My problem has been resolved after I upgrade the bios of my motherboard. (also updated LSI raid controller firmware)
And FOR RAID 5, 9240-8i is not a good card RAID 5 speed is very slow and I plan to either get a new card or build a raid 10 disks,
as I googled 9240-8i has no cache so if you us RAID 5 it will be a bad idea.