# Elastic search 2.4 performance issue on VM (openstack)

**URL:** <https://discuss.elastic.co/t/elastic-search-2-4-performance-issue-on-vm-openstack/183671>\
**Category:** Elasticsearch\
**Created:** [May 31, 2019, 7:20am UTC](https://discuss.elastic.co/t/elastic-search-2-4-performance-issue-on-vm-openstack/183671 "2019-05-31T07:20:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![madhur2928](https://avatars.discourse-cdn.com/v4/letter/m/f1d935/32.png) [@madhur2928](https://discuss.elastic.co/u/madhur2928)\
**Post date:** [May 31, 2019, 7:20am UTC](https://discuss.elastic.co/t/elastic-search-2-4-performance-issue-on-vm-openstack/183671/1 "2019-05-31T07:20:35Z")

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Hi,

We have an elastic cluster(2.4) with around 18T data (with replica) running on 10 nodes.  
Recently we moved 2 of our servers to VM using openstack but started facing issues on both of the VM's intermittently.

Issues:

- Intermittently cpu load becomes high on VM machines.
- Search latency starts increasing
- after few minutes load comes back to normal and node starts behaving fine
- nothing unusual in marvel and elastic logs

Issues are coming only on VM nodes which is also intermittent whereas physical machine nodes are working absolutely fine.

We have also restarted/rebalanced the cluster but still issue persist.

Also, VM's which we are running have better configuration then physical machines with only 1 VM per 1 physical machine.

Anyone faced the same issue or can suggest any pointer.

Thanks,  
Madhur

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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:** [June 28, 2019, 7:20am UTC](https://discuss.elastic.co/t/elastic-search-2-4-performance-issue-on-vm-openstack/183671/2 "2019-06-28T07:20:35Z")

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