This is exactly how it should be on a hardware RAID controller ... Windows (any OS) will be oblivious to the number of drives or RAID configuration.  The RAID controller configures the drives in a logical (or virtual) drive that it then presents Windows with. If you want to see your RAID configuration, status, and member disks, then you need to install OpenManage Server Administrator.
first-time doing anything like this...I'm bringing an old Dell PowerEdge 2850 back to life.  Installed (2) 4gb sticks of RAM, (2) identical Maxtor Ultra 320 SCSI 140gb Hard Drives.  Ran  the PERC/CERC Bios Configuration Utility a. Both drives are recognized. Configured drives for RAID 1.  On boot-up, screen reads (1) Logical Drive(s) found on the host adapter, (1) Logical Drive(s) handled by BIOS.  Both drives show (2) green lights on front.  During install of Windows Server 2003, only Drive 0 shows up.  When OS install was done, I went to Start > Administrative Tools > Computer Management> Disk Management. All I see is Drive 0 and my CD-ROM. I don't see Drive 1.  Is this how it should be? I assumed I would see both drives. Thank you in advance for your assistance and I apologize for my lack of experience and knowledge. 
raid 1 configuration