接着，WebSphere Extended Deployment创建所有的集群成员，并及时控制在任何给定时刻有多少成员处于活动状态。
WebSphere Extended Deployment then creates all of the cluster members and controls how many are active at any given moment in time.
系统不仅需要保证数据采集、控制、传输等周期任务在确定时间内完成，也要保证突发事件等非周期任务的及时响应。
Both periodic tasks such as information acquisition, control, data communication and aperiodic tasks such as arising from arbitrary critical events must be completed within their deadlines.
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