# Elasticsearch huge buff/cache usage **URL:** https://discuss.elastic.co/t/elasticsearch-huge-buff-cache-usage/152025 **Category:** Elasticsearch **Created:** [October 11, 2018, 9:50am UTC](https://discuss.elastic.co/t/elasticsearch-huge-buff-cache-usage/152025 "2018-10-11T09:50:09Z") **Posts on this page:** 3 **Page:** 1
### Author: ![Zerobot](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/zerobot/32/48977_2.png) [@Zerobot](https://discuss.elastic.co/u/Zerobot) #### Post date: [October 11, 2018, 9:50am UTC](https://discuss.elastic.co/t/elasticsearch-huge-buff-cache-usage/152025/1 "2018-10-11T09:50:09Z")
Hello, Recently we spotted that our dedicated elasticsearch vm's with 15GB RAM each / 7GB Elasticsearch heap have a huge buff/cache usage. At somepoint it reaches almost 8GB and we have 150MB of free memory on our machine. Is that a normal situation with elasticsearch? This occurs on ingest/data nodes. Master nodes have a lot lower cache. ![image](https://us1.discourse-cdn.com/elastic/original/3X/a/d/add82d8302bacd95e2b0be1ec662bd9f2012fd05.png) ---
### Author: ![dakrone](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dakrone/32/23351_2.png) [@dakrone](https://discuss.elastic.co/u/dakrone) #### Post date: [October 11, 2018, 10:23am UTC](https://discuss.elastic.co/t/elasticsearch-huge-buff-cache-usage/152025/2 "2018-10-11T10:23:43Z")
Hi Zerobot, This is a normal Linux situation, the Linux kernel uses that RAM for the filesystem cache, see: [https://www.linuxatemyram.com/](https://www.linuxatemyram.com/) ---
### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system) #### Post date: [November 8, 2018, 10:23am UTC](https://discuss.elastic.co/t/elasticsearch-huge-buff-cache-usage/152025/3 "2018-11-08T10:23:45Z")
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