而副本的分配是动态的，其处理准则是根据系统的访问统计数据，触发对系统副本的添加或者是减少，或者是副本的迁移，从而达到最佳的负载平衡。
To obtain best load balance, the copies assignment is dynamic and according to system statistics data to trigger copies increasing or reducing, and perhaps copies migrating.
本文给出考虑负载变化率情况下有功发电分配的最佳方法。
This paper presents an active generation scheduling method, which takes the Loading rate into account.
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