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I have a Linux machine with two SSD drives as its main drive. While installing Ubuntu 20 or CentOS 8, I partitioned the drives each with a 2g boot partition and the rest as a root partition, then used MDADM to raid them together as raid1.

They appear to have the same content, but I can only directly boot off of one of them. Booting fails when I direct the boot loader to the other drive. Is there a diagnostic tool I can use to identify why I can't boot to the other drive?

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  • Booting fails when I direct the boot loader to the other drive → Please provide boot log or error message
    – rzlvmp
    Commented Dec 23, 2021 at 2:04
  • There is no boot log. All i get when I attempt to boot to that disk is a cursor flashing on a blank screen.
    – Robert Rapplean
    Commented Dec 24, 2021 at 18:45

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