Installing Grub on MD Disk Partitions

I rarely have to do this, so I can never recall exactly how on those odd occasions when it does come up. Usually it’s when one of the boot disks in a server has been replaced. Anyhow, as much to remind myself as for any other reason, here’s what I do on my CentOS servers which have /boot partitions as the primary partition on both /dev/sda and /dev/sdb.

# /sbin/grub
grub> device (hd0) /dev/sda
grub> root (hd0,0) 
grub> setup (hd0)
grub> device (hd0) /dev/sdb
grub> root (hd0,0) 
grub> setup (hd0)
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