There's no option in BIOS to disable the RAID mode; this is NEC servers !! Also; I have found that it's a bug in Centos 7 as per this pages:- https://www.centos.org/forums/viewtopic.php?t=49069 https://bugs.centos.org/view.php?id=9813 From: Fawzy Ibrhim <fawzy_ibrhim at yahoo.com> To: CentOS mailing list <centos at centos.org> Sent: Wednesday, August 17, 2016 5:41 PM Subject: Re: [CentOS] LSI SATA MegaRaid & Centos 7 build 1511 dmesg output has been pasted to http://paste.fedoraproject.org/409669/47144402/