root@server:/# pwd
/

root@server:/# du -ks * | sort -nr | head -10
du: cannot access `proc/1486/task/1486/fd/3': No such file or directory
du: cannot access `proc/1486/task/1486/fdinfo/3': No such file or directory
du: cannot access `proc/1486/fd/3': No such file or directory
du: cannot access `proc/1486/fdinfo/3': No such file or directory
586244784	backup
507984856	mac_volumes
943740	lib
913876	var
541792	usr
183970	boot
32752	home
8476	bin
7164	sbin
5820	etc

root@server:/# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2       916G  906G     0 100% /
udev            227M  4.0K  227M   1% /dev
tmpfs            94M  452K   94M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            235M     0  235M   0% /run/shm
/dev/sda1       461M  190M  248M  44% /boot
overflow        1.0M     0  1.0M   0% /tmp
/dev/sdb1       917G  560G  312G  65% /backup
root@server:/#