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DOCS-2474: mirrored mongod must be within 30 secs #2613

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DOCS-2474: mirrored mongod must be within 30 secs #2613

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12 changes: 9 additions & 3 deletions source/core/sharded-cluster-config-servers.txt
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Expand Up @@ -40,9 +40,15 @@ Replica Set Config Servers
.. include:: /includes/fact-config-server-replica-set-restrictions.rst

Earlier versions of MongoDB required *exactly three* mirrored
:program:`mongod` instances to act as the config servers. MongoDB 3.2
deprecates the use of three mirrored :program:`mongod` instances for
config servers.
:program:`mongod` instances to act as the config servers. If you are using
*mirrored* config servers, each server's system clock must be within 30
seconds of each other server for the distributed lock manager to work
properly. With *mirrored* config servers, minimize clock skew by running the
network time protocol (NTP) ``ntpd`` on your servers. MongoDB 3.2 deprecates
the use of three mirrored :program:`mongod` instances for config servers.

With replica set config servers, clock skew does not affect distributed lock
management.

Each sharded cluster must have its own config servers. Do not use the
same config servers for different sharded clusters.
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