# Recommended specs for Master and Coordinating nodes in a 80TB, 8B docs cluster **URL:** \ **Category:** Elasticsearch\ **Created:** [November 13, 2018, 10:17am UTC](https://discuss.elastic.co/t/recommended-specs-for-master-and-coordinating-nodes-in-a-80tb-8b-docs-cluster/156440 "2018-11-13T10:17:18Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![JoelWes](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@JoelWes](https://discuss.elastic.co/u/JoelWes)\ **Post date:** [November 13, 2018, 10:17am UTC](https://discuss.elastic.co/t/recommended-specs-for-master-and-coordinating-nodes-in-a-80tb-8b-docs-cluster/156440/1 "2018-11-13T10:17:18Z")
We have a 21 node ES 6.3 cluster with a Hot-Warm-Cold architecture and we would like to move to have three dedicated Master nodes for this cluster and add some Coordinating nodes. As stated in the title the cluster is stable at around 80TB, because we drop older indices. We hope to mitigate some problems we've had with master election during recovery and increase search performance. Are there any recommendations of what specs these machines need? Information about current nodes: Hot: 4 nodes 48 cores 256GB memory 5TB SSD Warm: 12 nodes 48 cores 200GB memory 7TB SSD Cold: 5 nodes 40 cores 256GB memory 6TB HDD ---
**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\ **Post date:** [November 13, 2018, 10:21am UTC](https://discuss.elastic.co/t/recommended-specs-for-master-and-coordinating-nodes-in-a-80tb-8b-docs-cluster/156440/2 "2018-11-13T10:21:14Z")
Dedicated master nodes typically do not need a lot of resources. Can you provide the full output of the [cluster stats API](https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-stats.html) so we can get an idea what the cluster looks like, especially with regard to number of indices and shards in the cluster? ---
**Author:** ![JoelWes](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@JoelWes](https://discuss.elastic.co/u/JoelWes)\ **Post date:** [November 13, 2018, 10:29am UTC](https://discuss.elastic.co/t/recommended-specs-for-master-and-coordinating-nodes-in-a-80tb-8b-docs-cluster/156440/3 "2018-11-13T10:29:42Z")
Indices: 721 Shards: 7090 Cluster stats API output: [https://gist.github.com/highpie/3badfe792424a86d99582c0cf16dc937](https://gist.github.com/highpie/3badfe792424a86d99582c0cf16dc937) Any other recommendations about the current cluster are also greatly appreciated! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 11, 2018, 10:29am UTC](https://discuss.elastic.co/t/recommended-specs-for-master-and-coordinating-nodes-in-a-80tb-8b-docs-cluster/156440/4 "2018-12-11T10:29:45Z")
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