Centos. Полный диск, не знаю что занимает все место и как освободить диск

Добрый день! Не могу решить проблему странного переполнения диска.
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl_vps5923-root 50G 50G 20K 100% /
devtmpfs 9.8G 0 9.8G 0% /dev
tmpfs 9.8G 0 9.8G 0% /dev/shm
tmpfs 9.8G 25M 9.8G 1% /run
tmpfs 9.8G 0 9.8G 0% /sys/fs/cgroup
/dev/vda2 1014M 141M 874M 14% /boot
/dev/mapper/cl_vps5923-home 3.6T 317G 3.3T 9% /home
tmpfs 2.0G 0 2.0G 0% /run/user/0

Папки var и usr почти пустые.
[root@vps5923 /]# du --max-depth=1 -hac
108M ./boot
0 ./dev
316G ./home
du: cannot access Б─≤./proc/31038Б─≥: No such file or directory
du: cannot access Б─≤./proc/31142/task/31142/fd/4Б─≥: No such file or directory
du: cannot access Б─≤./proc/31142/task/31142/fdinfo/4Б─≥: No such file or directory
du: cannot access Б─≤./proc/31142/fd/4Б─≥: No such file or directory
du: cannot access Б─≤./proc/31142/fdinfo/4Б─≥: No such file or directory
du: cannot access Б─≤./proc/31143Б─≥: No such file or directory
0 ./proc
41M ./run
0 ./sys
33M ./etc
132K ./root
1.5G ./var
0 ./tmp
1.4G ./usr
0 ./bin
0 ./sbin
0 ./lib
0 ./lib64
0 ./media
0 ./mnt
132K ./opt
0 ./srv
0 ./.autorelabel
4.0K ./%1
4.0K ./.rnd
4.0K ./.fmsettings
319G .
319G total
[root@vps5923 /]#