/dev/mapper/cos-root is 53%

[Tero]

What is /dev/mapper/cos-root ? I am not sure why this keeps happening. /home is far from full, where all user data is stored. I clear out /tmp with tmpwatch, I removed old logs in /var/log and any unnecessary files.

Code:

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/cos-root  400G  210G  191G  53% /
devtmpfs              9.8G     0  9.8G   0% /dev
tmpfs                 9.8G     0  9.8G   0% /dev/shm
tmpfs                 9.8G 1009M  8.8G  11% /run
tmpfs                 9.8G     0  9.8G   0% /sys/fs/cgroup
/dev/sda1             243M  187M   43M  82% /boot
tmpfs                 2.0G     0  2.0G   0% /run/user/0

Code:

[root@test /]# du -sh /*
0       /bin
186M    /boot
0       /dev
91M     /etc
0       /home
0       /lib
0       /lib64
0       /media
0       /mnt
0       /opt
du: cannot access ‘/proc/6095/task/6095/fd/4’: No such file or directory
du: cannot access ‘/proc/6095/task/6095/fdinfo/4’: No such file or directory
du: cannot access ‘/proc/6095/fd/4’: No such file or directory
du: cannot access ‘/proc/6095/fdinfo/4’: No such file or directory
0       /proc
68K     /root
1009M   /run
0       /sbin
0       /srv
0       /sys
4.0K    /tmp
1.6G    /usr
208G    /var
4.0K    /test

[NitroxydeX]

because /var has 208GB. It's where Sentora stores the Hostdata, Backups and Temp. So Maybe you didn't updated your backup-module and it creates just dump on your disk.

/dev/mapper/cos-root seems to be your entire partition. Like others have md1 or sda1 and so on.