Hello,

I am trying to install CentOS 6 on a new Dell Server made for RHEL 6. I am have a problem installing the boot loader on to the software RAID device /dev/md0. When I have done so the machine won't boot. I have read other threads here and posts on other websites that indicate that one must install the boot loader on /dev/sda during installation then run commands at the grub prompt in order to install the boot loader on both drives in the RAID 1 mirror. I've followed those instructions but cannot get the machine to boot when I simulate a disk failure.

I've been running CentOS 5 for years and have installed the boot loader on /dev/md0 on that platform, and on many, many machines, with absolutely no problems. With real and simulated disk failures the machines always boot.

Is there something to a CentOS 6 installation that I'm not taking into account in setting up a bootable software RAID 1 device? Can anyone help me figure this out?