# Is it possible to move .fdt file, to external disk? **URL:** \ **Category:** Elasticsearch\ **Created:** [February 5, 2019, 2:08pm UTC](https://discuss.elastic.co/t/is-it-possible-to-move-fdt-file-to-external-disk/167139 "2019-02-05T14:08:14Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![JF2018](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@JF2018](https://discuss.elastic.co/u/JF2018)\ **Post date:** [February 5, 2019, 2:08pm UTC](https://discuss.elastic.co/t/is-it-possible-to-move-fdt-file-to-external-disk/167139/1 "2019-02-05T14:08:15Z")
Hi 70-80% of the storage use for my indices are the Stored Fields. - that is, the .fdt files. I am running in the cloud, and this becomes expensive, since I need quite large machines to contain the indices. The total size of the indices are ~15-20TB. Therefore I think about moving the stored fields onto a cheaper disk. I am aware, that this will make queries slower, but is it possible to do in an elegant and easy way? **Ie. by setting a pointer to the .fdt files position, somewhere in the settings?** I am running es 1.7.5, and I am aware that it would be preferable to upgrade it, but it is currently not a possibility What I am looking for, is probably elastics implementation of this lucene feature: [https://lucene.apache.org/core/4\_6\_0/core/org/apache/lucene/store/FileSwitchDirectory.html](https://lucene.apache.org/core/4_6_0/core/org/apache/lucene/store/FileSwitchDirectory.html) ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [February 5, 2019, 2:22pm UTC](https://discuss.elastic.co/t/is-it-possible-to-move-fdt-file-to-external-disk/167139/2 "2019-02-05T14:22:30Z")
No, Elasticsearch does not support splitting a segment across multiple locations like this. If you are content with slower queries, why not put everything on the cheaper disk? ---
**Author:** ![JF2018](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@JF2018](https://discuss.elastic.co/u/JF2018)\ **Post date:** [February 5, 2019, 2:55pm UTC](https://discuss.elastic.co/t/is-it-possible-to-move-fdt-file-to-external-disk/167139/3 "2019-02-05T14:55:33Z")
Because I would expect the performance penalty, would be significantly less if I can keep the indices on the faster disks, and only move the stored fields to the cheaper slower disk. The stored fields are - as far as I know - only used, when returning hits, and thus it would only be for the i.e. top 10 hits I return, it has to go to the slower disc. And since the stored fields is such a large percentage of the storage use, I think that would be a nice compromise. ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [February 5, 2019, 3:26pm UTC](https://discuss.elastic.co/t/is-it-possible-to-move-fdt-file-to-external-disk/167139/4 "2019-02-05T15:26:37Z")
I see. It's an interesting idea, and I don't know if the Elasticsearch team have previously discussed using something like a `FileSwitchDirectory` in this manner. I suspect it'd be a bit of a pain to manage. It seems like a reasonable feature to request, so could you open a Github issue with this idea for wider discussion within the team? ---
**Author:** ![JF2018](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@JF2018](https://discuss.elastic.co/u/JF2018)\ **Post date:** [February 8, 2019, 11:39am UTC](https://discuss.elastic.co/t/is-it-possible-to-move-fdt-file-to-external-disk/167139/5 "2019-02-08T11:39:38Z")
Yeah sure, I have create the issue here: `https://github.com/elastic/elasticsearch/issues/38612` Please feel free to tell me, if it is the wrong place 🙂 ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [March 8, 2019, 11:39am UTC](https://discuss.elastic.co/t/is-it-possible-to-move-fdt-file-to-external-disk/167139/6 "2019-03-08T11:39:48Z")
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