Dell SUU (Server Update Utility) is a tool provided as an ISO from Dell that runs on windows and linux to search for drivers and firmware updates. In 32bit CentOS/RHEL SUU runs without problems however in 64bit correct pre-reqs are required for SUU to work correctly. SUU manual is located here.
yum -y install glibc.i686 compat-libstdc++-33.i686 libstdc++.i686 zlib.i686 libxml2.i686 libXp.i686 libXtst.i686 ncurses-libs pam.i686 procmail
mount the ISO. you can do this 2 ways. #1 using virtual media in the IDRAC or #2 loop mounting the iso from the OS after transferring the ISO to the OS.
Check for updates
once the update is done REBOOT.