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  • Thanks. Yes, /dev/sdb (and a) are just one single partition (/dev/sdb1). Start is 2048 and size is 7814035087. Would you mind with further instructions on recreating the partition table? Commented Aug 17, 2020 at 8:20
  • Oh - and how will the array be affected by this? Commented Aug 17, 2020 at 8:23
  • @LukePittman in that case try parted --align=none /dev/sdb, unit s, print free, mklabel gpt, mkpart md4-b 2048s 7814037134s, print free, quit - if the partition is created correctly, the array won't be affected at all — sorry, I can't advise regarding sgdisk as I'm not too familiar with it Commented Aug 17, 2020 at 10:14
  • Thank you! Unfortunately I don't have quite enough confidence in how this will turn out after reboot, so I've decided to deploy another server and migrate the data. Once that's done I shall try this so I can learn though. Cheers. Commented Aug 17, 2020 at 18:38