There are multiple ways to examine your system. Take a look at e.g. the output of cat /proc/diskstats and cat /proc/devices or read through dmesg to see what hardware is found at boot-time. Or dive into /proc/scsi or /proc/ide where your devices appear.
Hardware RAID is not visible at the software level as multiple hardware devices appear as a single one. Access to the individual hardware devices is shielded by the RAID hardware. On the contrary, you would access software RAID via a special device file, /dev/mdX (where X is a number) and would see information about it in e.g. cat /proc/mdstat and would still see the individual drives, too. With Red Hat Linux, you would also see loaded software RAID kernel modules when running /sbin/lsmod.
So much for the beginning.
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