On Mon, 30 Mar 2015 19:42:05 -0400, Stephen wrote:

16G/swap 500MB/boot 80G/home 50G/root

800G/sdb

will not install Grub bootloader Fatal error

Um, this is JBOD, and not RAID1.

Raid1 would be 2x drives (sda & sdb) appearing as one single drive to the OS. Data is byte for byte mirrored between them.