df and du showing different Size

df and du shows different Size and recovering the space without killing the process

1. From lsof we can find the big 10 files which is deleted. And the first file is around  ((2407845888 / 1024 ) /1024) = 2296 MB

       
[root@server1  fd]# lsof | grep deleted | sort -nr -k 7 | head
frmweb    21199    mislve   23u      REG      253,0 2407845888     819375 /tmp/filesvuEFz.TMP (deleted)
frmweb    28933    mislve   27u      REG      253,0    4032864     819378 /tmp/fileiTj11l.TMP (deleted)
frmweb    16365    mislve   24u      REG      253,0    2248832     819483 /tmp/file5z0oen.TMP (deleted)
frmweb    28697    mislve   27u      REG      253,0     959488     819238 /tmp/fileemrhVz.TMP (deleted)
frmweb    24794    mislve   27u      REG      253,0     906304     819492 /tmp/file4d68i0.TMP (deleted)
frmweb    25383    mislve   24u      REG      253,0     393216     819572 /tmp/file7powEH.TMP (deleted)
frmweb    25329    mislve   28u      REG      253,0     386784     819355 /tmp/filembs5IG.TMP (deleted)
frmweb    24400    mislve   28u      REG      253,0     307328     819228 /tmp/fileL8p1m7.TMP (deleted)
frmweb     2717    mislve   27u      REG      253,0     277472     819290 /tmp/fileVzblkn.TMP (deleted)
frmweb     2002    mislve   24u      REG      253,0     262784     819516 /tmp/fileUeZpzA.TMP (deleted)

2. One option is to kill the process or nullfy the File Descripter (FD).We can find the FD as shown below.

       
[root@server1 fd]# ls -l /proc/21199/fd/ | grep deleted
lrwx------ 1 mislve dba 64 Feb 19 13:00 23 -> /tmp/filesvuEFz.TMP (deleted)
       

3.Nullify the file descripter

[root@server1 fd]#  echo /dev/null >  /proc/21199/fd/23
 

4. Size of the Fileystem before and after

     

Before
[root@server1 ~]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       11G  5.8G  4.3G  58% /

After
[root@server1 ~]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       11G  3.6G  6.5G  36% /