Comment 1 for bug 1466150

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Phillip Susi (psusi) wrote : Re: Feature request: For EFI system grub-install should be able to install to multiple disks

Choice of filesystem has nothing to do with raid. You can put any FAT32 partition, including the ESP, on a raid1 if you want. You just need to make sure to use md format 0.9 or 1.0 instead of 1.1 or 1.2 so the firmware will still recognize it.