df reports that the root partition is almost full, but the reason is not found with du

Solution Verified - Updated -

Issue

  • df reports that the root partition is almost full, but the reason is not found with du.

    # df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/sda5              20G   20G     0 100% /
    /dev/sda10            186G  293M  176G   1% /backup1
    /dev/sda9             3.0G   70M  2.7G   3% /home
    /dev/sda8             3.9G  126M  3.6G   4% /tmp
    /dev/sda7             7.8G  2.6G  4.9G  35% /usr
    /dev/sda6             7.8G  2.9G  4.5G  39% /var
    /dev/sda3              20G  721M   18G   4% /opt
    /dev/sda1              99M   14M   80M  15% /boot
    tmpfs                 5.8G     0  5.8G   0% /dev/shm
    
    
    
    # find / -maxdepth 1 | egrep -v "^/$|/backup1|/home|/tmp|/usr|/var|/opt|/boot" | xargs du -sh
    0       /.autofsck
    8.0K    /mnt
    22M     /lib64
    6.3M    /root
    123M    /lib
    8.5G    /u01
    16K     /lost+found
    0       /sys
    8.2M    /bin
    0       /.autorelabel
    0       /proc
    93M     /etc
    180K    /dev
    8.0K    /media
    8.0K    /selinux
    8.0K    /srv
    33M     /sbin
    
  • There are no 'deleted' files found in lsof output.

  • Issue persists across reboots.

Environment

  • Red Hat Enterprise Linux

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