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.
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
On Wed, 11 Apr 2007 at 11:32am, Ashley M. Kirchner wrote
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.
FAQ.
http://linux-ata.org/faq-sata-raid.html
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Ashley M. Kirchner -
Joshua Baker-LePain -
Matt Hyclak