一个朋友用dump命令备份文件后重启失败，怀疑是覆盖了主文件系统或备份过程失败。具体情况得看操作的过程。之前没有用过dump，简单看了下。
dump(8) - Linux man page
Description
Dump examines files on an ext2/3 filesystem and determines which files need to be backed up. These files are copied to the given disk, tape or other storage medium for safe keeping (see the -f option below for doing remote backups). A dump that is larger than the output medium is broken into multiple volumes. On most media the size is determined by writing until an end-of-media indication is returned.
等他们那边提供详细的操作信息后，再继续分析。
dump支持备份到多个设备上，这点比较有意思。
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