# What does index.store.fs do?
**URL:** https://discuss.elastic.co/t/what-does-index-store-fs-do/11471
**Category:** Elasticsearch
**Created:** [April 6, 2013, 7:37am UTC](https://discuss.elastic.co/t/what-does-index-store-fs-do/11471 "2013-04-06T07:37:31Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@concept47](https://discuss.elastic.co/u/concept47)
#### Post date: [April 6, 2013, 7:37am UTC](https://discuss.elastic.co/t/what-does-index-store-fs-do/11471/1 "2013-04-06T07:37:31Z")
I was under the impression that to use the mmapfs store that all I needed
to do was set index.store.type to mmapfs
, but I was reading this article
[http://jprante.github.io/applications/2012/07/26/Mmap-with-Lucene.html](http://jprante.github.io/applications/2012/07/26/Mmap-with-Lucene.html)and
saw that the author did this
index:
store:
type: mmapfs
fs:
mmapfs:
enabled: true
so he basically did what I did then set
index.store.fs.mmapfs to true
My question is what does this do?
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### Author:  [@simonw\_2](https://discuss.elastic.co/u/simonw_2)
#### Post date: [April 6, 2013, 6:40pm UTC](https://discuss.elastic.co/t/what-does-index-store-fs-do/11471/2 "2013-04-06T18:40:58Z")
setting
index.store.type: mmapfs
is enough to use MMap directory.
I don't know what the yaml below does aside of setting mmapfs
simon
On Saturday, April 6, 2013 9:37:31 AM UTC+2, concept47 wrote:
> I was under the impression that to use the mmapfs store that all I needed
> to do was set index.store.type to mmapfs
> , but I was reading this article
> [http://jprante.github.io/applications/2012/07/26/Mmap-with-Lucene.html](http://jprante.github.io/applications/2012/07/26/Mmap-with-Lucene.html)and
> saw that the author did this
>
> index:
> store:
> type: mmapfs
> fs:
> mmapfs:
> enabled: true
>
> so he basically did what I did then set
> index.store.fs.mmapfs to true
>
> My question is what does this do?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 2:42am UTC](https://discuss.elastic.co/t/what-does-index-store-fs-do/11471/3 "2017-07-06T02:42:28Z")