Do that step by step:

pico /scripts/securetmp
Modify "my $tmpdsksize"

service mysql stop
service httpd stop
pstree -p | grep tailwatchd
then kill the processes
umount /var/tmp
fuser -cu /tmp
then kill all processes appears to you
umount /tmp
rm -rf /usr/tmpDSK
/scripts/securetmp --auto
service mysql start
service httpd start

reboot -n

Done