# Why data save to master cluster?

**URL:** <https://discuss.elastic.co/t/why-data-save-to-master-cluster/325576>\
**Category:** Elasticsearch\
**Created:** [February 15, 2023, 9:40am UTC](https://discuss.elastic.co/t/why-data-save-to-master-cluster/325576 "2023-02-15T09:40:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![fered](https://avatars.discourse-cdn.com/v4/letter/f/e19b73/32.png) [@fered](https://discuss.elastic.co/u/fered)\
**Post date:** [February 15, 2023, 9:40am UTC](https://discuss.elastic.co/t/why-data-save-to-master-cluster/325576/1 "2023-02-15T09:40:59Z")

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I have a cluster that it have 3 master and 4 data node(2 hot , 1 warm , 1 cold).  
so i configure ILM for this cluster , but I dont know why index(primery & replica) save in master node ?

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [February 15, 2023, 9:33pm UTC](https://discuss.elastic.co/t/why-data-save-to-master-cluster/325576/2 "2023-02-15T21:33:24Z")

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Welcome to our community! 😃

Are they master only nodes, or are they data and master?

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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:** [March 15, 2023, 9:33pm UTC](https://discuss.elastic.co/t/why-data-save-to-master-cluster/325576/3 "2023-03-15T21:33:50Z")

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