What is my space left go?

[root@localhost /]# mkdir pgdata
mkdir: cannot create directory 'pgdata': No space left on device
[root@localhost /]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 16G 0 16G 0% /dev
tmpfs 16G 0 16G 0% /dev/shm
tmpfs 16G 9.1M 16G 1% /run
tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/sda3 215G 215G 20K 100% /
/dev/sda1 1014M 232M 783M 23% /boot
tmpfs 3.2G 0 3.2G 0% /run/user/0
[root@localhost /]# du -sh *
0 bin
200M boot
0 dev
35M etc
0 home
0 lib
0 lib64
0 media
0 mnt
0 opt
du: cannot access 'proc/11357/task/11357/fd/4': No such file or directory
du: cannot access 'proc/11357/task/11357/fdinfo/4': No such file or directory
du: cannot access 'proc/11357/fd/4': No such file or directory
du: cannot access 'proc/11357/fdinfo/4': No such file or directory
0 proc
352M root
9.1M run
0 sbin
323M software
16M src
0 srv
0 sys
444K tmp
2.4G usr
850M var

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