# Indexing rate drops periodically - performance troubleshooting

**URL:** <https://discuss.elastic.co/t/indexing-rate-drops-periodically-performance-troubleshooting/252832>\
**Category:** Elasticsearch\
**Created:** [October 21, 2020, 11:36am UTC](https://discuss.elastic.co/t/indexing-rate-drops-periodically-performance-troubleshooting/252832 "2020-10-21T11:36:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Petr.Simik](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/petr.simik/32/38082_2.png) [@Petr.Simik](https://discuss.elastic.co/u/Petr.Simik)\
**Post date:** [October 21, 2020, 11:36am UTC](https://discuss.elastic.co/t/indexing-rate-drops-periodically-performance-troubleshooting/252832/1 "2020-10-21T11:36:30Z")

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I have a ES 7.9.2, [10node cluster each: 4Core, 32G RAM, 500GB SSD]  
I tried performance test on index , 5 primary shards, 0 replica.  
It reaches around 200K events/sec  
and I found weird performance drops. Can you help me how to troubleshoot performance drops.  
Where should I look to determine the potential cause of the issue?

thank you

See kibana indexing rate on test index

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/a/3/a31a5dee2ef389d1a24257c6cfbdd75dbb5b7ed4.png)

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/6/3/638e46455acda64a43233b6cabbee6bf961e1e7a.png)

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [October 21, 2020, 12:17pm UTC](https://discuss.elastic.co/t/indexing-rate-drops-periodically-performance-troubleshooting/252832/2 "2020-10-21T12:17:33Z")

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If you have 5 primary shards and no replica shards, only 5 data nodes will be processing indexing requests for this index. The periodicity in performance drops could very well be due to merging. Are you monitoring disk I/O and iowait on the data nodes? Is there anything in the Elasticsearch logs around these dips?

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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 18, 2020, 12:17pm UTC](https://discuss.elastic.co/t/indexing-rate-drops-periodically-performance-troubleshooting/252832/3 "2020-11-18T12:17:34Z")

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