I have a server that was previously setup with Software RAID1 under CentOS 5.5 (/dev/sda and sdb). I added two additional drives to the server and was attempting re-install CentOS. The CentOS installer sees the 2 new drives fine (sdc and sdd), however it does not see the the two original drives sda and sdb as individual drives. Instead it only shows Drive /dev/mapper/pdc_... (Model: Linux device-mapper). Basically what I need to do is strip all RAID configurations off these drives and allow the installer to see them as individual physical disks.
I've tried pulling all the drives except one of the original ones, installing a minimal CentOS and running dmraid -r -E, but it still sees the old RAID partition. None of the CentOS install options (remove previous partitions, etc) seem to work.
Thanks in advance