系统数据区域(Global System Data)：缓存中除了存放用户数据以外，还会存放一些供Director使用的系统数据，例如磁盘设备列表(Device Table)列出了每个Slot对应的磁...
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正如繁忙交叉点处的流量需要备份一样，系统关键区域的数据也只会在负载量大时才会备份。
Just as traffic backs up at some intersections only in heavy traffic, data can back up in your system in critical areas only when under heavy load.
系统意外中止时，选中的内核数据区域将被复制到主转储设备。
When a system is halted unexpectedly, selected areas of kernel data are copied to the primary dump device.
数据区域类用于在系统上读取、写入、创建和删除数据区域。
The data area classes are used to read, write, create, and delete data areas on the system.
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