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.
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.
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.
应用推荐