For find top 10 largest file
du -a / | sort -n -r | head -n 10
/]# du -sh * it also not showing free space then check For Check Open file which are deleted but not clear innode
lsof | grep '(deleted)'
to clear files without closing process use gdb for debug
gdb -p 24268 (24268) is process id
(gdb) p close(4)
$1 = 0
(gdb) q
you need to add " p close(4) " manually 4 is value which come in 4th row when you put lsof | grep '(deleted)' command
example
lsof | grep '(deleted)'
httpd 23782 root 27u REG 202,1 0 1225 /tmp/.ZendSem.DywBoH (deleted) tail 24268 root 3r REG 202,1 100544279 921329 nohup.out (deleted)
in this case (gdb) p close(3) after quit it will show free space without closing process or command
To truncate it:
: > /path/to/the/file.log
If it was already deleted, on Linux, you can still truncate it by doing:
: > "/proc/$pid/fd/$fd"
Where
$pid is the process id of the process that has the file opened, and $fd one file descriptor it has it opened under (which you can check with lsof -p "$pid".
If you don't know the pid, and are looking for deleted files, you can do:
lsof -nP | grep '(deleted)'
lsof -nP +L1,is an even better (more reliable and more portable) option (list files that have fewer than 1 link).
Or (on Linux):
find /proc/*/fd -ls | grep '(deleted)'
Or to find the large ones with
zsh:ls -ld /proc/*/fd/*(-.LM+1l0)
lsof -p $(pidof process name)gdb -p $(pidof process name)(gdb) p close(4)
$1 = 0
(gdb) q
http://serverfault.com/questions/501963/how-to-recover-free-space-on-deleted-files-without-restarting-the-referencing-pr
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