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Recently I had the need to install CentOS 7 on an old machine to be used as a simple firewall. The problem I faced was that the RAID controller (IBM ServeRAID 5) of that old server was not suported anymore by Red Hat Enterprise Linux (RHEL) and by that, by CentOS kernels. The driver is part of the kernel version of CentOS 7 but Red Hat disable it for support reasons.