Solutions
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seredin's post in Use an empty disk from the array to replace a failed disk was marked as the answerYou have functionally already taken one drive out of the array: the recently deceased drive. You must now add an additional drive to the array and allow that drive to be rebuilt from parity. Your "empty" drive is fully assimilated into the party maths and must be accounted for thusly. It cannot be removed until after this procedure has been followed.