操作系统的虚拟内存子系统允许应用程序分配的内存超过系统上实际存在的内存量，不足的部分由磁盘上的临时存储组成。
The operating system's virtual memory subsystem allows applications to allocate more memory than actually exists on the system, with the shortage being made up by temporary storage on disk.
虚拟磁盘使得基于POWER5的系统中的多个分区可以共享存储器。
Virtual storage allows multiple partitions within a POWER5-based system to share storage.
在虚拟存储系统中，一个固定长度的连续虚拟地址块，在分页操作过程中它作为一个单位在内存和磁盘之间来回复制。
In a virtual storage system, a fixed-length block of contiguous virtual addresses copied as a unit from memory to disk and back during paging operations.
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