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DOCS-9127: clarifies that arbs make for uneven num of voting members #2739

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DOCS-9127: clarifies that arbs make for uneven num of voting members #2739

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14 changes: 7 additions & 7 deletions source/core/replica-set-arbiter.txt
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Expand Up @@ -18,17 +18,17 @@ Replica Set Arbiter
An arbiter does **not** have a copy of data set and **cannot** become
a primary. Replica sets may have arbiters to add a vote in
:ref:`elections of for primary <replica-set-elections>`. Arbiters
*always* have exactly ``1`` vote election, and thus
allow replica sets to have an uneven number of members, without the
overhead of a member that replicates data.
*always* have exactly ``1`` election vote, and thus
allow replica sets to have an uneven number of voting members without the
overhead of an additional member that replicates data.

.. important:: Do not run an arbiter on systems that also host the
primary or the secondary members of the replica set.

Only add an arbiter to sets with even numbers of members. If you add
an arbiter to a set with an odd number of members, the set may suffer
from tied :term:`elections <election>`. To add an arbiter, see
:doc:`/tutorial/add-replica-set-arbiter`.
Only add an arbiter to sets with even numbers of voting members. If you
add an arbiter to a set with an odd number of voting members, the set
may suffer from tied :term:`elections <election>`. To add an arbiter,
see :doc:`/tutorial/add-replica-set-arbiter`.

.. end-content

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