# Node config for split-brain avoidance

**URL:** <https://discuss.elastic.co/t/node-config-for-split-brain-avoidance/202386>\
**Category:** Elasticsearch\
**Created:** [October 4, 2019, 8:05pm UTC](https://discuss.elastic.co/t/node-config-for-split-brain-avoidance/202386 "2019-10-04T20:05:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![smlbiobot](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/smlbiobot/32/29622_2.png) [@smlbiobot](https://discuss.elastic.co/u/smlbiobot)\
**Post date:** [October 4, 2019, 8:05pm UTC](https://discuss.elastic.co/t/node-config-for-split-brain-avoidance/202386/1 "2019-10-04T20:05:09Z")

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We are currently running an ES cluster with 5 nodes in this config, with minimum\_master\_node sets to 2 and having only 3 nodes be master-eligible

- A: Master + Data
- B: Master + Data
- C: Master + Data
- D: Data
- E: Data

As we are running out of space, I would like to add another Data node and potentially more in the future. I want to make sure that it won’t become an issue with the Master-eligible nodes always set to 3 and just add Data nodes as required.

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**Author:** ![jasontedor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jasontedor/32/66992_2.png) [@jasontedor](https://discuss.elastic.co/u/jasontedor)\
**Post date:** [October 5, 2019, 12:30pm UTC](https://discuss.elastic.co/t/node-config-for-split-brain-avoidance/202386/2 "2019-10-05T12:30:50Z")

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Your setup is fine, and adding additional data nodes (but not master-eligible nodes) will be fine.

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**Author:** ![smlbiobot](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/smlbiobot/32/29622_2.png) [@smlbiobot](https://discuss.elastic.co/u/smlbiobot)\
**Post date:** [October 5, 2019, 12:53pm UTC](https://discuss.elastic.co/t/node-config-for-split-brain-avoidance/202386/3 "2019-10-05T12:53:49Z")

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Thanks — good to know!

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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:** [November 2, 2019, 12:57pm UTC](https://discuss.elastic.co/t/node-config-for-split-brain-avoidance/202386/4 "2019-11-02T12:57:36Z")

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