# Reindex API - Extremely Slow

**URL:** <https://discuss.elastic.co/t/reindex-api-extremely-slow/168670>\
**Category:** Elasticsearch\
**Created:** [February 16, 2019, 7:11am UTC](https://discuss.elastic.co/t/reindex-api-extremely-slow/168670 "2019-02-16T07:11:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![myspacebarisbroken](https://avatars.discourse-cdn.com/v4/letter/m/e9a140/32.png) [@myspacebarisbroken](https://discuss.elastic.co/u/myspacebarisbroken)\
**Post date:** [February 16, 2019, 7:11am UTC](https://discuss.elastic.co/t/reindex-api-extremely-slow/168670/1 "2019-02-16T07:11:38Z")

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Hi!

My ES Server has 1.4TB of data (6B documents). Reindex API (increasing shard count) is taking forever, in 12 hours it's only done 40GB. Is there anything i can do to speed things up?

Things i've done:  
Set refresh interval to -1 (After reindex started)  
Current buffer size is 10% (31GB RAM = 3.1GB)

The server is 4tb SSD, 64GB RAM, Intel i7-7700K

Anything i can do to speed this up?

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [February 16, 2019, 8:19am UTC](https://discuss.elastic.co/t/reindex-api-extremely-slow/168670/2 "2019-02-16T08:19:44Z")

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You have only one node? How many shards for the new index?

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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:** [March 16, 2019, 8:19am UTC](https://discuss.elastic.co/t/reindex-api-extremely-slow/168670/3 "2019-03-16T08:19:46Z")

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