Hi Sachchidanand, On Unix-like operating systems, if a process has a file open, and you delete the file, it will not be removed from disk immediately. That will only happen when the process closes the file descriptor, or exits. People new to Unix-like operating systems often don't know this. So you may have one or more such files on your / partition. Install a utility called "lsof", run "lsof -n" as root, and grep the output for the word "deleted", and examine those files, and see which processes are holding them open. Then either restart those processes, or reboot the server. Regards, Anand Buddhdev On 29/06/2020 11:51, Sachchidanand Upadhyay via CentOS wrote: > Hi, > > While checking with df -h, it's showing the used space is 94% on root (/). If checked with du -sh, it's not showing the used space. > > # df -h > Filesystem Size Used Avail Use% Mounted on > devtmpfs 7.8G 0 7.8G 0% /dev > tmpfs 7.8G 0 7.8G 0% /dev/shm > tmpfs 7.8G 857M 7.0G 11% /run > tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup > /dev/mapper/centos-root 50G 47G 3.4G 94% / > /dev/mapper/centos-home 241G 47G 195G 20% /var/log > /dev/sda1 1014M 189M 826M 19% /boot > tmpfs 1.6G 0 1.6G 0% /run/user/0 > tmpfs 1.6G 0 1.6G 0% /run/user/1002 > > > # du -sh /* > 0 /bin > 156M /boot > 0 /dev > 33M /etc > 388K /home > 0 /lib > 0 /lib64 > 0 /media > 0 /mnt > 0 /opt > du: cannot access ‘/proc/21489/task/21489/fd/4’: No such file or directory > du: cannot access ‘/proc/21489/task/21489/fdinfo/4’: No such file or directory > du: cannot access ‘/proc/21489/fd/4’: No such file or directory > du: cannot access ‘/proc/21489/fdinfo/4’: No such file or directory > 0 /proc > 6.1M /root > 857M /run > 0 /sbin > 0 /srv > 0 /sys > 0 /tmp > 2.8G /usr > 62G /var > > > # du -sh /var/* > 0 /var/adm > 89M /var/cache > 0 /var/crash > 8.0K /var/db > 0 /var/empty > 0 /var/games > 0 /var/gopher > 0 /var/kerberos > 16G /var/lib > 0 /var/local > 0 /var/lock > 47G /var/log > 0 /var/mail > 0 /var/nis > 0 /var/opt > 0 /var/preserve > 0 /var/run > 98M /var/spool > 0 /var/tmp > 499M /var/www > 0 /var/yp > > How can i find this hidden space? >