Today I found out that I have full root partition. The reason was, that I had made a several stupid things with my MySQL databases. File /var/log/apache2/error-log occupied 18% of root partition. Removed the file and for sure moved /var directory to other partition and created symlink. Now the situation is like that:
localhost / # df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_sabayon-lv_root 40994128 31082832 7828892 80% /
udev 10240 4 10236 1% /dev
tmpfs 4071624 1232 4070392 1% /run
shm 4071624 516 4071108 1% /dev/shm
cgroup_root 10240 0 10240 0% /sys/fs/cgroup
/dev/sdb2 104806384 40170320 64636064 39% /windata
/dev/sdb3 104806400 21101420 83704980 21% /data
/dev/sdb5 52403184 19081712 33321472 37% /fatdata
/dev/sdb7 495844 49782 420462 11% /boot
I remeber, that some year ago root partition occupied up to 60%. What else could I safely remove?