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I'm rookie of ubuntu even linux. My disk topology as below enter image description here

Now my boot in sda1 and can open OS during raid and sda only. my question is can I put boot in sdb1 and can open OS during raid and sdb only? I try copy all sda1 data to sdb1 via dd, but still can not open via sdb1, do I miss some step? or I just need to modify grub? If yes, how to modify?

Thanks!

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