On Wed, Apr 11, 2007 at 11:32:22AM -0600, Ashley M. Kirchner enlightened us: > I have a machine that's been configured as follows using its BIOS tools: > > SATA-0 is a 160 GiB drive used as boot > SATA-1 and SATA-2 are both 500 GiB drives and were configured as a > RAID-1 in BIOS. > > When the system boots up, BIOS reports 1 160 GiB SATA drive, and 1 > Logical volume as RAID-1 ID#0 500 GiB, which is what I would expect it > to report, as the two drives are now raided together. > > However, when I boot into the Centos installer and I get to > configuring the partitions, it lists both sda, sdb, and sdc as > available. Both sdb and sdc are 500 GiB. I would've expected to only > see one drive for the RAID setup. > > Can someone explain why I see both drives and how am I supposed to > configure them? I thought if I configured the BIOS to raid them, I > wouldn't have to do anything in the OS other than to format the thing > and expect it to work. You would be able to do that if you were using a real RAID card, but the crap that comes on your motherboard is nothing more than a fancy hardware interface to software drivers that do the RAID. See http://en.wikipedia.org/wiki/FakeRAID for more details. Your best bet is to either get a real hardware RAID card (3ware, etc.) or to use the software RAID built into linux (md). Matt -- Matt Hyclak Department of Mathematics Department of Social Work Ohio University (740) 593-1263