Rootdisk full but can't find why

Hi,

My root-disk shows as 99% full. I found out my log file was 43 GB big, so I deleted obsolte logs clearing over 40 GB in data (must enable logrotation ;o). But after that it still shows 99% full

[xxx /]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos_37--97--189--250-root 50G 50G 6.8M 100% / devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 8.5M 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/vda1 497M 236M 262M 48% /boot /dev/mapper/centos_37--97--189--250-home 246G 18G 229G 8% /home tmpfs 783M 0 783M 0% /run/user/1000 tmpfs 783M 0 783M 0% /run/user/525 tmpfs 783M 0 783M 0% /run/user/0

But when I try to find the big directories it doesn't return anything out of the ordinary: [**1 /]# du --max-depth=1 -m -x -h / 44M /etc 7.0M /root 12K /tmp 9.8G /var 2.0G /usr 0 /media 0 /mnt 0 /opt 0 /srv 416K /backups 12G /

Any advice is appreciated!