# Avoid split brain **URL:** \ **Category:** Elasticsearch\ **Created:** [October 25, 2019, 9:24am UTC](https://discuss.elastic.co/t/avoid-split-brain/205214 "2019-10-25T09:24:53Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![elk2](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@elk2](https://discuss.elastic.co/u/elk2)\ **Post date:** [October 25, 2019, 9:24am UTC](https://discuss.elastic.co/t/avoid-split-brain/205214/1 "2019-10-25T09:24:53Z")
I have a cluster with 5 nodes master+data: 2 nodes are into site A and 3 nodes are into site B. There is a possiblity that link from A to B can go down. How can I configure discovery.zen.minimum\_master\_nodes ? ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [October 25, 2019, 9:44am UTC](https://discuss.elastic.co/t/avoid-split-brain/205214/2 "2019-10-25T09:44:20Z")
> [@elk2](#): > > How can I configure discovery.zen.minimum\_master\_nodes ? You have five master-eligible nodes so you must set `discovery.zen.minimum_master_nodes: 3`. ---
**Author:** ![elk2](https://avatars.discourse-cdn.com/v4/letter/e/f14d63/32.png) [@elk2](https://discuss.elastic.co/u/elk2)\ **Post date:** [October 25, 2019, 1:17pm UTC](https://discuss.elastic.co/t/avoid-split-brain/205214/3 "2019-10-25T13:17:02Z")
Thanks David. But if the link from site A and B go down, site B has 3 master nodes. Do we have split brain? ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [October 25, 2019, 3:22pm UTC](https://discuss.elastic.co/t/avoid-split-brain/205214/4 "2019-10-25T15:22:28Z")
No, if the sites are disconnected then site A will fail and site B will continue without it. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 22, 2019, 3:22pm UTC](https://discuss.elastic.co/t/avoid-split-brain/205214/5 "2019-11-22T15:22:28Z")
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