# How many shards are recommended 3TB index with 15 million documents?

**URL:** <https://discuss.elastic.co/t/how-many-shards-are-recommended-3tb-index-with-15-million-documents/192778>\
**Category:** Elasticsearch\
**Created:** [July 29, 2019, 9:28pm UTC](https://discuss.elastic.co/t/how-many-shards-are-recommended-3tb-index-with-15-million-documents/192778 "2019-07-29T21:28:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![praveengadugin1](https://avatars.discourse-cdn.com/v4/letter/p/858c86/32.png) [@praveengadugin1](https://discuss.elastic.co/u/praveengadugin1)\
**Post date:** [July 29, 2019, 9:28pm UTC](https://discuss.elastic.co/t/how-many-shards-are-recommended-3tb-index-with-15-million-documents/192778/1 "2019-07-29T21:28:06Z")

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I am trying reindex my old index. Present Index size is 3 TB with 18 shards for 15 million documents. What is the recommended number of shards for good performance( recovery speed, query speed, reindex speed etc)

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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:** [August 26, 2019, 9:28pm UTC](https://discuss.elastic.co/t/how-many-shards-are-recommended-3tb-index-with-15-million-documents/192778/2 "2019-08-26T21:28:12Z")

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Closed on August 26, 2019, 9:28pm UTC

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