# Elasticsearch instance hangs for a while

**URL:** <https://discuss.elastic.co/t/elasticsearch-instance-hangs-for-a-while/325442>\
**Category:** Elasticsearch\
**Created:** [February 14, 2023, 6:58am UTC](https://discuss.elastic.co/t/elasticsearch-instance-hangs-for-a-while/325442 "2023-02-14T06:58:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![taghizadeh](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/taghizadeh/32/117210_2.png) [@taghizadeh](https://discuss.elastic.co/u/taghizadeh)\
**Post date:** [February 14, 2023, 6:58am UTC](https://discuss.elastic.co/t/elasticsearch-instance-hangs-for-a-while/325442/1 "2023-02-14T06:58:13Z")

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I have an instance of elasticsearch (v8.6.1) with single node configuration.

The hardware spec is:  
RAM: 32GB  
Storage: 1TB NVME-M2  
CPU: 20 core

Currently less than 30% of storage is used and swap is off.

The problem I have is that sometimes when indexing documents, server hangs and doesn't respond. I had difficulty in communicating with server through ssh too in that period, but after some struggle, the output of atop command shows `iosome 90%` and `iofull 90%`. Also during the time that elastic does not respond, the CPU usage is below 5%, so the problem should not be relate to over CPU utilization.  
I couldn't find any solution, so any help would be appreciated.

Thanks.

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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 14, 2023, 6:58am UTC](https://discuss.elastic.co/t/elasticsearch-instance-hangs-for-a-while/325442/2 "2023-03-14T06:58:14Z")

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