Cannot mount hardware RAID1 in fstab

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http://forums.fedoraforum.org – I am using Fedora KDE 19 64 bits The problem is: I can manually mount the raid array when I am logged in, but when I had a line in fstab to auto mount it at boot, it fails (when booting, the system falls into maintenance mode). In maintenance mode, once I entered the root password, I do "mount -a" and the raid array is mounted without any problem. here is my fstab, but I doubt anything is wrong with it as "mount -a" works in maintenance mode. Code: UUID=20e6266a-72bf-4b97-9791-a216ee989f91    /          ext4    d (HowTos)