On 1/10/19 10:20 AM, Simon Matter via CentOS wrote: >>> RAID1 is going to have type FD00 (Linux RAID) whereas EFI firmware >>> expects type EF00 (EFI System Partition) to boot from. >> I think you're referring to MBR partition types. I'm not certain, but I >> don't see those values in a GPT. > No, it's GPT. What does "gdisk -l /dev/sda" show? That would be > interesting to see. If you're looking for the "code" column, they're all 0700. See the man page for gdisk. The section describing the "l" command clarifies: For ease of data entry, gdisk compresses these into two-byte (four-digit hexadecimal) values that are related to their equivalent MBR codes. ... Note that these two-byte codes are unique to gdisk. The codes printed by gdisk don't actually appear in the GPT. > OK I see. Do you also have /boot mounted on its own MD device? Yes.