目前，最多能将一个持久性存储单元关联到一个给定实例，如图1中所示。
Currently, a maximum of one persistent storage unit can be associated to a given instance, as shown in Figure 1.
一个实例是Compuware的OptimalJ 15，它不是开源产品，且目前只支持基于J2EE的应用程序的生成。
One example is Compuware's OptimalJ 15, which is not an open source product and currently only supports generation of J2EE-based applications.
目前情况下，Eucalyptus也不支持不同VM实例间的文件共享。
In its current incarnation, Eucalyptus also doesn't support sharing files among different VM instances.
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