由于要保持目标和源一致，使用了--delete参数，但是现在发现删除失效了。查看了同步的日志，由于如下错误造成删除中止。 
file has vanished: "/news/2009-02-16/388082.shtml"
 IO error encountered -- skipping file deletion
shell进到这个目录下ls能补全出这个文件名字，但是显示的时候不存在，报错找不到这个文件。

最后重新复制一个同名文件出来，rsync才恢复了删除模式。

最后学到的经验是：给rsync加上 --ignore-errors 参数

            --existing              skip creating new files on receiver
            --ignore-existing       skip updating files that exist on receiver                              
            --remove-source-files   sender removes synchronized files (non-dir)
            --del                   an alias for --delete-during
            --delete                delete extraneous files from dest dirs
            --delete-before         receiver deletes before transfer (default)
            --delete-during         receiver deletes during xfer, not before
            --delete-delay          find deletions during, delete after
            --delete-after          receiver deletes after transfer, not before
            --delete-excluded       also delete excluded files from dest dirs
            --ignore-errors         delete even if there are I/O errors
            --force                 force deletion of dirs even if not empty
            --max-delete=NUM        don't delete more than NUM files