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lines changed Original file line number Diff line number Diff line change @@ -14,8 +14,14 @@ A :term:`shard` contains a subset of sharded data for a :term:`sharded
1414cluster`. Together, the cluster's shards hold the entire data set for the
1515cluster.
1616
17- As of MongoDB 3.6, shards must be deployed as a :term:`replica set` to
18- provide redundancy and high availability.
17+ Shards must be deployed as a :term:`replica set` to provide redundancy and high
18+ availability.
19+
20+ .. important::
21+
22+ Sharded clusters use the write concern ``"majority"`` for a lot of internal
23+ operations. Using an arbiter in a sharded cluster is discouraged due to
24+ :ref:`replica-set-arbiter-performance-psa`.
1925
2026Users, clients, or applications should only directly connect to a shard to
2127perform local administrative and maintenance operations.
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