无法进行自动配置，这是因为虚拟栈的单个组件没有足够信息来做出调优决策。
Automatic configuration is not available because the individual components of the virtualization stack do not have enough information to make tuning decisions.
这一层与PaaS的不同之处在于，只提供虚拟硬件，而没有软件栈。
This layer differs from PaaS in that the virtual hardware is provided without a software stack.
其概念是非常简单的：通过使用整个软件栈(操作系统、应用、配置数据等等)的虚拟映像来避免安装与配置上的冲突。
The concept is simple: avoid all installation and configuration hassles by using a virtual image of an entire software stack: operating system, application (s), configuration data, etc.
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