update-grub
grub-install /dev/sda
grub install /dev/sdb
and then reboot.  The grub prefix (set command from the grub shell on booting) 
is still (md0)/grub!
Hmmmm??  /etc/grub.d/00_header has

..
transform="s,x,x,"
..
..
..
..
grub_prefix=`echo /boot/grub | sed ${transform}`
..

Is that where the grub "prefix" gets set?

-- 
grub2 shows 'biosdisk read error', then boots
https://bugs.launchpad.net/bugs/396564
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