# Upgrade to Master and Data only node configuration from master-data node **URL:** \ **Category:** Elasticsearch\ **Created:** [October 2, 2019, 9:32am UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923 "2019-10-02T09:32:28Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Ilayda\_Akinalan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ilayda_akinalan/32/54058_2.png) [@Ilayda\_Akinalan](https://discuss.elastic.co/u/Ilayda_Akinalan)\ **Post date:** [October 2, 2019, 9:32am UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/1 "2019-10-02T09:32:28Z")
Currently I have 3 nodes, 330 indices and 1,822 shards and approx 3 TB of memory. Currently these 3 nodes are master-data nodes and its not coping well with the load. I was planning to keep these 3 nodes as data nodes, then have another 3 nodes and set these up as master only nodes. Considering 3 data nodes will have 1TB memory each, I was wondering if anyone could give me an idea on how much memory would each of the 3 master nodes require? ---
**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 2, 2019, 9:55am UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/2 "2019-10-02T09:55:53Z")
By "memory" I think you mean disk space, right? 1TB of RAM is a lot! Dedicated master nodes need a small amount of disk space. How many bytes is the response you get from `GET _cluster/state` in your cluster? ---
**Author:** ![Ilayda\_Akinalan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ilayda_akinalan/32/54058_2.png) [@Ilayda\_Akinalan](https://discuss.elastic.co/u/Ilayda_Akinalan)\ **Post date:** [October 2, 2019, 4:35pm UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/3 "2019-10-02T16:35:01Z")
I was hoping to use the 1TB machines as a data node, as i mentioned we index alot of data. All i would like to find out is how small does master node need to be considering we have; 411 indices 2,682 shards 3,238,297,242 docs Thanks, Ilayda ---
**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 2, 2019, 4:42pm UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/4 "2019-10-02T16:42:11Z")
This is the information we need to answer your question: > [@DavidTurner](#): > > How many bytes is the response you get from `GET _cluster/state` in your cluster? ---
**Author:** ![Ilayda\_Akinalan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ilayda_akinalan/32/54058_2.png) [@Ilayda\_Akinalan](https://discuss.elastic.co/u/Ilayda_Akinalan)\ **Post date:** [October 2, 2019, 4:56pm UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/5 "2019-10-02T16:56:09Z")
i cant seem to be able to check that via kibana due to gateway issues, however i did curl -XGET '[http://elastic1-node:9200/\_cluster/state/](http://elastic1-node:9200/_cluster/state/)' \>\> /tmp/clusterstate.txt and the bytes that correspond to the file which the results are written is: 20196970 Oct 2 12:38 clusterstate.txt So essentially 20196970 bytes. ---
**Author:** ![Ilayda\_Akinalan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ilayda_akinalan/32/54058_2.png) [@Ilayda\_Akinalan](https://discuss.elastic.co/u/Ilayda_Akinalan)\ **Post date:** [October 2, 2019, 4:59pm UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/6 "2019-10-02T16:59:52Z")
i can also provide the results of /\_cluster/stats?human&pretty' as well if you like? ---
**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 2, 2019, 5:11pm UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/7 "2019-10-02T17:11:52Z")
Ok 20MB for the cluster state, that sounds good. I would expect 1GB of space for the master's data path would be more than enough. ---
**Author:** ![Ilayda\_Akinalan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ilayda_akinalan/32/54058_2.png) [@Ilayda\_Akinalan](https://discuss.elastic.co/u/Ilayda_Akinalan)\ **Post date:** [October 4, 2019, 9:57am UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/8 "2019-10-04T09:57:50Z")
Hi David, Based on this, can you give a recommendation for CPU and RAM? (per master node) ---
**Author:** ![Ilayda\_Akinalan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ilayda_akinalan/32/54058_2.png) [@Ilayda\_Akinalan](https://discuss.elastic.co/u/Ilayda_Akinalan)\ **Post date:** [October 4, 2019, 11:14am UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/9 "2019-10-04T11:14:49Z")
also 67 MB for the cluster state not 20 - so assuming 4 GB of space perhaps? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 1, 2019, 11:15am UTC](https://discuss.elastic.co/t/upgrade-to-master-and-data-only-node-configuration-from-master-data-node/201923/10 "2019-11-01T11:15:04Z")
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