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Some general comments. You've disabled SMART on both your disks (or at least, you've not enabled it). No tests are being run and none has been run previously. This tells me that there is no way you can know whether or not the disk is faulty. The kernel error message, Add. Sense: Unrecovered read error - auto reallocate failed suggests that the disk is well ...


Thanks to @casey for the comments! After running the parted and gdisk commands, it is clear that the disks are healthy so I don't know why the array fails on startup. A colleague recommended running: partprobe /dev/sdb I did that and then reran the mdadm commands and now mdadm can see sdb mdadm -E /dev/sdb /dev/sdb: MBR Magic : aa55 Partition[0] : ...

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