为什么df -k和du-k的结果有这么大的区别？

nolandxu

我有一个用来存放数据库archive log的FS，用df和du查看结果如下
# df -k
/dev/db2arloglv     4194304   3106340   26%       20     1% /db2/PRD/log_archive

# du -k /db2/PRD/log_archive
1       /db2/PRD/log_archive/lost+found
2       /db2/PRD/log_archive/ARC_PRD
34664   /db2/PRD/log_archive/PRD
34667   /db2/PRD/log_archive

也就是说用df查看的结果是使用了1G左右，而用du查看的结果只用30M多一点，为什么会有这么大的差别？

dew

df 显示的有free的大小，你仔细看看应该不会有差别

zanexxx

have you tried: with -s ?
# du -sk /db2/PRD/log_archive

icewood

The du command displays the number of blocks used for files. If the File parameter specified is actually a directory, all files within the directory are reported on. If no File parameter is provided, the du command uses the files in the current directory.
Specifying
the -k flag calculates the block count in 1024-byte units.


he df command displays information about total space and available space on a
file system. The FileSystem parameter specifies the name of the device on which
the file system resides, the directory on which the file system is mounted, or
the relative path name of a file system. The File parameter specifies a file or
a directory that is not a mount point. If the File parameter is specified, the
df command displays information for the file system on which the file or
directory resides. If you do not specify the FileSystem or File parameter, the
df command displays information for all currently mounted file systems. File
system statistics are displayed in units of 512-byte blocks by default.

nolandxu

可不可以这么理解？
df和du在对文件系统的容量进行统计的时候，用了不同的方式。
如果是这样的话，那么他们分别用什么方式呢？

to dew
如何仔细看？

to zanexxx
用-s结果相同