They are also different in cost, performance and access speeds. Im not aware of support in Grub to declare two disks as. The key difference between software RAID and hardware RAID is that software in the OS manages the former, while controllers independent from the OS manage the latter. Make sure that your Grub configuration doesnt hard-code disks like (hd0), but instead searches for the boot and root filesystems UUIDs. Then both drives will be able to boot alone. To make full use of software RAID, you need to learn about disk failures so you don't end up loosing two disks from your 3 disk RAID-5 just because you don't notice failure of the first one. If the two disks are /dev/sda and /dev/sdb, run both grub-install /dev/sda and grub-install /dev/sdb.
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