I've two machines with almost identical hardware (slightly different CPUs). The SATA/RAID controller is SiI 3114. One of the servers was installed a while ago by someone else, it's running Fedora Core 5 and RAID is enabled: # df -m Filesystem 1M-blocks Used Available Use% Mounted on /dev/dm-6 125931 2990 116441 3% / /dev/dm-1 99 13 81 14% /boot tmpfs 1012 0 1012 0% /dev/shm /dev/dm-2 9917 151 9254 2% /tmp /dev/dm-3 9917 237 9168 3% /var # cat /etc/modprobe.conf | tail -n 1 alias scsi_hostadapter sata_sil I installed CentOS 4.4 64bit on the other system, but I could not enable RAID. The installer was always seeing 2 separate drives instead of one RAID device. Was it my mistake? Did I not enable the proper settings in the BIOS? (I tried quite a few different settings) Or is it perhaps that the CentOS kernel does not have the proper drivers to support SiI 3114 in RAID mode? -- Florin Andrei http://florin.myip.org/