I performed a test install of CentOS Beta 5 on a system with two ~60 GB drives. When installing CentOS 4 on this system, I normally work thru setting up Software RAID with identically sized partitions on each drive. For my test, the CentOS installer only presented a single drive. I took the default of letting it do what it wanted. After looking over the system I have verified that /boot is using DMRAID, but it isn't not clear if the balance of the drive for the root file system is using both drives or not, I think it might be. Using fdisk, I can see both disks are carved out identically: Device Boot Start End Blocks Id System /dev/hda1 * 1 13 104391 83 Linux /dev/hda2 14 7297 58508730 8e Linux LVM /dev/hdd1 * 1 13 104391 83 Linux /dev/hdd2 14 7297 58508730 8e Linux LVM Using dmraid it *looks* like the drives are mirrored in total? dmraid -r -D /dev/hda: pdc, "pdc_bacfgfjaf", mirror, ok, 117231345 sectors, data@ 0 /dev/hdd: pdc, "pdc_bacfgfjaf", mirror, ok, 117231345 sectors, data@ 0 But then using df it is less obvious: df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 54G 1009M 50G 2% / /dev/mapper/pdc_bacfgfjafp1 99M 11M 83M 12% /boot tmpfs 125M 0 125M 0% /dev/shm pvs shows VolGroup00 as using pdc_bacfgfjafp2: PV VG Fmt Attr PSize PFree /dev/mapper/pdc_bacfgfjafp2 VolGroup00 lvm2 a- 55.78G 32.00M which is RAID1?????? Seems to be: dmraid -s *** Active Set name : pdc_bacfgfjaf size : 117231232 stride : 128 type : mirror status : ok subsets: 0 devs : 2 spares : 0 Am I properly understanding that by default, CentOS 5 is creating a full drive mirrored RAID? Then for other than the boot partition, it is laying LVM over this mirrored RAID, presumably to allow adjustments later? Thank you in advance, Brett