# Elastic search RAM size

**URL:** <https://discuss.elastic.co/t/elastic-search-ram-size/126423>\
**Category:** Elasticsearch\
**Created:** [April 2, 2018, 12:22pm UTC](https://discuss.elastic.co/t/elastic-search-ram-size/126423 "2018-04-02T12:22:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Deepak\_Mehta1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/deepak_mehta1/32/94163_2.png) [@Deepak\_Mehta1](https://discuss.elastic.co/u/Deepak_Mehta1)\
**Post date:** [April 2, 2018, 12:22pm UTC](https://discuss.elastic.co/t/elastic-search-ram-size/126423/1 "2018-04-02T12:22:21Z")

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Hello,

We have ES 2.4 version cluster with 18TB of data (primary + 2 replicas). We have around 12 data nodes with 3TB of disk and 60 GB of RAM ( 30G Heap).

We have around 100 indices of around 30 GB of size.

Our search response time is very high (average 4 sec). Queries are not cached as we don't get very frequent search.

Would increasing File system cache by adding more RAM, say around 150GB would help in search performance?

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**Author:** ![ddorian43](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ddorian43/32/36093_2.png) [@ddorian43](https://discuss.elastic.co/u/ddorian43)\
**Post date:** [April 3, 2018, 2:23pm UTC](https://discuss.elastic.co/t/elastic-search-ram-size/126423/2 "2018-04-03T14:23:53Z")

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Yes, but depends by how much on where your bottleneck is (cpu, ram, disk, network).

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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:** [May 1, 2018, 2:24pm UTC](https://discuss.elastic.co/t/elastic-search-ram-size/126423/3 "2018-05-01T14:24:09Z")

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