I am trying to install CentOS 5.2 32-bit and CentOS 5.2 64-bit on the same server. The server has two pairs of mirrored drives (using Dell PERC 5/i hardware based RAID). One paired of mirrored drives is labeled sda and the other is labeled sdb. I have installed the 32-bit version using only sda and vice versa. I am using the GRUB boot loader. It doesn't seem to matter what order I install the different version. Whichever one I install second won't boot. It will show up on the boot loader menu, but when I select it I receive this error message:
Error 13: Invalid or unsupported executable format
Can someone please provide some guidance on setting this up properly.