无论选择哪种虚拟化技术，都需要使用系统管理工具维护大型环境。

Regardless of the virtualization technology that you choose, you need system management tools to maintain a large environment.

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根设备实际上是来自系统管理程序的一个虚拟的设备，但您的服务器不会知道这一点。

This root device is actually a virtualized device coming from the hypervisor, but your servers won't know that.

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实现方法是从用户定义的池获取地址，把它与托管虚拟机的系统管理程序关联起来。

It does this by retrieving an address from a user-defined pool associated with the hypervisor hosting the virtual machine.

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