The quiz answer details, “For a 7-member replica set, the answer is always 4. The arbiter and the delayed secondary don’t change that fact.” I understand that an arbiter is not a data-bearing member and thereby would not be considered in ‘majority calculations’. As such, the total number of members in the majority is 6. If correct, there is an error in the quiz.
The strict majority of
n data-bearing voting members required to acknowledge a
majority write concern is
With 6 data-bearing members in a replica set configuration, the write concern majority is 4 (
6/2 + 1). With a maximum of 7 voting members in a replica set, 4 is also the highest write majority possible at the moment.
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