If Onload was installed from a source RPM, it might also be necessary to remove installed RPM packages:
rpm -qa | grep 'enterpriseonload' | xargs rpm -e
rpm -qa | grep 'cloudonload' | xargs rpm -e
rpm -qa | grep 'onload' | xargs rpm -e
rpm -qa | grep 'sfc' | xargs rpm -e
rpm -qa | grep 'sfutils' | xargs rpm -e
onload_uninstall