El Martes, 10 de Octubre de 2006 15:58, Atul Tyagi escribió: > Hi All, > > I am facing a little problem. I guess its more of a conceptual problem > rather than a OS issue. > > One of my software raid partiton /dev/md4 is about 30 GB. I had put a file > of about 18GB in that jus for few mins and then deleted that. Now even > after about 6 hrs. My RHEL4 system gives me weird output. following are the > outputs that might help you understand. > > df -h > === > > [root@pingu ~]# df -h > Filesystem Size Used Avail Use% Mounted on > /dev/md0 5.0G 2.7G 2.1G 56% / > /dev/md1 99M 17M 78M 18% /boot > none 1014M 0 1014M 0% /dev/shm > /dev/md2 5.0G 190M 4.5G 4% /var > /dev/md4 30G 22G 5.9G 79% /usr/local/test > > du -hs > ===== > [root@pingu ~]# du -hs /usr/local/test > 2.7G /usr/local/test > > Can some one please clear my doubt and explain why there is a such a hugh > difference in both the commands. Disk usage shown by df -h is 22G where as > du shows 2.7G. > > Would appriciate any pointer to this problem. > > Thanks, > > Atul quote from: http://www.acersupport.com/ess/articles/articles/14.cfm You may often see a difference in the output of the two commands "du" and "df". For example, a df -t is executed on a system and it comes back with the following: (/dev/root ): 216000 blocks 41950 i-nodes total: 260460 blocks 43392 i-nodes If you subtract the total blocks free from the total available you get: 44460. The command du -s (from the root directory) shows: 39130. This is a discrepancy of 5300 blocks. However, there is a big difference in how these two utilities work. The df command takes a look at the freelist and gives a picture of how many blocks are available for use. The du command takes a snapshot of the blocks in use by a file or directory, BUT, neither does it count the blocks used by the directory entries themselves, nor does it count the blocks used by special files (ie. device files, named pipes, etc.). So, if you want to get an approximation of what is in use from looking at the df -t output you need to perform one more step. Perform the subtraction to determine the number of i-nodes in use and then multiply that by 4. When you add that value to the one you got previously you will get an approximation of the total blocks in use. This will still not match exactly! The general point is that things aren't always as they seem at first glance. There are many utilities in UNIX. Determine what it is that you really want to know and then use the appropriate tool. -- Manuel Arostegui Ramirez. Electronic Mail is not secure, may not be read every day, and should not be used for urgent or sensitive issues. -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
