如果在文件系统级进行备份，就可能使数据库完全失效。
One may render a database completely useless should he back it up at the filesystem level.
“链接失效”会对Django设计用来创建的基于内容的Web站点的通信级和可用性造成很大的影响。
"Link rot" severely hurts the traffic levels and usability of content-based Web sites that Django was designed to create.
为了细化系统的失效检测，将检测模块集成到调度系统中，在任务级实现对调度器可用性判断。
To detail the failure detection of the system, detecting module is integrated into the scheduling system and the availability judgment of scheduler is conducted at the task level.
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