How do I install driver for LSI MegaRAID controller

The binary driver megasr.ko will not work with CloudLinux kernel due to ABI changes. You would need to compile it from the source: Install kernel-devel package via:

yum install kernel-devel

If you have PAE, Xen or enterprise kernel, use:

yum install kernel-PAE-devel, yum install kernel-xen-develor yum install kernel-ent-devel

Download version of the driver for RedHat 5 (not current version). Here is the URL

Extract the zip file, then cd to shim/library/rhel5-32 do

 make -C /usr/src/kernels/ M=$PWD

copy the megasr.ko to /lib/modules//updates

depmod
/sbin/mkinitrd /boot/initrd-.img

Reboot