SERVER QUESTION

Per the images below, I have two questions.  Can some one tell me what raid system/array I have set up on this server. The server has three 8 gig hard drives. I want to make sure the primary drive is being constantly mirrored and if it fails, the mirrored drive with immediately take over.  The other question I have is that I constantly have to go into configuration set up every time the system is turned on to set up the clock, etc.  Does this mean that the CMOS battery needs to be replaced on the mother board and if so, where is it and what is the replacement battery. Thanks