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.
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。
LVM actually controls all the physical disk resources on your system and helps provide a logical view of your storage subsystem.
实际上，LVM控制系统中所有的物理磁盘资源，并帮助提供存储子系统的逻辑视图。
Some of the more fault-tolerant RAID levels, such as RAID10 and RAID6, help provide an extra assurance that the storage subsystem can survive various disk failures.
一些容错性更好的RAID级别(比如RAID10和RAID6)帮助提供一层额外保障，确保存储器子系统能够经受各种磁盘故障。
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