/dev/hda3 (/usr) free space issue

[PhilipAlv]

This is the output i get when i type in df -h

/dev/hda5 7.8G 3.5G 4.0G 47% /
/dev/hda8 45G 4.2G 38G 10% /home
/dev/hda6 996M 34M 911M 4% /tmp
/dev/hda3 7.8G 4.4G 3.0G 60% /usr
/dev/hda2 9.7G 1.2G 8.1G 13% /var
/dev/hda1 122M 17M 100M 14% /boot
none 1014M 0 1014M 0% /dev/shm

du -ksh /usr/local/apache/logs/ output is

449M /usr/local/apache/logs/

it used to be 2.5 G two weeks ago.the size came down after log rotation was enabled

du -ksh /usr/local/cpanel/logs/ output is

7.4M /usr/local/cpanel/logs/

du /usr -k | sort -rn | head -10 output is

4487604 /usr
2682032 /usr/local
1359988 /usr/local/apache
1101168 /usr/local/cpanel
868200 /usr/local/apache/domlogs
762460 /usr/share
569148 /usr/lib
459580 /usr/local/apache/logs
294264 /usr/local/cpanel/src
293160 /usr/local/cpanel/src/3rdparty

here is my question.what can i do to increase the free space on /usr.log rotation is enabled in whm.

thanks