在这种情形下卷管理将会适用：您的某个存储服务器已经存满数据，需要添加存储空间。
A scenario in which volume management would be useful is when you have a storage server that has filled up with data and storage needs to be added.
当内存缓存区域满时，lru会首先删除最近最少使用的缓存数据。
When the memory cache region becomes full, LRU removes the least recently used cached data first.
运行数据中心时，不能只盯着满架的服务器。
Running a data center is not just about keeping the lights on across the racks of servers.
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