While RAID at the basic level provides this functionality, the term storage virtualization typically includes additional concepts such as data migration and caching.
尽管RAID在基础的层面上提供了这一功能，但存储虚拟这一术语典型地包括了更多附加的概念，比如数据迁移以及缓存。
This is just one facet of our mind's habit of comparing everything with everything else, from complex concepts like money right down to the most basic perceptual level.
在人们心中总是要将不同事物进行对比，从复杂的概念（比如钱）到最基础的人类感官。
The first few pages of this article discuss some basic concepts and principles of performance management in order to "level set."
本文的头几页将讨论性能管理的一些基本概念和准则，以便进行"级别设置" 。
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