df和du的区别以及磁盘空间使用问题
solaris sparcroot
df -kb 结果
/dev/vx/dsk/home 12197220 11086515988733 92% /home
du -ks 查看/home分区情况为
10 dep
27 lost+found
395517oracle
288 bigml.lsof
212309wei
4041696 lan
346074xue
520 xue.log
du相加的结果和df的结果不同？！
请帮忙分析原因
df和du的区别以及磁盘空间使用问题
hehedf和du的区别以及磁盘空间使用问题
which is bigger?df or du?df和du的区别以及磁盘空间使用问题
你在/下用du -sk home看看df和du的区别以及磁盘空间使用问题
一样的，/home的使用量查出来，df的基本上比du的大一倍。会不会是应用程序的问题，我有一些程序在不停的写硬盘，而且基本上都是大文件。df和du的区别以及磁盘空间使用问题
# du -sk /data127046194 /data1
# df -k /data1
Filesystem kbytes used avail capacityMounted on
/dev/dsk/c2t6d0s6 48059735 27046194 20532944 57% /data1
这个是几天没运行程序的机器的结果。如果硬盘在进行操作的话，统计结果就不是那么准确了。
df和du的区别以及磁盘空间使用问题
但这个也太不准了吧，相差几个G啊！df和du的区别以及磁盘空间使用问题
或者这样问吧：df和du哪个准确？
df和du的区别以及磁盘空间使用问题
man du你仔细看一下 du的计算方法. 这两个命令都是准的,用处不一样.
df和du的区别以及磁盘空间使用问题
这个文档能给你一个满意的答复:)Document Id: 26928Synopsis: du and df Differences (originally published 8/91)
Update date: 2001-05-13Description: du and df Differences
-- --- -- -----------
This article explains how reporting disk usage du and reporting free disk space
on file systems df may show different numbers.
du
--
The du user command gives the number of kilobytes contained in all files and,
recursively, directories within each specified directory or file (filename).
If filename is missing, `.' (the current directory) is used.A file which
has multiple links to it is only counted once.
EXAMPLE:
system % du
5 ./jokes
33 ./squash
44 ./tech.papers/lpr.document
217./tech.papers/new.manager
401./tech.papers
144./memos
80 ./letters
388./window
93 ./messages
15 ./useful.news
1211 .
Note that the last number, 1211 is the grand total (in kilobytes) for the
directory.
df
--
The df user command displays the following information:
amount of disk space occupied by currently mounted file systems
the amount of used and available space
how much of the file system's total capacity has been used
Used without arguments, df reports on all mounted file systems.
EXAMPLE:
system % df
FilesystemkbytesusedavailcapacityMounted on
/dev/ip0a 7445 4714 1986 70% /
/dev/ip0g 42277 35291 2758 93% /usr
Note: used plus avail is less than the amount of space in the file system
(kilobytes) because the system reserves a fraction of the space in the file
system to allow its allocation routines to work well.The amount reserved is
typically about 10%.(This may be adjusted using the tunefs command.Refer to
the man pages on tunefs(8) for more information.)When all the space on a file
system, except for this reserve, is in use, only the super-user can allocate
new files and data blocks to existing files.This, however, may cause the file
system to be over allocated.When a file system is over allocated in this way,
df may report that the file system is more than 100% utilized.
If arguments to df are disk partitions (for example, /dev/ip0as or path names),
df produces a report on the file system containing the named file.Thus, df
shows the amount of space on the file system containing the current directory.
Problem Definition
------- ----------
This section gives the technical explanation of why du and df sometimes report
different totals of disk space usage.
When a program that is running in the background writes to a file while the
process is running, the file to which this process is writing is deleted.
Running df and du shows a discrepancy in the amount of disk space usage.The
df command shows a higher value.
Explanation Summary
----------- -------
When you open a file, you get a pointer.Subsequent writes to this file
references this file pointer.The write call does not check to see if the file
is there or not.It just writes to the specified number of characters starting
at a predetermined location.Regardless of whether the file exist or not, disk
blocks are used by the write operation.
The df command reports the number of disk blocks used while du goes through the
file structure and and reports the number of blocks used by each directory.As
far as du is concerned, the file used by the process does not exist, so it does
not report blocks used by this phantom file.But df keeps track of disk blocks
used, and it reports the blocks used by this phantom file.