为避免由于代价高昂的产品召回所造成的失败，本实例形象地说明了在子系统级别理解产品的重要性。

This example serves to illustrate the importance of understanding a product at the level of its sub-systems, in order to prevent complex failure modes leading to costly product recalls.

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对于本实例，您为您的三个服务器集群创建两个额外的引擎。

For this example, you create two additional engines for your three server cluster. The commands have the following formats.

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依赖于用户的选择(本实例中为Source)，当用户在图表上下移光标时，弹出菜单上可用选项的数量会随之改变。

Depending on the selection (Source in this case), the number of options available changes on the menu that pops up when the user drops the cursor on the Diagram surface.

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