I have followed the procedure on the Centos page: http://wiki.centos.org/HowTos/CentOS5ConvertToRAID My setup is slightly different. I am using two partitions, / and /home. I have setup swap as a file, /home/swapfile. My hard drives are 500Gig sda and sdb. In modifying the instructions for initializing sdb I have: used /dev/md0 for / (sdb1) used /dev/md1 for /home (sdb2) In section 3.6 The line: mount /dev/RaidSys/Root /mnt/root.new was changed to mount /dev/md0 /mnt/root.new Everything seems to go well until I get to section 4.4.1/4.4.2 Install grub. The commands for installing grub show success but when I edit the /mnt/root.new/boot/grub/menu.lst the contents still point to hd0 not hd1. In section 4.4.4 I am not sure how the following should be changed: umount /mnt/boot.new mount /dev/md0 /mnt/root.new/boot The umount is not needed in my case but should the second line be: mount /dev/md0 /mnt/root.new Other info I have found includes creating a /etc/mdadm.conf. This is not referred to in the instructions. Are the changes I have made correct? Am I missing any other changes? Thanks for any help, David