100% disk full on Centos?

Question

Can someone tell me, why is this 100% used on the /?

How can I fix this problem? I'm not a unix admin, I'm a programmer but can read the books.

Thanks, Philip

[root@datasrv /]# df Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda2 7757352 7757248 0 100% /
/dev/sda1 248895 15027 221018 7% /boot
/dev/sda9 120098680 3173944 110725656 3% /data
tmpfs 777052 0 777052 0% /dev/shm
/dev/sda5 3882508 128136 3553964 4% /home
/dev/sda7 1945132 35888 1808840 2% /tmp
/dev/sda6 7757320 4728956 2627948 65% /usr
/dev/sda3 7757352 571420 6785512 8% /var


Follow up:

I deleted some files then ran my rsync program which syncs from a windows mount share drive to a USB drive. It doesn't write to the local Centos disk as far as I know. Then suddenly the disk drive is full again, why? Does rsync do something that creates lots of files somewhere?

Answer 1

Find big files and remove them if possible:

find / -mount -size +8096 -ls
find / -mount -name core -ls
du -sh /* (and repeat for subsequent dirs on /)

Probably something is flooding your / or you have to many old kernels. Cleaning up will help, your / should be big enough because you've a seperated /var and /usr (and /data ...).

Answer 2

If you want to check filesize of every directory right in the root, you can use du -h --max-depth=1 /. It'll take quite a while.

Answer 3

Use ncdu.