# Elasticsearch from single node to cluster

**URL:** <https://discuss.elastic.co/t/elasticsearch-from-single-node-to-cluster/209821>\
**Category:** Elasticsearch\
**Created:** [November 28, 2019, 9:51am UTC](https://discuss.elastic.co/t/elasticsearch-from-single-node-to-cluster/209821 "2019-11-28T09:51:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mycloudcms](https://avatars.discourse-cdn.com/v4/letter/m/3be4f8/32.png) [@mycloudcms](https://discuss.elastic.co/u/mycloudcms)\
**Post date:** [November 28, 2019, 9:51am UTC](https://discuss.elastic.co/t/elasticsearch-from-single-node-to-cluster/209821/1 "2019-11-28T09:51:30Z")

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Hi, I plan to upgrade our ELK setup, where from single server will migrate to new cluster. I plan a 3 server setup for Elastic and have some questions if you could help.

1. As data will be shared across 3 servers, will be better to have RAID 0 or RAID 1?
2. SSD or NVME
3. How to convert single node to cluster for existing ES data?

Thank you.

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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:** [December 26, 2019, 9:51am UTC](https://discuss.elastic.co/t/elasticsearch-from-single-node-to-cluster/209821/2 "2019-12-26T09:51:32Z")

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