On one of my host, i have /dev/mapper/centos-root reporting almost full (99%), here is output of df -h.


[root@LA3QSSD02-20217 /]# df -h
Filesystem                                       Size  Used Avail Use% Mounted on
/dev/mapper/centos-root                           50G   50G  540M  99% /
devtmpfs                                          63G     0   63G   0% /dev
tmpfs                                             63G   64K   63G   1% /dev/shm
tmpfs                                             63G   18M   63G   1% /run
tmpfs                                             63G     0   63G   0% /sys/fs/cgroup
/dev/sdy1                                        494M  210M  285M  43% /boot
/dev/mapper/centos-home                          411G   33M  411G   1% /home
/dev/mapper/datastore-datastore                   11T  548G  9.1T   6% /datastore 
/dev/mapper/data-sdx                             734G   73M  734G   1% /data-sdx 
/dev/mapper/data-sdf                             734G   73M  734G   1% /data-sdf
/dev/mapper/data0                                734G   80M  734G   1% /data0 
/dev/mapper/data-sdd                             734G   73M  734G   1% /data-sdd 
/dev/mapper/data-sdt                             734G   73M  734G   1% /data-sdt 
/dev/mapper/data-sdg                             734G   73M  734G   1% /data-sdg 
/dev/mapper/data-sdu                             734G   73M  734G   1% /data-sdu 
/dev/mapper/data-sdb                             734G   73M  734G   1% /data-sdb 3.0T  1.8T  1.3T  58% /vol/eq1ag4rdtest01/kvm_ostemplates
tmpfs                                             13G     0   13G   0% /run/user/0


Im unable to find out what is causing / to report full, here is some more details.


du -sh *

0       bin
229M    boot
5.5M    data0
0       data-sdb
0       data-sdc
0       data-sdd
0       data-sde
0       data-sdf
0       data-sdg
0       data-sdh
0       data-sdi
0       data-sdj
0       data-sdk
0       data-sdl
0       data-sdm
0       data-sdn
0       data-sdo
0       data-sdp
0       data-sdq
0       data-sdr
0       data-sds
0       data-sdt
0       data-sdu
0       data-sdv
0       data-sdw
0       data-sdx
698G    datastore
152K    dev
24M     etc
320K    home
0       lib
0       lib64
0       media
0       mnt
171M    opt
0       proc
160M    root
115M    run
0       sbin
20K     sharedstore
0       srv
0       sys
40K     tmp
2.6G    usr
1.8G    var
1.7T    vol


Please help me in find out what is consuming space on / and how to free it.


Regards Aun

  • 1
    Have deleted any file that hold by a running process, you can check by executing ''lsof | grep deleted'', and restart process if any Oct 7, 2016 at 9:38

2 Answers 2


It is possible data exists in the mount points and was hidden when the file systems were mounted.

On Linux you can show what is there with a bind mount.

mkdir /mnt/root  
mount --bind / /mnt/root 
du -s /mnt/root/*

Conveniently under here every other file system is just an empty mount point so you can just sum up everything.


The files removed by any application or any user (think rm command) do not release the space, until the file is closed by all the applications (processes) that have it open. Use lsof2 and look for deleted files, restart the applications that are keeping them open.

  • killed processes and rebooted host as well, still same!
    – Aun
    Oct 7, 2016 at 10:49

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