# In-memory elasticsearch

**URL:** <https://discuss.elastic.co/t/in-memory-elasticsearch/151536>\
**Category:** Elasticsearch\
**Created:** [October 9, 2018, 12:19am UTC](https://discuss.elastic.co/t/in-memory-elasticsearch/151536 "2018-10-09T00:19:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Manas\_Paldhe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/manas_paldhe/32/20307_2.png) [@Manas\_Paldhe](https://discuss.elastic.co/u/Manas_Paldhe)\
**Post date:** [October 9, 2018, 12:19am UTC](https://discuss.elastic.co/t/in-memory-elasticsearch/151536/1 "2018-10-09T00:19:02Z")

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Elasticsearch 1.5 has the option of using memory storage type.  
If I understand correctly, when this option is chosen, all data will be store in the RAM?

If that is the case, why was this option removed in future versions, and if there is any equivalent?  
Also how does that compare to mmapfs?

References:  
[https://www.elastic.co/guide/en/elasticsearch/reference/1.5/index-modules-store.html](https://www.elastic.co/guide/en/elasticsearch/reference/1.5/index-modules-store.html)  
[https://www.elastic.co/guide/en/elasticsearch/reference/6.3/index-modules-store.html](https://www.elastic.co/guide/en/elasticsearch/reference/6.3/index-modules-store.html)

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**Author:** ![softwaredoug](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/softwaredoug/32/22681_2.png) [@softwaredoug](https://discuss.elastic.co/u/softwaredoug)\
**Post date:** [October 9, 2018, 12:59am UTC](https://discuss.elastic.co/t/in-memory-elasticsearch/151536/2 "2018-10-09T00:59:08Z")

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I noticed that the memory mapped file storage option is still an option (mmapfs). Is that sufficient for your needs?

-Doug

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<div class="post-metadata">

**Author:** ![Manas\_Paldhe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/manas_paldhe/32/20307_2.png) [@Manas\_Paldhe](https://discuss.elastic.co/u/Manas_Paldhe)\
**Post date:** [October 9, 2018, 1:57am UTC](https://discuss.elastic.co/t/in-memory-elasticsearch/151536/3 "2018-10-09T01:57:49Z")

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I am trying to understand the difference between the two. I unfortunately could not find detailed enough documentation about the difference.

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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:** [November 6, 2018, 2:01am UTC](https://discuss.elastic.co/t/in-memory-elasticsearch/151536/4 "2018-11-06T02:01:58Z")

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