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a60fb26
(Get the code!)
> Is this about the setup where you have two disks in raid 1 using metadata 0.90 and then grub-install to the raid device
No. This is about starting with two blank, empty disks, and ending up at a point where you can remove either of those disks and the machine will continue to boot.
On the standard ISO, it's manual partitioning, create unused partitions on two disks, assign them both to a MD device, set that MD device to be /, set both partitions active.
At that point, you can remove either device and the machine will continue to boot. This is not possible with the Live installer (please re-read my original post), or - and this is always a possibility - I was unable to find it.