CentOS List wrote:
It might be easier to swap the old sdb into the sda position so you'll boot from it, but you should also be able to boot the install cd with
If swapped and booted, and got a kernel panic error.
What does it complain about?
<snip> mounting root filesystem cfs: can't find ext3 filesystem on dev md2 mount: error 22 mounting ext mount: error 22 mounting none switching to new root switchroot: mount failed: 22 unmount /initrd/dev failed: 2 Kernel panic - not syncing: attempted to kill init!
From the rescue mode boot, can you mount either /dev/md2 or the underlying /dev/sd?2 from either of the disks. If not, the raid isn't your problem, it is the contents of the partition.
# mount /dev/md2 /mnt/part3 mount: Mounting /dev/md2 on /mnt/part3 failed: Invalid argument
What about the /dev/sda2 or /dev/sdb2 that was the original disk? If you can't mount the filesystem from there, I think the contents either weren't what you thought (the raid wasn't working before the other drive failed) or something you have done since has damaged it.