# cd /
# du -hsx * | sort -rh | head -10
628G    var
38G     root
9.0G    usr
6.8G    home
689M    run
235M    lib
98M     boot
16M     bin
14M     sbin
8.4M    etc
#
# cd var 
# du -hsx * | sort -rh | head -10
626G    log
1.4G    lib
76M     cache
55M     www
2.3M    backups
60K     crash
52K     snap
32K     spool
16K     tmp
4.0K    opt
#
# cd log
# du -hsx * | sort -rh | head -10
622G    lsyncd
3.4G    syslog
504M    amazon
472M    auth.log
60M     nginx
27M     supervisor
9.2M    filebeat
7.6M    metricbeat
5.8M    apport.log
4.5M    php7-fpm.log
#
# cd lsyncd
# du -hsx * | sort -rh | head -10
622G    lsyncd.log
24K     lsyncd-status.log
12K     lsyncd.status