# In a 3 node Cluster, having 2 data nodes and 1 node without data but this node having much less CPU and RAM resources, will compromise my overall performance?

**URL:** <https://discuss.elastic.co/t/in-a-3-node-cluster-having-2-data-nodes-and-1-node-without-data-but-this-node-having-much-less-cpu-and-ram-resources-will-compromise-my-overall-performance/240775>\
**Category:** Elasticsearch\
**Created:** [July 11, 2020, 2:14am UTC](https://discuss.elastic.co/t/in-a-3-node-cluster-having-2-data-nodes-and-1-node-without-data-but-this-node-having-much-less-cpu-and-ram-resources-will-compromise-my-overall-performance/240775 "2020-07-11T02:14:55Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![spdoes](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@spdoes](https://discuss.elastic.co/u/spdoes)\
**Post date:** [July 11, 2020, 2:14am UTC](https://discuss.elastic.co/t/in-a-3-node-cluster-having-2-data-nodes-and-1-node-without-data-but-this-node-having-much-less-cpu-and-ram-resources-will-compromise-my-overall-performance/240775/1 "2020-07-11T02:14:55Z")

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In a 3 node Cluster, having 2 data nodes and 1 node without data but this node having much less CPU and RAM resources, will compromise my overall performance ?

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**Author:** ![rugenl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rugenl/32/12887_2.png) [@rugenl](https://discuss.elastic.co/u/rugenl)\
**Post date:** [July 11, 2020, 3:10am UTC](https://discuss.elastic.co/t/in-a-3-node-cluster-having-2-data-nodes-and-1-node-without-data-but-this-node-having-much-less-cpu-and-ram-resources-will-compromise-my-overall-performance/240775/2 "2020-07-11T03:10:44Z")

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What is function of the non-data node?

In my experience, such nodes, make much lower demands on resources, but I'm not sure how to forecast what they will need. We had a non-elected master node that started showing low memory. I think the cluster config had grown to where it's ram/heap wasn't adequate.

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**Author:** ![spdoes](https://avatars.discourse-cdn.com/v4/letter/s/a698b9/32.png) [@spdoes](https://discuss.elastic.co/u/spdoes)\
**Post date:** [July 11, 2020, 3:29pm UTC](https://discuss.elastic.co/t/in-a-3-node-cluster-having-2-data-nodes-and-1-node-without-data-but-this-node-having-much-less-cpu-and-ram-resources-will-compromise-my-overall-performance/240775/3 "2020-07-11T15:29:05Z")

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the only reason for the non-data node is to form a 3 node cluster, which is the minimum recommended.  
makes sense ?

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**Author:** ![rugenl](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rugenl/32/12887_2.png) [@rugenl](https://discuss.elastic.co/u/rugenl)\
**Post date:** [July 11, 2020, 5:31pm UTC](https://discuss.elastic.co/t/in-a-3-node-cluster-having-2-data-nodes-and-1-node-without-data-but-this-node-having-much-less-cpu-and-ram-resources-will-compromise-my-overall-performance/240775/4 "2020-07-11T17:31:40Z")

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Yes, and on recent versions, you could make it a "voting only" master and it would need even less resources.

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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:** [August 8, 2020, 5:31pm UTC](https://discuss.elastic.co/t/in-a-3-node-cluster-having-2-data-nodes-and-1-node-without-data-but-this-node-having-much-less-cpu-and-ram-resources-will-compromise-my-overall-performance/240775/5 "2020-08-08T17:31:42Z")

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Closed on August 8, 2020, 5:31pm UTC

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