需要通过负载迁移进一步平衡它们之间的负载。
The cooperative nodes deployed in a local region maybe belong to different logically hierarchical cluster, so the local load migration is used to further balance their load.
仿真结果表明，用户请求高峰期的逐流管理开销远小于连续媒体对象的投递带宽，逻辑层次簇群的管理开销可以忽略不计。
The simulation result shows that the per-stream management overhead is extraordinary smaller than the delivery bandwidth of multimedia object, so the management overhead can be neglected.
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