Here are the steps for resizing /tmp in cpanel. Execute the following commands so that /tmp is freed with resources..
service chkservd stop
service httpd stop
service mysql stop
service postgresql stop
umount /tmp
If it’s still coming up busy, you need to find out what processes have files open on it:
lsof | grep /tmp
You’ll need to kill off any processes listed. When you’re done, restart the services you killed and:
umount /var/tmp
umount /tmp
replace “256000″ “512000″ — /scripts/securetmp
rm /usr/tmpDSK
/scripts/securetmp
cd /tmp
ln -s /var/lib/mysql/mysql.sock
service postgresql start
service mysql start
service httpd start
service chkservd start