I've recently come across a thread in the CentOS forums [0] regarding the solution to getting hardware requiring the cciss driver, such as HP ProLiant G5 systems, to install and boot with CentOS 7. The thread was a start in the right direction, but I believe I've determined a better workflow and feel that it would benefit the community to have this published either in the release notes or on the Wiki. On a system containing an older HPSA (HP Smart Array) adapter, the following will allow CentOS and/or RHEL 7 to boot and install without requiring any special drivers. When booting from the installation media, hit <tab> to edit the boot command. Add these two keys to the kernel options, and continue to boot and install the operating system as normal: hpsa.hpsa_simple_mode=1 hpsa.hpsa_allow_any=1 On the first reboot after installation, hit <e> to edit the boot command when you are presented with the grub selection menu. Scroll down to the line containing the vmlinuz reference, and add those same two keys to the end of the line. Once the system is booted, edit /etc/default/grub and add those two keys to the "GRUB_CMDLINE_LINUX=" line. It should look like this: GRUB_CMDLINE_LINUX="rd.lvm.lv=centos_boot/swap \ rd.lvm.lv=centos_boot/root crashkernel=auto \ hpsa.hpsa_simple_mode=1 hpsa.hpsa_allow_any=1 \ rhgb quiet" After the grub default is modified, run the following command, and proceed as you normally would. Your system will now operate through all kernel updates with the HPSA adapter. grub2-mkconfig -o /boot/grub/grub.cfg [0] https://www.centos.org/forums/viewtopic.php?f=49&t=47011 -- Dan Mossor, RHCSA Systems Engineer Fedora Server WG | Fedora KDE WG | Fedora QA Team FAS: dmossor IRC: danofsatx San Antonio, Texas, USA