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Assuming that the sdaX and sdbX partitions are mounted as RAID devices (ie, md126, md127, etc), you can just tell grub-install to install GRUB2 on whatever devices or partitions you want. GRUB2 is aware enough of mdraid metadevices to do the right thing. What's important here is that your /boot file system is also a RAID device of some sort or that you manually replicate everything across all of your replicas. In one of my specific cases I have 4 disks, two partitions per disk. sdX1 (/dev/md126, RAID1, 4 replicas) are small partitions for /boot, sdX2 (/dev/md127, RAID10) are allocated to LVM2. GRUB2 is automatically installed on sda1 and I've manually installed it on sd[bcd]1. GRUB and Linux don't care. I would still test to make sure that the system can boot from other devices. It should work but some BIOS and EFI implementations are more dodgy than others. -- Rich P.
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