安装该选项时，可以在主和次节点之间进行选择。

When you are installing this option, you can select between a primary and a secondary node.

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选择次选项会向现有集群添加一个次节点。

Selecting the secondary option adds a secondary node to an existing cluster.

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原因在于，次节点上的副本仍然指向主节点的存储库。

The reason is that the copy on the secondary node is still pointing to the repository of the primary node.

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