它把数据分散在几个物理服务器上，但是用户作为一个与UNIX相似的文件系统资源操作它。
It spreads data over several physical servers, but the user treats the amalgam as one UNIX-like file system resource.
虚拟文件系统建立了不同的基础物理文件系统到逻辑文件系统之间的桥梁，为操作系统中的其他部分提供了一致的目录树层次结构。
The virtual file system bridges the underlying disparate physical file system to the logical file system, providing a consistent directory tree hierarchy to the rest of the operating system.
Web服务器的基本操作系统将在物理内存中缓存最近从磁盘读取的文件。
A web server's underlying operating system will cache files that were recently read from disk in physical memory.
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