# Minimum number of Coordinating nodes

**URL:** <https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612>\
**Category:** Elasticsearch\
**Created:** [May 4, 2017, 6:28pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612 "2017-05-04T18:28:12Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![mruthyu](https://avatars.discourse-cdn.com/v4/letter/m/bb73d2/32.png) [@mruthyu](https://discuss.elastic.co/u/mruthyu)\
**Post date:** [May 4, 2017, 6:28pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/1 "2017-05-04T18:28:12Z")

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Would like to know the recommended number ( 2 or 3) of coordinating only nodes for an elasticsearch cluster which will have around 4.5 TB of data.

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [May 4, 2017, 6:32pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/2 "2017-05-04T18:32:58Z")

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You don't necessarily need any coordinating nodes at all. Sometimes one is used together with Kibana, but many deployments do fine without them.

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**Author:** ![mruthyu](https://avatars.discourse-cdn.com/v4/letter/m/bb73d2/32.png) [@mruthyu](https://discuss.elastic.co/u/mruthyu)\
**Post date:** [May 4, 2017, 6:37pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/3 "2017-05-04T18:37:18Z")

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Thanks. We are planning to use the coordinating nodes along with Kibana and question is whether to use 2 or 3.

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [May 4, 2017, 6:37pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/4 "2017-05-04T18:37:54Z")

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How many Kibana instances will you have?

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**Author:** ![mruthyu](https://avatars.discourse-cdn.com/v4/letter/m/bb73d2/32.png) [@mruthyu](https://discuss.elastic.co/u/mruthyu)\
**Post date:** [May 4, 2017, 6:38pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/5 "2017-05-04T18:38:34Z")

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Each coordinating node will have one Kibana instance.

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [May 4, 2017, 6:40pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/6 "2017-05-04T18:40:01Z")

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Dedicated master nodes should always be 3 in order to be able to reach consensus even with a node missing. That is not an issue for coordinating nodes, so 2 is most likely sufficient.

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**Author:** ![mruthyu](https://avatars.discourse-cdn.com/v4/letter/m/bb73d2/32.png) [@mruthyu](https://discuss.elastic.co/u/mruthyu)\
**Post date:** [May 4, 2017, 6:50pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/7 "2017-05-04T18:50:04Z")

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Thanks. Whether 2 coordinating nodes are always sufficient irrespective of the data volume? (50TB or 100TB..etc) Also what is the typical resource configuration - CPU cores, RAM and disk space for coordinating nodes.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 1, 2017, 7:00pm UTC](https://discuss.elastic.co/t/minimum-number-of-coordinating-nodes/84612/8 "2017-06-01T19:00:39Z")

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