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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
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cluster`. Together, the cluster's shards hold the entire data set for the
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cluster.
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- As of MongoDB 3.6, shards must be deployed as a :term:`replica set` to
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- provide redundancy and high availability.
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+ Shards must be deployed as a :term:`replica set` to provide redundancy and high
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+ availability.
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+
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+ .. important::
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+
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+ Sharded clusters use the write concern ``"majority"`` for a lot of internal
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+ operations. Using an arbiter in a sharded cluster is discouraged due to
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+ :ref:`replica-set-arbiter-performance-psa`.
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Users, clients, or applications should only directly connect to a shard to
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perform local administrative and maintenance operations.
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